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.
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All Electrical Tools
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Power and Energy8
Power and EnergyPower Factor Correction CalculatorkVAR, µF per phasePower and EnergykW to Amps CalculatorkW to A, 1 phase and 3 phasePower and EnergyAmps to kW CalculatorA to kW, 1 phase and 3 phasePower and EnergykVA to Amps CalculatorkVA to A, GeneratorsPower and EnergykW to kVA CalculatorkW ↔ kVA, kVARPower and EnergyPower Triangle CalculatorkW, kVAR, kVA, Power factorPower and EnergyElectricity Cost CalculatorkWh, Daily, monthly, yearlyPower and EnergyVoltage Unbalance CalculatorNEMA MG1 method, Three phase
Cables and Protection6
Cables and ProtectionCable Size and Voltage Drop CalculatorDC, 1 phase, 3 phase, Copper and aluminiumCables and ProtectionCable Resistance CalculatorCopper and aluminium, Temperature correctedCables and ProtectionCable Short Circuit Rating CalculatorAdiabatic equation, Earth conductor sizeCables and ProtectionTransformer Current and Short Circuit CalculatorFull load current, Short circuit currentCables and ProtectionIDMT Relay Operating Time CalculatorIEC 60255 curves, TMSCables and ProtectionEarth Fault Loop Impedance CalculatorZs = Ze + R1 + R2, MCB type B, C, D
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Motors and Transformers6
Motors and TransformersMotor Full Load Current CalculatorkW and HP, Three and single phaseMotors and TransformersMotor Torque CalculatorkW to N·m, HP to lbf·ftMotors and TransformersSynchronous Speed and Slip CalculatorNs = 120f/P, Slip %Motors and TransformersStar Delta Starter CalculatorDOL vs star delta, Starting currentMotors and TransformersVFD Frequency and Speed CalculatorHz to rpm, rpm to HzMotors and TransformersTransformer Turns Ratio CalculatorTurns ratio, Voltage ratio
Circuits and Components13
Circuits and ComponentsOhm's Law CalculatorV = I × R, P = V × ICircuits and ComponentsSeries and Parallel Resistor CalculatorSeries, ParallelCircuits and ComponentsVoltage Divider CalculatorVout = Vin × R2/(R1+R2), Loaded dividerCircuits and ComponentsCapacitive and Inductive Reactance CalculatorXc = 1/(2πfC), XL = 2πfLCircuits and ComponentsLC Resonant Frequency Calculatorf = 1/(2π√LC), Find L or CCircuits and ComponentsRC Time Constant Calculatorτ = R × C, ChargingCircuits and ComponentsLED Resistor CalculatorR = (Vs − Vf) ÷ I, E24 standard valueCircuits and ComponentsResistor Color Code Calculator4 band, 5 bandCircuits and ComponentsCapacitor Series and Parallel CalculatorSeries, ParallelCircuits and ComponentsCapacitor Energy and Charge CalculatorE = ½CV², Q = CVCircuits and ComponentsAWG to mm² Wire Size CalculatorAWG to mm², mm² to AWGCircuits and ComponentsDecibel (dB) CalculatorPower ratio, Voltage ratioCircuits and ComponentsDelta Star (Δ Y) Conversion CalculatorΔ to Y, Y to Δ
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Power Supply and Backup2
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.
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