Electrical & Energy Calculators
66 free calculators for UK energy and electrical calculations. No signup, no login, instant answers.
66 calculators, five categories
Every calculator is a self-contained page. Click through, enter your numbers, get an answer. Nothing is stored, nothing is logged.
Electrical basics
Core circuit and electrical calculations: Ohm's law, sizing cables and breakers, and the building blocks of any UK installation.
Conversions
Amps, volts, watts, kW, kVA, VA, kWh, joules, horsepower, Ah, mAh and Wh, every direction covered.
Cost & consumption
Work out bills, running costs, consumption and carbon footprint for sites, appliances and meters.
Solar & batteries
Size solar PV arrays and battery storage, and model payback on LED upgrades and heat pumps.
EV & charging
Cost per mile, charger sizing and EV-to-volts conversions for commercial fleets and workplace chargers.
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