01
Formula
kWh = watts × hours ÷ 1,000.
Cost = kWh × price per kWh. Cost per day divides that total by the number of days. Hours per day cannot exceed 24 in this form.
Apply for financingElectricity cost calculator
Electricity cost calculator from watts and hours
This electricity cost calculator is a kWh calculator first. Watts times hours, divided by 1,000, is kilowatt-hours. Multiply by the price per kilowatt-hour you pay.
Energy
180.00kWh
Electricity cost$28.80
Cost per day$0.96
Planning estimate from the numbers you enter. Coverage, density, waste and price are assumptions, not a supplier quote or an engineering specification.
How it works
A kilowatt-hour is 1,000 watt-hours.
A 1,500 watt load running for one hour uses 1.5 kWh. The form multiplies watts by hours per day and by days, divides by 1,000, then multiplies by your rate. The rate starts at 0.16 so the example has a number. It is not a utility tariff. Standby draws and a cycling thermostat are not modeled. If the nameplate wattage is a maximum, the real average may be lower. Type the watts you believe the load actually draws.
02
Example
1,500 watts, 4 hours a day, for 30 days, at $0.16 per kWh.
Energy is 180.00 kWh. Cost is $28.80. That is $0.96 per day. Change the rate to the figure on the bill. Change the watts if the nameplate is not the running load.
03
Tips
Nameplate watts are often the ceiling.
A heater near its rating is close to this math. A tool that cycles is not. Measure with a meter when the bill matters, then type that average wattage. This kWh calculator will not invent a duty cycle.
04
Equipment
The operating cost is not the purchase price.
Use the cost to see what a machine adds to the bill. Financing the machine, from $15,000 to $2 million, is a separate application with Dengaro. The kilowatt-hours are not the amount financed.
Important questions
Know what to expect.
How do I use this as a kWh calculator without a price?+
Read the energy line. The cost line can be ignored, or set the price to zero and the cost becomes $0.00. The kilowatt-hours do not depend on the price.
Why divide by 1,000?+
A kilowatt is 1,000 watts. Watt-hours divided by 1,000 are kilowatt-hours, which is the unit on an electric bill.
Does the rate include fees and taxes?+
Only if you fold them into the price per kilowatt-hour you type. The calculator multiplies. It does not read a tariff.
Can I enter a three-phase load?+
Enter the watts the load draws. If you only know volts and amps, convert to watts first. This page starts from watts.
Financing built into the sale