Energy
Energy Calculators
Estimate electricity cost, convert watts to amps and calculate battery runtime for appliances, circuits, devices and energy-use planning.
Electricity cost
Watts & amps
Battery runtime
Energy use
3 calculators
Popular Energy Calculators
Based on usage & relevanceAll Energy Calculators
3 tools
Electricity Cost Calculator
Estimate daily, monthly and yearly electricity cost for an appliance or device.
Open calculator → Watts to Amps CalculatorConvert watts to amps for DC, single-phase AC and three-phase AC circuits.
Open calculator → Battery Life CalculatorEstimate battery runtime from capacity, load current and usable capacity.
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Using Energy Calculators
Electricity Cost converts power and usage time into energy expense. Watts to Amps helps with electrical current estimates when voltage and circuit type are known, while Battery Life focuses on stored capacity and load.
Enter the requested values carefully, keep units consistent and review the formula, assumptions and supporting result details shown by the selected calculator.
Actual electrical and battery performance can vary with efficiency, power factor, duty cycle, temperature, battery chemistry, age and utility pricing.