Check a billUnit ratekWh costBill maths
What is unit rate on an energy bill? Plus the simple kWh cost formula
The unit rate is the price per kilowatt hour of energy used. It matters because it lets you isolate the variable usage part of the bill before you add standing charge or argue about monthly payments.
The simple formula most people actually need
kWh used × unit rate = the variable usage cost before standing charge.
That is the core number people need when they are sense-checking a bill. Then add standing charge × billed days separately.
| Charge | What it means |
|---|---|
| Unit rate | The price per kWh of energy used. |
| Standing charge | The fixed daily charge applied whether you use a lot or a little. |
Best related pages
Common unit-rate mistakes
- Comparing the unit rate alone and ignoring billed days or standing charge.
- Using the wrong rate on a multi-rate or Economy 7 style setup.
- Comparing a headline national number instead of the actual tariff or region context on the bill.
- Treating direct debit as if it were the same thing as the unit rate.
If the query is really “why is my bill so high?”, unit rate is only one piece of the diagnosis. Use it as a building block, not the whole answer.
Official and reference sources
Frequently asked questions
Is unit rate the same as standing charge?
No. Unit rate is the price per kWh used. Standing charge is a fixed daily charge.
Can I check a bill with unit rate alone?
Not completely. You still need standing charge, billed days and any multi-rate context.
Why does the unit rate matter in a dispute?
Because it helps you isolate whether the problem is usage cost, fixed charges or something else like reading history.