MEP QuickDesign
Smart, Fast MEP Design Calculations & Engineering Tools
100+ Calculators & Tools by Augmintech
100+ Calculators & Tools by Augmintech
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ASHRAE · SMACNA · IPC · NFPA
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Modules
HVAC
8 calculators
Plumbing
5 calculators
Fire Fighting
5 calculators
Electrical
12 calculators
Tools
Converter · Rules · Standards
Recent Calculations
Psychrometric Calculator
ASHRAE Fundamentals 2021 - Hyland-Wexler Equations
Calculate complete psychrometric state of moist air from two known properties. Uses full ASHRAE Hyland-Wexler saturation pressure equations - not approximations.
Inputs
Dry Bulb Temperature °F
Known Second Parameter
Rel. Humidity
Wet Bulb
Dew Point
Hum. Ratio
Relative Humidity %
Atmospheric Pressure kPa
Duct Sizer + Friction Loss
SMACNA HVAC Duct Design Manual - Equal Friction Method
Size round or rectangular ducts for a target friction rate using the Equal Friction Method with Colebrook-White friction factor iteration (SMACNA).
Inputs
Airflow (Q) CFM
Target Friction Rate in w.g./100 ft
Duct Shape
Round
Rectangular
Pump Head Calculator
Darcy-Weisbach + ASHRAE Equivalent Length Method
Calculate total system head for HVAC water systems. Includes pipe friction, fittings (equivalent length method), static head, and equipment losses.
System Parameters
Flow Rate (Q) GPM
Nominal Pipe Size
Pipe Material
Carbon Steel
Copper
Galv. Steel
Total Pipe Length ft
Fluid Temperature °F
Fittings & Valves
Head Components
Static Head (elevation diff) ft
Equipment Losses ft w.g.
Safety Factor %
Pipe Sizer - CHW / CW
ASHRAE / SMACNA - Velocity & Pressure Drop Method
Size chilled water or condenser water pipes. Iterates through Sch 40 sizes to find the smallest meeting target ΔP. Glycol viscosity correction included.
Inputs
Flow Rate GPM
Fluid Type
Fluid Temperature °F
Pipe Material
Target ΔP ft w.g./100ft
Ventilation + ACH Calculator
ASHRAE 62.1-2019 Ventilation Rate Procedure / ACH method
Calculate required outdoor air using ASHRAE 62.1 Ventilation Rate Procedure or the simplified ACH method. ASHRAE 62.1 values are minimum rates.
Method
ASHRAE 62.1
ACH Method
Inputs
Space Type
Floor Area ft²
Ceiling Height ft
Occupant Count
Domestic Water Demand
Hunter's Method - IPC Table 604.1
Estimate peak domestic water demand using Hunter's Method fixture unit approach per IPC. Enter fixture counts to calculate design peak flow.
Building Type
Residential
Commercial
Fixture Counts
Drainage Sizing
IPC Table 702.1 - Drainage Fixture Unit Method
Size drainage pipes based on drainage fixture units (DFU) per IPC. Select system type and enter fixture counts.
System Type
Horizontal Branch
Stack
Building Drain
Fixture Counts
Tank Sizing
Storage Demand Method
Calculate required water storage tank capacity based on daily demand, peak flow, and storage duration.
Inputs
Daily Water Demand gal
Storage Duration days
Peak Flow Rate GPM
Pump Fill Rate GPM
Sprinkler K-Factor Calculator
NFPA 13 - Q = K × √P
Calculate sprinkler discharge flow from pressure, or required pressure for target flow. Uses NFPA 13 standard K-factor values only.
Solve For
Flow (Q)
Pressure (P)
Inputs
K-Factor (NFPA 13) GPM/√psi
Pressure (P) psi
Flow & Pressure - Hazen-Williams
NFPA 13 - hf = 4.52 × L × Q^1.85 / (C^1.85 × d^4.87)
Calculate friction loss in fire protection piping using Hazen-Williams equation. Valid for turbulent water flow in clean pipes.
Inputs
Flow Rate (Q) GPM
Pipe Size NPS
Pipe Material (C-factor)
Pipe Length ft
Fire Pump Duty Point
NFPA 20 - Pump Performance Requirements
Calculate fire pump rated duty, churn pressure, and peak flow point per NFPA 20 requirements. Motor power estimate included.
System Demand
System Demand Flow GPM
System Demand Pressure psi
Suction Head (tank to pump) ft
Discharge Pipe Losses psi
Pump + Motor Efficiency %
Fire Tank Capacity
NFPA 22 - Water Tanks for Private Fire Protection
Calculate required fire water tank capacity including sprinkler demand, standpipe demand, and hose stream allowance per NFPA 22.
System Type
Combined
Sprinkler Only
Standpipe Only
Demand Inputs
Sprinkler Demand GPM
Sprinkler Duration min
Standpipe Demand GPM
Standpipe Duration min
Hose Stream Allowance GPM
Hose Stream Duration min
Makeup Supply GPM (0 = none)
Unit Converter
Engineering units - all MEP disciplines
Value to Convert
From
To
Heat Load Quick Calculator
Simplified method - schematic design estimate only
⚠ QUICK ESTIMATE ONLY. This is NOT an ASHRAE Manual J / CLTD full load calculation. Use only for preliminary sizing. Always perform a full load calculation before equipment selection.
Space Geometry
Floor Area ft²
Ceiling Height ft
Glazing Area ft²
Glazing Orientation
Glass SHGC
Wall / Roof U-value BTU/hr·ft²·°F
Internal Loads & Design Conditions
Occupants
Activity Level
Lighting W/ft²
Equipment / Plug Loads W/ft²
Outdoor Design DBT °F
Indoor Setpoint °F
Outdoor Humidity Ratio gr/lb
Indoor Humidity Ratio gr/lb
External Static Pressure (ESP)
AHU / FCU fan selection - total external static pressure
Calculate total external static pressure available to the duct distribution system. Each component loss is entered separately for a clear breakdown.
Supply Side Losses
Supply Duct System in w.g.
Supply Diffusers / Grilles in w.g.
Return Side Losses
Return Duct System in w.g.
Return Grilles / Louvres in w.g.
AHU Internal Components
Cooling Coil (dirty) in w.g.
Filter - Clean in w.g.
Filter - Dirty (design condition) in w.g.
Mixing Box / OA Damper in w.g.
Accessories (humidifier, attenuator, etc.) in w.g.
Diffuser Quick Selector
Based on typical manufacturer performance - not a substitute for manufacturer software
Select diffuser type and estimate neck size, throw, and noise criterion for a given airflow. Results are based on typical published performance data.
Room & Airflow Inputs
Room Airflow CFM
Number of Diffusers in Room
Ceiling Height ft
Diffuser Type
Water Supply Pipe Sizer
IPC / ASPE - Velocity & Pressure adequacy method
Size domestic water supply pipes and verify residual pressure at the most remote fixture. Uses Hazen-Williams with elevation and fitting allowances.
System Inputs
Design Flow Rate GPM
Available Supply Pressure psi
Required Residual at Fixture psi
Total Pipe Length ft
Fitting Allowance % of pipe length
Elevation Rise (supply to fixture) ft
Pipe Material
Transfer / Booster Pump
Head + flow duty calculation - Darcy-Weisbach
Calculate booster or transfer pump duty for domestic water systems. Includes suction head, delivery head, and pipe losses using Darcy-Weisbach.
System Parameters
Design Flow Rate GPM
Suction Water Level (below pump) ft
Delivery Height (pump to highest point) ft
Required Residual Pressure at Top psi
Total Pipe Length (supply + return) ft
Pipe Size NPS in
Pump + Motor Efficiency %
Safety Factor %
Hot Water System Calculator
Demand · Heater capacity · Storage · Recovery time
Size hot water heaters and storage tanks for residential, hotel, hospital, and commercial applications. Based on daily demand and peak draw patterns.
Occupancy & Demand
Building type
Number of persons / beds / covers
Peak draw factor fraction of daily in peak hour
Temperature & Heater
Cold water inlet temp °C
Hot water supply temp °C
Heater efficiency %
Storage as % of daily demand %
Pressure at Fixture
Residual pressure check - IPC / ASPE basis
Verify that adequate residual pressure exists at the most remote / critical fixture. Accounts for elevation, pipe friction, and fitting losses.
System Inputs
Available supply pressure psi
Elevation of fixture above supply ft
Pipe friction loss psi
Fitting / valve losses psi
Meter / PRV / backflow loss psi
Fixture type (minimum required)
Pipe Design Check Tool
Velocity · pressure drop · sizing - design assistant
Enter your pipe system design values and get instant engineering feedback. Flags excessive velocity, undersized pipes, low pressure, and poor flow conditions.
Supply System Parameters
Cold water pipe velocity fps
Hot water pipe velocity fps
Residual pressure at critical fixture psi
Maximum supply pressure psi
Drainage Parameters
Horizontal drain pipe velocity fps
Drain pipe slope in/ft
Pipe fill ratio % of diameter
Fixture Unit Smart Calculator
IPC Table 604.1 - FU to probable flow conversion
Select fixtures, get automatic FU assignment per IPC, and convert to probable peak design flow using Hunter's curve. Faster and less error-prone than manual lookups.
Building Type
Residential / Private
Commercial / Public
Fixture Quantities
Gravity Flow Check
Manning's equation - partial flow in circular pipes
Verify gravity drainage pipe performance using Manning's equation. Checks that velocity and fill ratio are within acceptable limits for self-cleansing flow.
Pipe & Flow Inputs
Pipe internal diameter in
Pipe slope in/ft
Manning's n (pipe material)
Design flow rate GPM
Sewage Pump Sizing
Submersible / ejector pump - sump volume + cycle time
Size sewage ejector or submersible sump pump for basement or low-level drainage. Calculates required pump capacity, sump volume, and cycle time.
Flow & Sump Inputs
Peak sewage inflow rate GPM
Desired pump cycle time minutes
Minimum starts per hour max
Static lift (invert to discharge) ft
Friction head in discharge pipe ft
Safety factor %
Rainwater Drainage Calculator
Roof drainage - BS EN 12056 / IPC basis
Calculate stormwater runoff from roof and paved areas, size downpipes, and verify drain capacity based on design rainfall intensity.
Roof & Rainfall Data
Roof / catchment area ft²
Rainfall intensity in/hr
Runoff coefficient (C)
Number of downpipes / roof drains
Grey Water / Reuse Calculator
Generation estimate · reuse potential · demand matching
Estimate grey water generation from showers, basins, and laundry; compare against reuse demand (toilet flushing, irrigation). Supports sustainable water design.
Grey Water Generation
Number of occupants
Shower / bath use L/person/day
Washbasin use L/person/day
Laundry L/person/day
Grey water treatment efficiency %
Reuse Demand
WC flushing demand L/person/day
Irrigation demand L/day
Standpipe Friction Loss
NFPA 14 - Hazen-Williams pipe loss calculation
Calculate pressure losses in a standpipe riser and verify residual pressure at the most remote / topmost hose connection per NFPA 14.
Standpipe Class & Configuration
Standpipe Class
Hose Connections Flowing Simultaneously
Flow per Connection GPM
Riser Geometry
Riser Height (pump to top hose valve) ft
Riser Pipe Size NPS in (ID)
Horizontal Run Length ft
Number of 90° Elbows in Riser
Hazen-Williams C-factor
Pump Discharge Pressure psi
Airflow Calculator
CFM from TR · Sensible heat · Delta-T method
Calculate required supply airflow from cooling capacity, sensible load, or temperature difference. Three independent methods - use whichever data you have.
Method 1 - From Cooling Capacity (TR)
Cooling capacity TR
CFM per TR factor CFM/TR
Typical: 350–450 CFM/TR. Use 400 for office, 450 for high-latent spaces.
Method 2 - From Sensible Heat Load
Sensible heat load BTU/hr
Room temp (T_room) °F
Supply air temp (T_supply) °F
Method 3 - From ΔT + Airflow (reverse)
Known airflow CFM
ΔT (room − supply) °F
Cooling Coil Calculator
Coil load · SHR · ADP · Bypass factor - simplified
Calculate cooling coil performance from entering and leaving air conditions. Simplified psychrometric coil analysis. Not a substitute for full coil selection software.
Entering Air Conditions (EAC)
Entering DBT °F
Entering WBT °F
Leaving Air Conditions (LAC)
Leaving DBT °F
Leaving WBT °F
Airflow
Supply airflow CFM
Fan Power Calculator
Fluid power + shaft power + motor sizing
Calculate fan shaft power from airflow and total static pressure, accounting for fan and motor efficiencies.
Inputs
Airflow (Q) CFM
Total static pressure in w.g.
Fan total efficiency %
Motor efficiency %
Drive transmission efficiency %
Direct drive: 100% · Belt drive: 95–98%
Fan Laws Calculator
Affinity laws - speed change effect on flow, pressure, power
Apply fan affinity laws for VFD speed changes. Flow ∝ N, Pressure ∝ N², Power ∝ N³. Essential for energy optimisation and VAV system design.
Original Operating Point
Original airflow (Q₁) CFM
Original static pressure (P₁) in w.g.
Original fan power (W₁) kW
New Speed
New speed as % of original %
VFD turndown: typically 40–100% of design speed
Fresh Air Requirement
ASHRAE 62.1 - people + area components
Calculate minimum outdoor air requirement from occupancy and floor area. Combines people-based and area-based components per ASHRAE 62.1 Ventilation Rate Procedure.
Space Details
Space type
Floor area ft²
Design occupancy people
Number of zones / AHUs
Ez - Zone air distribution effectiveness
AHU Supply Air Temperature
SAT from sensible load + airflow - bidirectional
Calculate required supply air temperature from room load and airflow, or required airflow from SAT and load. Useful for AHU design and troubleshooting.
Known Inputs
Solve for
Supply Air Temp (SAT)
Required Airflow (CFM)
Room sensible load BTU/hr
Room setpoint temperature °F
Supply airflow CFM
Chiller COP / Efficiency
COP · kW/TR · IPLV basis
Calculate chiller coefficient of performance and specific energy consumption. Compare against industry benchmarks for efficiency rating.
Inputs
Cooling load delivered TR
Compressor power input kW
CHW supply temperature °F
CHW return temperature °F
CW inlet temperature °F
Cooling Tower Calculator
Heat rejection · Range · Approach - simplified
Estimate cooling tower water flow and capacity from heat rejection load, range, and approach. Simplified model - not a full tower simulation.
Inputs
Heat rejection load TR
CW inlet to tower (hot) °F
CW outlet from tower (cold) °F
Ambient wet bulb temperature °F
Cycles of concentration (CoC)
Typical: 3–6 cycles depending on water quality
Refrigerant Pipe Sizing
Velocity-based estimation - suction / liquid / discharge lines
Estimation tool only. Based on recommended velocity ranges. Always verify with refrigerant-specific pressure drop calculations and manufacturer data. Not a substitute for full refrigerant system design.
Inputs
Cooling capacity TR
Refrigerant type
Line type
Suction
Liquid
Discharge
Condensate Drain Sizing
Condensate flow rate · Pipe size · Slope
Estimate condensate generation rate from latent cooling load and determine appropriate drain pipe size and slope.
Inputs
Input method
From TR (cooling capacity)
From latent load
Cooling capacity TR
Number of AHU / FCU units
Drain length ft
🔍 Design Sanity Check
Design Assistant - velocity · friction · airflow · pressure checks
Enter your system design values and get instant engineering feedback. Acts as a second opinion on your HVAC design parameters.
Duct System
Supply main duct velocity FPM
Duct friction rate in w.g./100ft
Total External Static Pressure in w.g.
Pipe System
CHW main pipe velocity fps
Pump total head ft w.g.
Air & Load
Airflow per TR CFM/TR
Supply air temperature °F
CHW ΔT (supply to return) °F
Chiller kW/TR
Air Mixing Calculator
Multi-stream mixing - psychrometric basis
Calculate mixed air conditions when two airstreams (e.g. return air + outdoor air) are combined. Uses mass balance and energy balance per ASHRAE Fundamentals.
Stream 1 - Return / Primary Air
Airflow CFM
Dry bulb temp °F
Relative humidity %
Stream 2 - Outdoor / Secondary Air
Airflow CFM
Dry bulb temp °F
Relative humidity %
Room Pressurization Calculator
Supply vs return/exhaust balance - Pa differential
Determine required supply/exhaust airflow imbalance to maintain a target room pressure differential. Used for clean rooms, hospitals, labs, and odour containment.
Room & Leakage Inputs
Target pressure differential Pa
Room type / target
Room door gap area cm²
Wall leakage area (all surfaces) cm²
Room supply airflow CFM
Equipment Heat Gain
Internal heat gain - ASHRAE Fundamentals basis
Estimate sensible heat gain from electrical equipment, computers, servers, and appliances for cooling load calculations. Based on nameplate power and usage factors.
Equipment Inputs
Computers / workstations
Monitors
Printers / copiers
Servers / UPS
Other equipment W total
Usage / diversity factor 0.5–1.0
Radiant fraction typ 0.3–0.5
Heating Load Calculator
Simplified winter heat loss - envelope + infiltration
Estimate building heating load for boiler, AHU heating coil, or electric heater sizing. Covers envelope conduction and infiltration losses. Simplified - not a full Manual J/EN 12831 calculation.
Space & Envelope
Floor area ft²
Ceiling height ft
Wall + roof U-value BTU/hr·ft²·°F
Glazing area ft²
Glazing U-value BTU/hr·ft²·°F
Outdoor design temperature °F
Indoor setpoint °F
Infiltration (ACH) air changes/hr
Insulation Thickness Estimator
Pipe & duct insulation - heat loss / anti-condensation
Estimate minimum insulation thickness for pipes and ducts to limit heat loss or prevent condensation. Based on steady-state cylindrical heat transfer (pipes) or flat wall (ducts).
System Type & Conditions
Application
Fluid / air temperature °F
Ambient temperature °F
Ambient relative humidity %
Pipe outer diameter / duct perimeter mm
Insulation thermal conductivity (k) W/m·K
ACH Recommendation Tool
ASHRAE 62.1 / HTM / CIBSE reference levels
Quick reference for recommended air change rates (ACH) by space type. Use as input for Ventilation + ACH calculator or to validate existing system design.
Space Selection
Building type
Space type
Room volume ft³
Sprinkler Density & Flow
NFPA 13 - design density method
Calculate sprinkler flow requirement from design density and coverage area. NFPA 13 density/area method - preliminary sizing only, not full hydraulic network analysis.
Hazard Classification
Hazard category (NFPA 13)
Coverage area per sprinkler ft²
Sprinkler K-factor GPM/√psi
Sprinkler Spacing Calculator
NFPA 13 - maximum spacing & coverage limits
Determine maximum sprinkler spacing and coverage area limits based on hazard classification and construction type per NFPA 13.
System Parameters
Hazard / occupancy
Construction type
Room dimensions ft × ft
Sprinkler type
Equivalent Length Calculator
Fitting losses as equivalent pipe length - NFPA 13 basis
Convert pipe fittings and valves to equivalent lengths of straight pipe for use in Hazen-Williams friction loss calculations.
Pipe Size
Nominal pipe size NPS inches
Fitting Quantities
Pipe Run
Actual pipe length ft
Fire Water Demand Calculator
Simultaneous demand - sprinkler + hydrant + hose reel
Calculate total fire water demand for pump and tank sizing. Combines sprinkler demand, hydrant flow, and hose reel flow per simultaneous operation requirements.
Sprinkler Demand
Sprinkler system flow GPM
Sprinkler residual pressure required psi
Hydrant Demand (external)
Number of simultaneous hydrants
Flow per hydrant GPM
Hose Reel Demand
Number of simultaneous hose reels
Flow per hose reel GPM
Fire Pipe Design Check
Velocity · friction · pressure - design assistant
Enter fire protection pipe design values and get instant engineering feedback on velocity, friction loss, and pressure adequacy per NFPA 13/14/20 guidelines.
Pipe System Parameters
Pipe velocity fps
Friction loss per foot psi/ft
Residual pressure at remote head psi
Pump discharge pressure psi
Max system pressure (churn) psi
Pump Suction / NPSH Check
NPSH available - cavitation prevention - simplified
Simplified NPSH estimation. Actual NPSH required (NPSHr) must be obtained from the pump manufacturer's performance curve. This tool estimates NPSH available (NPSHa) to verify margin.
Suction Conditions
Suction source type
Suction head / lift ft (+ve = flooded, −ve = lift)
Suction pipe friction loss ft
Water temperature °F
Site elevation ft above sea level
Pump manufacturer NPSHr ft
Tank Duration / Refill Calculator
NFPA 22 - duration validation & refill time
Validate fire water tank capacity against required duration, and estimate refill time from mains supply. Cross-checks against NFPA 22 basis.
Demand & Duration
Total fire water demand GPM
Required duration minutes
Actual tank capacity gal
Refill Conditions
Mains refill rate GPM
Hose Reel / Hydrant Coverage
Coverage radius · area · outlet count
Calculate effective coverage area for hose reels and hydrants, and determine the minimum number of outlets required to cover a floor area.
Outlet Parameters
Type
Hose Reel
Hose-down Hydrant
Monitor / Deluge
Hose length ft
Effective reach beyond hose end ft
Floor / protection area ft²
Obstruction factor 0.5 = heavy obstacles, 1.0 = open
Pipe Thermal Expansion
ΔL = α × L × ΔT - loop sizing basis
Calculate thermal expansion of pipes due to temperature change. Used to size expansion loops, offsets, and bellows in hot/chilled water and steam systems.
Pipe & Temperature Inputs
Pipe material
Pipe run length m
Installation temperature °C
Operating temperature °C
Water Hammer (Surge Pressure)
Joukowski equation - valve closure surge
Estimate surge pressure from rapid valve closure (water hammer). Checks if pipe pressure rating is adequate. Based on Joukowski equation.
System Inputs
Flow velocity fps
Pipe material
Pipe outer diameter mm
Pipe wall thickness mm
Normal operating pressure psi
Hydrant Flow Test Calculator
Pitot gauge method - NFPA 291 / ISO basis
Calculate available fire flow from a hydrant flow test using pitot gauge readings. Determines flow at residual pressure and projects available flow at 20 psi residual. Used for fire system design verification.
Flow Test Readings
Static pressure (no flow) psi
Residual pressure (at flow) psi
Pitot pressure (at flow outlet) psi
Outlet diameter inches
Discharge coefficient (Cd)
Dry Pipe System Volume
NFPA 13 - time-to-water / compressor sizing
Calculate the air volume in a dry pipe or pre-action sprinkler system. Determines compressor sizing and estimated time-to-water for the most remote sprinkler. NFPA 13 Section 7.2.
System Configuration
Pipe size NPS in
Total pipe length in system ft
System air pressure (supervisory) psi
Water supply pressure psi
Number of sprinkler branches
⚡ Energy Consumption Calculator
kWh / cost estimation - energy audit basis
Estimate electrical energy consumption and running cost for equipment and systems. Useful for energy audits, LEED calculations, and equipment justification studies.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Load Inputs
Tariff
Energy tariff $/kWh
Operating days per year
Thumb Rules
Quick engineering estimates - clearly labeled, never mistaken for calculations
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Settings
App preferences
Unit System
IP (Imperial): BTU, °F, ft, GPM, psi, CFM, in w.g.
SI (Metric): kJ, °C, m, L/s, kPa, m³/s, Pa
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About MEP QuickDesign™
MEP QuickDesign™
by Augmintech Education Pvt. Ltd.
75 calculators across HVAC, Plumbing, Fire Fighting, and Electrical - built on ASHRAE, SMACNA, IPC, NFPA, and IEC standards.
ASHRAE
NFPA
IEC
SMACNA
IPC
Results are for engineering guidance only. All designs must be reviewed by a qualified professional engineer before use in construction or regulatory submission.
MEP QuickDesign™ is a trademark of Augmintech Education Pvt. Ltd. · Version 1.0.0
© Augmintech Education Pvt. Ltd. All rights reserved.
MEP QuickDesign™ is a trademark of Augmintech Education Pvt. Ltd. · Version 1.0.0
© Augmintech Education Pvt. Ltd. All rights reserved.
Data Management
All calculations and projects are stored locally in your browser's localStorage. Clearing browser data will erase saved calculations.
Standards Notes
Quick reference cards - ASHRAE · SMACNA · IPC · NFPA · IEC · NEC
✕
🔍 MEP Design Checker
Quick validation - OK / Warning / Not Acceptable
Enter any combination of design parameters and get instant pass/fail feedback with recommended engineering ranges. Works like a rapid design review on your phone.
⚡ Electrical Quick Tools
kW↔HP↔kVA · Phase · Diversity · Demand factors
Fast conversions and decision guides for everyday electrical design. No complex inputs - instant answers.
⚡ kW ↔ HP ↔ kVA Converter
kW
HP
kVA (PF=0.85)
📊 Diversity & Demand Factor Guide
Load Type
Demand F
Diversity F
Lighting
0.85
0.90
Receptacles
0.75
0.80
HVAC
0.65
0.75
Motors
0.75
0.70
Office equipment
0.70
0.75
Entire building
-
0.65–0.80
🔌 Cable Type Selector Guide
🔋 Voltage System Reference
System
L-L
L-N
IEC 3-phase
400V
230V
Gulf region
415V
240V
US 3-phase
480V
277V
US commercial
208V
120V
MV distribution
11kV / 33kV
-
⚡ Power Triangle Tool
P · Q · S · PF - interactive visual
Enter any two of P (kW), Q (kVAR), S (kVA), or PF - the rest are calculated instantly. Visualised as a power triangle.
Inputs (enter any two)
P - Active power kW
Q - Reactive kVAR
S - Apparent kVA
PF 0–1
⚡ Electrical Selector Guides
Protection device · Earthing type · Transformer type
✕
Flow ↔ Velocity Calculator
Q = A × V - pipe and duct
Instantly convert between flow rate, velocity, and pipe/duct cross-section. Works for both round pipes and rectangular ducts.
Round Pipe
Diameter mm
Velocity m/s
Flow = -
| -
Rectangular Duct
W mm
H mm
Vel m/s
Flow = -
| -
Find Velocity from Flow
Flow L/s or CFM
Pipe diameter mm
Velocity = -
-
Pipe Weight Calculator
Pipe + water weight for structural loading
Calculate weight of pipe (empty and water-filled) per metre run. Useful for support spacing and structural loading estimates.
Pipe Inputs
Pipe material
Outer diameter mm
Wall thickness mm
Length of run m
Results
Internal diameter
-
Pipe weight (empty)
-
Water weight inside
-
Total weight (water-filled)
-
Weight per metre
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Pump Power (Quick)
P = ρgQH/η - instant motor sizing
Quickly estimate pump motor power from flow and head. Works for water, chilled water, fire water - any Newtonian fluid.
Inputs
Flow rate
Total head m w.g.
Overall efficiency % (pump+motor)
Fluid
Results
Hydraulic power
-
Shaft / motor input power
-
Nearest standard motor
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HP equivalent
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MEP System Selector
AHU type · Pump type · Fire system · Lighting type
✕
Pipe Material Selection Guide
Quick selection by service · temperature · pressure
✕
Site Quick Tools
Pump head · Tank fill · Fuel · Fixture count · Cable length
Fast on-site calculations. Minimal inputs, instant answers - designed for use on a phone on site.
💧 Pump Head from Building Height
Height (m)
Friction add (%)
Approx pump head: -
🪣 Tank Fill Time
Tank volume (L)
Fill rate (L/min)
Fill time: -
⛽ Generator Fuel Estimate
Load (kVA)
Load %
Hours
Diesel consumed: -
💡 Quick Lighting Count
Area (m²)
Lux target
Lm/fitting
Approx fittings: -
📏 Cable / Pipe Length with Waste
Net run (m)
Waste/fittings (%)
Order quantity: -
⚡ Load Calculation
Demand load estimation - NEC 220 / IEC 60364 conceptual basis
PRELIMINARY ESTIMATION ONLY. Not a full NEC Art. 220 or IEC 60364 load schedule. Results must be verified by a qualified electrical engineer.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Load Inputs (kW)
Lighting load kW
Receptacle / General Power kW
HVAC / Mechanical kW
Motor loads kW
Special / Process loads kW
Demand Factors
Lighting demand factor 0–1
Receptacle demand factor 0–1
HVAC demand factor 0–1
Motor demand factor 0–1
Special loads factor 0–1
Diversity factor 0–1
Power factor 0–1
Supply voltage V (L-L)
⚡ Current Calculator
kW / kVA to current - single and three phase
Convert between power and current for any voltage and phase configuration. Accounts for power factor.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Inputs
Phase Type
Single Phase
Three Phase
Input Mode
kW (with PF)
kVA (apparent)
Active Power kW
Power Factor 0–1
Voltage V (L-L)
⚡ Cable Sizing Calculator
IEC 60364-5-52 simplified - current capacity + voltage drop
Engineering estimation tool. IEC 60364-5-52 simplified current capacity tables with ambient temperature and grouping derating. Not a full compliance check.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Circuit Parameters
Design Current A
Conductor Material
Copper (Cu)
Aluminium (Al)
Installation Method
Ambient Temperature °C
Circuits grouped together
Circuit Length (one-way) m
System Voltage V (L-L for 3-ph)
Phase
Three Phase
Single Phase
⚡ Voltage Drop Calculator
IEC 60364 / NEC basis - resistive component method
Calculate voltage drop for a circuit. Uses resistive component only. Reactive component adds 1–3% additional drop in heavily inductive circuits.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Circuit Inputs
Phase Type
Three Phase
Single Phase
System Voltage V (L-L)
Design Current A
Cable Length (one-way) m
Cable Size mm²
Conductor Material
Copper
Aluminium
Operating Temperature °C
⚡ Transformer Sizing
kVA rating selection - IEC 60076 conceptual basis
Select standard transformer kVA rating for a given electrical load with diversity and growth factors.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Load Inputs
Total connected load kW
Power factor 0–1
Diversity factor 0–1
Future growth factor ≥1.0
Safety margin %
⚡ Generator Sizing
Standby / prime power DG set sizing
Estimate diesel generator kVA rating accounting for running loads, motor starting, diversity, and future growth.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Load Inputs
Running load (non-motor) kW
Motor loads (running) kW
Motor starting method
Power factor 0–1
Diversity factor 0–1
Future growth factor ≥1.0
⚡ Power Factor Correction
Capacitor bank sizing - Q = P·(tan φ₁ − tan φ₂)
Calculate required capacitor bank kVAR to improve power factor to target. Shows kVA reduction and current saving.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Inputs
Active load kW
Existing power factor
Target power factor
System voltage V (L-L)
⚡ Lighting Calculator (Lumen Method)
N = (E × A) / (Φ × UF × MF) - not a DIALux replacement
Estimate number of luminaires using the lumen method. Quick sizing tool for preliminary design. Use DIALux or AGi32 for full photometric calculations.
⚡ Electrical calculators use IEC/SI units (kW, V, A, kVA, mm²) regardless of the IP/SI toggle.
Room & Lighting Inputs
Room Area m²
Target Illuminance
Luminaire type
Luminaire wattage W
Utilisation factor (UF) 0.4–0.8
Maintenance factor (MF) 0.65–0.85