This HVAC electrical calculator is designed for technicians working with air conditioning, refrigeration, mechanical services, BMS controls and electrical equipment.

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The tool includes common field calculations such as kW to amps, amps to kW, single phase current, three phase current, VA to watts, watts to VA, power factor, motor current, electric heater current, voltage drop estimates, 24VAC transformer loading and BMS signal conversion.

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It can be used for quick checks on pumps, fans, compressors, electric duct heaters, control panels, transformers, actuators, relays, pressure sensors, temperature sensors, CO₂ sensors, humidity sensors and energy meter CT scaling.

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For HVAC and BMS technicians, common uses include checking three phase current at 400V or 415V, estimating transformer load for 24VAC controllers and actuators, converting 4-20mA signals into engineering values, converting 0-10V signals into pressure or temperature readings, and estimating voltage drop on long cable runs.

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This calculator is intended as a field reference only. Final electrical design, cable sizing, protection, isolation, compliance and equipment selection must always be confirmed by a qualified person using the correct standards, wiring diagrams, nameplate data and site conditions.

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Common electrical calculations for HVAC technicians

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HVAC technicians often need to quickly convert between kW, amps, volts, watts, VA and power factor while fault finding or checking equipment operation. This calculator brings common electrical formulas into one simple tool for field use.

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The kW to amps calculator can be used for estimating load current on single phase and three phase equipment. The three phase calculator is useful for checking motors, pumps, fans, compressors and electric heaters operating at common Australian voltages such as 400V and 415V.

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The 24VAC transformer calculator is useful for BMS control panels where multiple controllers, damper actuators, relays and sensors are powered from the same transformer. It helps estimate total VA load and remaining transformer capacity.

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The BMS signal converter helps technicians convert 4-20mA, 0-10V, 2-10V and 0-5V signals into engineering values. This is useful when checking pressure transducers, temperature sensors, humidity sensors, CO₂ sensors and analogue outputs from controllers.

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The voltage drop calculator provides a quick estimate for long cable runs. It should only be used as a guide, as final cable selection must consider installation method, derating, protection, grouping, temperature, cable type and the applicable electrical standards.