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Electrical & Building Maintenance Calculators
Calculate motor current, apparent power, electricity cost, voltage drop, power-factor compensation and Ohm’s law. Choose a calculator below.
CALCULATOR
Motor Current
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Convert motor kW or HP to running current.
CALCULATOR
kVA ↔ Amps
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Convert kVA to amps, or amps back to kVA.
CALCULATOR
Electricity Cost
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Estimate energy units and cost for multiple loads.
CALCULATOR
Voltage Drop
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Check voltage drop using copper or datasheet R/X.
CALCULATOR
Power Factor / kVAR
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Estimate kvar needed to improve lagging power factor.
CALCULATOR
Ohm’s Law
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Find V, A, Ω and W from two known values.
CALCULATOR
Cable Size
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Estimate a conductor-size candidate from your chosen voltage-drop limit, with an optional check against your own manufacturer ampacity table.
CALCULATOR
Battery Backup
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Estimate UPS or inverter backup from battery-bank configuration, state of charge, capacity allowance and AC load.
CALCULATOR
AC Tonnage
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Convert a known cooling load to TR/BTU, or make a preliminary room estimate using an explicitly entered project heat-load allowance.
CALCULATOR
Pump Head & HP
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Calculate pump shaft power and estimated electrical input from flow and total dynamic head, or build head from net lift, friction and pressure.
CALCULATOR
DG Fuel & Cost
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Analyse measured diesel use against running hours and generated energy from the same interval. Report fuel cost per unit and optional same-rate projections.
CALCULATOR
CFM / AHU Airflow
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Calculate airflow from room volume and chosen ACH, sensible cooling load and temperature difference, or measured average duct velocity.
Calculate, understand and keep the result
Each calculator has labelled inputs, an example, the formula and a result summary. Calculate first, then copy the result, download its CSV or use your browser’s Print / Save PDF option. No API key or account is required.
Use equipment data for power factor, efficiency and cable resistance. The electricity-cost tool uses the rate you enter. A calculation result is specific to those assumptions; it does not select protective equipment or certify an installation.
Start with the right electrical quantity
Motor shaft-output kW differs from electrical-input kW. Apparent power in kVA differs from active power in kW. For three-phase current, choose the correct line-to-line or line-to-neutral voltage reference.
For a voltage-drop check on a motor or aluminium cable, use the datasheet R/X option. The simple copper model is a resistance estimate at unity power factor.
