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Electrical calculators
Explore 4 free electrical calculators. Calculate in your browser with clear inputs, worked examples, and transparent methods.
4 calculators available
- Electricity Calculator
Estimate appliance energy use and cost from power, daily runtime, days, and electricity rate.
- Ohm's Law Calculator
Calculate voltage, current, resistance, and power from any two selected electrical values.
- Resistor Calculator
Decode a four-band resistor value from colour digits, multiplier, and tolerance.
- Voltage Drop Calculator
Estimate two-conductor copper or aluminum circuit voltage drop from length, current, voltage, and wire area.