kWh Bill Calculator

Estimate an electricity bill from your kWh usage, per-kWh rate, fixed service charge and tax. Calculates in your browser.

Total bill

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Energy charge-
Fixed charge-
Tax-

Show the math

Energy cost plus any fixed charge, with tax on the subtotal:

total = (kWh × rate + fixed) × (1 + tax)

Tiered or time-of-use plans charge different rates by block or hour, this uses a single flat rate. All math runs in your browser.

What this does

A kWh bill calculator estimates an electricity bill from your usage, per-kWh rate, fixed service charge, and tax.

How to use it

  1. Enter your kWh usage.
  2. Enter the per-kWh rate.
  3. Add any fixed service charge.
  4. Apply the tax rate.

How it works

This uses a single flat rate. Tiered or time-of-use plans charge different rates by block or time of day — use your average rate for a quick estimate.

total = (kWh × rate + fixed) × (1 + tax)

Understanding your result

This uses a single flat rate, so it is a quick estimate rather than an exact bill: tiered and time-of-use plans charge different amounts by block or hour, and your average rate is the best stand-in for those. The fixed service charge is unavoidable regardless of usage, which is why cutting consumption lowers but never zeroes a bill.

Example

900 kWh at $0.15 plus a $10 charge and 8% tax is about $156.

Sources & methodology

Last updated .

Frequently asked questions

How is an electricity bill calculated?

Multiply usage by your rate, add any fixed service charge, then apply tax to the subtotal: total = (kWh \u00d7 rate + fixed) \u00d7 (1 + tax).

What about tiered or time-of-use rates?

Those charge different rates by usage block or time of day. This tool uses a single flat rate \u2014 use your average rate for a quick estimate.

Is my data stored?

No. Everything is calculated locally in your browser.