Electricity Cost Calculator
Enter load watts, daily runtime, days, and rate per kWh to estimate energy use and cost. This does not model utility tariffs or demand charges.
- Daily energy
- kWh/day
- Total energy
- kWh
- Estimated cost
- $
- Average daily cost
- $/day
Calculation details
- Rate used
- $/kWh
- Calculation basis
- Billing boundary
Recent results
Formulas
- Daily energy kWh = watts / 1000 x hours per day
- Total energy kWh = daily energy kWh x days
- Estimated cost = total energy kWh x rate per kWh
Use this calculator
Estimate kWh and cost from power, runtime, billing days, and a user-entered electricity rate.
Read the result
Review the calculated values with their displayed units and assumptions. The result is a planning aid for the stated inputs, not a final equipment or installation decision.
Check before final work
This is a simple energy-cost estimate. Utility bills can include demand charges, time-of-use periods, taxes, riders, minimum bills, fixed charges, and other tariff rules not modeled here.
FAQs
Where do I find the rate per kWh?
Use the energy rate from a utility bill or published rate schedule. The result is only as accurate as the rate and runtime you enter.
Does this match my full utility bill?
No. It estimates energy charges only and does not include demand charges, taxes, fixed fees, riders, or time-of-use differences.