Calculators
Electrical Calculators
Power, cables and protection, motors, transformers, circuits, backup power, lighting and earthing. Every tool shows the formula, a worked example and the standard it is based on.
All Electrical Tools
Power and Energy
Power Factor Correction CalculatorkVAR, µF per phasekW to Amps CalculatorkW to A, 1 phase and 3 phaseAmps to kW CalculatorA to kW, 1 phase and 3 phasekVA to Amps CalculatorkVA to A, GeneratorskW to kVA CalculatorkW ↔ kVA, kVARPower Triangle CalculatorkW, kVAR, kVA, Power factorElectricity Cost CalculatorkWh, Daily, monthly, yearlyVoltage Unbalance CalculatorNEMA MG1 method, Three phase
Cables and Protection
Cable Size and Voltage Drop CalculatorDC, 1 phase, 3 phase, Copper and aluminiumCable Resistance CalculatorCopper and aluminium, Temperature correctedCable Short Circuit Rating CalculatorAdiabatic equation, Earth conductor sizeTransformer Current and Short Circuit CalculatorFull load current, Short circuit currentIDMT Relay Operating Time CalculatorIEC 60255 curves, TMSEarth Fault Loop Impedance CalculatorZs = Ze + R1 + R2, MCB type B, C, D
Motors and Transformers
Motor Full Load Current CalculatorkW and HP, Three and single phaseMotor Torque CalculatorkW to N·m, HP to lbf·ftSynchronous Speed and Slip CalculatorNs = 120f/P, Slip %Star Delta Starter CalculatorDOL vs star delta, Starting currentVFD Frequency and Speed CalculatorHz to rpm, rpm to HzTransformer Turns Ratio CalculatorTurns ratio, Voltage ratio
Circuits and Components
Ohm's Law CalculatorV = I × R, P = V × ISeries and Parallel Resistor CalculatorSeries, ParallelVoltage Divider CalculatorVout = Vin × R2/(R1+R2), Loaded dividerCapacitive and Inductive Reactance CalculatorXc = 1/(2πfC), XL = 2πfLLC Resonant Frequency Calculatorf = 1/(2π√LC), Find L or CRC Time Constant Calculatorτ = R × C, ChargingLED Resistor CalculatorR = (Vs − Vf) ÷ I, E24 standard valueResistor Color Code Calculator4 band, 5 bandCapacitor Series and Parallel CalculatorSeries, ParallelCapacitor Energy and Charge CalculatorE = ½CV², Q = CVAWG to mm² Wire Size CalculatorAWG to mm², mm² to AWGDecibel (dB) CalculatorPower ratio, Voltage ratioDelta Star (Δ Y) Conversion CalculatorΔ to Y, Y to Δ
Power Supply and Backup
Lighting and Earthing
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Frequently Asked Questions
Are these electrical calculators free?
Yes. All calculators on instrumentationblog.in are free, run in your browser and need no sign up.
How accurate are the electrical calculators?
Each tool follows the published standard or textbook equation for its topic, shows the formula and the calculation steps, and has been checked against worked examples. Always confirm critical designs against the relevant standard and manufacturer data.
More Calculator Categories
Temperature Measurement15 live toolsInstrumentation Signal4 live toolsPLC Digital Signal3 live toolsFlow Measurement19 live toolsLevel Measurement12 live toolsPressure Measurement13 live toolsControl Valve12 live toolsCalibration10 live toolsSafety and SIL7 live toolsAnalytical8 live toolsUnit Converters76 converters, 700+ units