How the Electricity Calculator works.
energy (kWh) = power (kW) × hours/day × days; cost = energy × price/kWhPower is the appliance rating, operating time is hours per day, days is a whole-number period, and price is the chosen currency per kWh.
Worked example for the Electricity Calculator.
A 1.5 kW appliance used for 4 hours per day over 30 days consumes 180 kWh; at 0.20 per kWh the energy charge is 36.
How to read this result.
The result estimates electrical energy use and its variable energy charge from power, operating time, days, and unit price.
How this tool gets the answer
energy (kWh) = power (kW) × hours/day × days; cost = energy × price/kWh. Power is the appliance rating, operating time is hours per day, days is a whole-number period, and price is the chosen currency per kWh. The result estimates electrical energy use and its variable energy charge from power, operating time, days, and unit price.
A useful example
A 1.5 kW appliance used for 4 hours per day over 30 days consumes 180 kWh; at 0.20 per kWh the energy charge is 36. A quick way to verify the calculation is: Convert watts to kilowatts when necessary, multiply kW by hours per day and days, then multiply kWh by the entered price.
What the result tells you
The result estimates electrical energy use and its variable energy charge from power, operating time, days, and unit price. Watts are converted to kilowatts before multiplying by hours. A kilowatt-hour is energy, while a kilowatt is instantaneous power.
Where the answer can go wrong
Power, hours, days, and price must be finite and nonnegative; hours per day cannot exceed 24 and the day count must be a whole number. Bills may also include fixed charges, taxes, time-of-use rates, demand charges, tiering, power factor, and appliance duty cycles.
Privacy and practical use
The calculation runs locally in your browser and FigureNest does not send the entered values to a calculation service. Keep the source value and its unit with any result you save so you can reproduce the calculation later.
Inputs and edge cases to check.
Power, hours, days, and price must be finite and nonnegative; hours per day cannot exceed 24 and the day count must be a whole number.
What this tool does not include.
Bills may also include fixed charges, taxes, time-of-use rates, demand charges, tiering, power factor, and appliance duty cycles.
Reference guidance and methodology.
Electricity Calculator questions.
What does the Electricity Calculator do?
Estimate appliance energy use and variable electricity cost from power and operating time.
How can I check the result?
Convert watts to kilowatts when necessary, multiply kW by hours per day and days, then multiply kWh by the entered price.
Which units and assumptions matter?
Watts are converted to kilowatts before multiplying by hours. A kilowatt-hour is energy, while a kilowatt is instantaneous power. Bills may also include fixed charges, taxes, time-of-use rates, demand charges, tiering, power factor, and appliance duty cycles.
Are the entered values sent or stored?
No. The calculation runs locally in your browser and FigureNest does not send or store calculator inputs.