Energy · Problem-solving calculator
Time-of-Use Energy Cost Calculator
Estimate electricity energy charges across off-peak, mid-peak, and on-peak time-of-use periods.
- Free to use
- Runs in your browser
- Level B · Industry formula
- Last reviewed 2026-08-17
Calculator guide
What this calculator helps you solve
Estimate electricity energy charges across off-peak, mid-peak, and on-peak time-of-use periods.
Inputs explained
- Off-peak use (kWh) — enter the value that applies to your operation or scenario.
- Off-peak rate ($/kWh) — enter the value that applies to your operation or scenario.
- Mid-peak use (kWh) — enter the value that applies to your operation or scenario.
- Mid-peak rate ($/kWh) — enter the value that applies to your operation or scenario.
- On-peak use (kWh) — enter the value that applies to your operation or scenario.
- On-peak rate ($/kWh) — enter the value that applies to your operation or scenario.
Formula and methodology
Worked example
12,000 off-peak kWh at $0.09, 6,000 mid-peak at $0.14, and 3,500 on-peak at $0.24 produce $2,760 in energy charges.
How to interpret the result
Use the period breakdown to test load-shifting scenarios. Demand charges, riders, taxes, fixed charges, and seasonal rules may materially change the total bill.
What to keep in mind
- Enter the exact rate structure from the applicable tariff or contract.
- This calculator estimates energy charges only unless all additional charges are separately incorporated into the rates.
Review approach
This calculator uses deterministic arithmetic and performs the calculation locally in your browser. It is designed to combine operational inputs into a decision-oriented result rather than return a one-line conversion.
Review standard: Level B · Industry formula. How calculator reviews work.
Frequently asked questions
What decision can this calculator support?
Use the period breakdown to test load-shifting scenarios. Demand charges, riders, taxes, fixed charges, and seasonal rules may materially change the total bill.
How is the result calculated?
TOU Energy Cost = Σ (Energy Used in Period × Period Energy Rate).
Are the assumptions universal?
No. Operational, regulatory, technical, and industry assumptions vary. Use values that apply to your situation and verify professional or regulatory requirements where relevant.
Does CalculateMeasure store the values I enter?
The calculation runs in your browser and does not require sending the entered calculator values to a server to produce the result.