All Calculators

Free electrical calculators for engineers, students, and technicians. Accurate, fast, and easy-to-use online tools.
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Electricity Bill Auditor
Audit your monthly Electricity Bill
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kW to Amp Calculator
Convert kilowatts to current for DC, single & three phase.
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Voltage Drop Calculator
Calculate voltage drop for cable length and load.
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Power Factor Calculator
Find power factor using kW and kVA values.
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kVA to kW Calculator
Convert apparent power to real power.
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Cable Size Calculator
Find suitable cable size based on current.
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Amps to Watts Calculators
Find Amps to Watts values
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Power Factor Savings Calculator
Estimate monthly and yearly cost savings by improving power factor and reducing penalties
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Capacitor Bank kVAR Calculator
Calculates required kVAR value for capacitor banks to improve power factor and reduce penalties
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Home kWh Consumption Calculator
Calculate daily, monthly, and yearly electricity consumption of your home.
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Solar Panel Calculator
Easily estimate required solar system size, number of panels, inverter capacity, and approximate installation cost.
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Harmonics Calculator (VTHD & ITHD)
Estimate Voltage THD and Current THD for different electrical loads using this free Harmonics Calculator by Calctra.
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LumeMaster Lighting Auditor
Find the perfect LED wattage and lumens for any room.
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