Amps to Volts Calculator
Convert amps to volts using resistance or power with Ohm's law.
18 free calculators
Electrical calculators for watts, amps, volts, and kWh
Convert electrical units, estimate battery capacity, check voltage drop, and compare electricity costs with UK-first assumptions.
Amps to Watts Calculator
Convert amps to watts and kilowatts for DC and AC circuits.
Electricity Cost Calculator (kWh)
Calculate electricity cost from meter readings, kWh usage, unit rate, standing charge, and VAT.
kW to kWh Calculator
Convert kilowatts and running time into kilowatt hours and estimated cost.
kWh to kW Calculator
Convert kilowatt hours and time into average kilowatts and watts.
kWh to Watts Calculator
Convert kilowatt hours and time into an average power rating in watts.
LED Resistor Calculator
Calculate LED series resistor value, nearest E24 resistor, and power rating.
mAh to Wh Calculator
Convert milliamp hours to watt hours for batteries and airline capacity checks.
Parallel Resistor Calculator
Calculate total resistance for up to 10 resistors connected in parallel.
Series Resistor Calculator
Calculate total resistance for up to 10 resistors connected in series.
Voltage Drop Calculator
Estimate voltage drop in copper cables and compare against common UK guide limits.
Volts to Amps Calculator
Convert volts to amps using resistance or power with Ohm's law.
Volts to Watts Calculator
Calculate watts from voltage, current, and optional AC power factor.
Watts to Amps Calculator
Convert watts to amps for DC, single-phase AC, and three-phase AC circuits.
Watts to kWh Calculator
Convert watts and running time into kWh usage and estimated electricity cost.
Watts to Volts Calculator
Calculate volts from watts, current, and optional AC power factor.
Wh to mAh Calculator
Convert watt hours to milliamp hours for batteries, power banks, and electronics.
Wire Size Calculator
Estimate UK cable size from design current, circuit length, and voltage drop guide limits.
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- Electrical Safety First
UK electrical safety advice for homes, products, and installations.