General tools
Energy Price Cap Calculator UK
Use this as a quick unit-rate estimator. It is not a full bill forecast because standing charges and regional differences vary.
Estimated running cost
- Per hour
- 24.67p
- Per day
- £2.47
- Per week
- £17.27
- Per month
- £74.01
- Per year
- £900.46
Formula: kWh used × unit rate, plus standing charges where relevant.
Cost table
| Scenario | Power | Use time | Cost at 24.67p/kWh |
|---|---|---|---|
| 100 kWh electricity | 100,000W | 1 hours | £24.67 |
| 250 kWh electricity | 250,000W | 1 hours | £61.68 |
| 500 kWh electricity | 500,000W | 1 hours | £123.35 |
Formula
kWh used × unit rate, plus standing charges where relevant = running cost
For example, a 1,000W energy usage used for 1 hour at 24.67p/kWh costs 1 x 1 x 24.67p = 24.67p.
Ways to reduce the cost
- Use actual meter readings or supplier statements for precise usage.
- Separate electricity and gas because their rates are different.
- Check standing charges on your own bill.
- Review rates whenever Ofgem updates the cap.
FAQs
Is the price cap my maximum bill?
No. It limits unit rates and standing charges, not total usage.
Why does my tariff differ?
Rates vary by region, payment method, supplier and meter type.
Does this include standing charge?
The calculator focuses on unit costs; standing charges are noted separately.
When should this page be updated?
Quarterly when Ofgem updates price cap rates.
Last reviewed 3 May 2026. Source: Ofgem energy price cap. Figures are estimates. Actual prices vary by region, supplier, tariff, payment method and meter type.