Power & Electrical
Power, running cost and electrical estimating calculators.
Estimate running costs, battery runtime, current, power factor and specialist electrical values from clear inputs.
Useful for
- Bills and appliance costs
- Battery runtime
- Current estimates
- Electrical notes
Bills
Watts → kWh → running cost
Battery
Ah and voltage → usable Wh → runtime
Electrical
PFC → Zs → R1+R2
Live tools
Power & Electrical tools.
Use these for power, electricity running cost, battery runtime and specialist electrical calculations.
Electricity Cost Calculator
Estimate running cost from watts, hours and unit…
Electrical · LivekWh Usage Calculator
Estimate kWh from watts, hours per day and number of days.
Electrical · LiveBattery Runtime Calculator
Estimate battery runtime from voltage, capacity…
Electrical · LiveOhm's Law Calculator
Calculate voltage, current, resistance or power from…
Electrical · LiveSingle Phase Current Calculator
Estimate current from watts, voltage and power factor…
Electrical · LiveThree Phase Current Calculator
Estimate three-phase line current from kW, voltage and…
Electrical · LivePower Factor Calculator
Calculate power factor from real power and apparent power.
Electrical · LiveLED Transformer Load Calculator
Check LED load against transformer/driver rating with…
Electrical · LiveProspective Fault Current Calculator
Calculate prospective fault current from voltage and…
Electrical · LiveEarth Fault Loop Impedance Calculator
Estimate Zs from Ze and R1+R2, compare against a max…
Electrical · LiveR1+R2 Calculator
Work out R1+R2 from measured Zs and Ze, with simple…
Electrical · LiveBasic Voltage Drop Calculator
Quick voltage drop estimate from current, length…
Who it is for
Useful for homeowners checking running costs and specialists checking quick estimates.
Accuracy notes
Electrical work must follow local regulations and competent design.
Specialist tools
Electrician-focused tools sit here as a specialist sub-set.