Electricity Bill Calculator

How your electricity bill is worked out

• Energy charge = units used (kWh) × unit rate (£/kWh).
• Standing charge = daily charge (p/day) × number of days ÷ 100.
• Total = energy charge + standing charge.
• Average price = total ÷ kWh used (includes the standing charge).
• Tiered rates apply different prices to successive blocks of usage.

Enter the unit rate and standing charge from your latest bill or tariff. Rates differ by supplier and region; this is an estimate to help you budget. Everything is calculated locally in your browser.

Frequently Asked Questions

How is a UK electricity bill calculated?

Bill = (units used in kWh × unit rate in £/kWh) + (standing charge in pence/day × number of days ÷ 100). The standing charge is a fixed daily cost you pay even if you use no electricity.

What is the standing charge?

The standing charge is a fixed daily fee, quoted in pence per day, covering the cost of supplying your home and maintaining the network. It is added on top of your usage charge.

How much is the unit rate?

The unit rate is the price per kWh of electricity, in pounds. It varies by tariff and region and is capped by Ofgem for standard variable tariffs. Enter your own rate from a recent bill for an accurate estimate.

How do I find my usage in kWh?

Take a meter reading at the start and end of the period and subtract, or read the kWh figure directly from a recent bill or your smart meter.