UK Electricity Bill Calculator
Calculate your UK electricity bill using current Ofgem price cap rates. Includes standing charge, VAT, and payment method adjustments.
Calculate Your UK Electricity Bill
Enter your kWh consumption to estimate your electricity bill.
How UK Electricity Bills Are Calculated (Ofgem Price Cap Formula)
UK electricity bills comprise two distinct charges mandated in the Ofgem Official Energy Price Cap Rate Announcements: a variable unit rate per kilowatt-hour consumed and a fixed daily standing charge:
Where:
- kWh Consumed = active electrical energy registered by your credit or smart meter
- Unit Rate (£/kWh) = price per kilowatt-hour under the Ofgem cap (typically ~24.5p / £0.2450 per kWh)
- Daily Standing Charge (£/day) = fixed daily fee covering National Grid and DNO network maintenance (~60.1p / £0.6010 per day)
- 1.05 = standard 5% Value Added Tax (VAT) applied to domestic energy in the United Kingdom
Scenario: A 3-bedroom UK home consumes 250 kWh over a 30-day monthly billing cycle. The unit rate is 24.5p/kWh and the standing charge is 60.1p/day.
Step 2: Calculate standing charge: $30\text{ days} \times £0.601 = \mathbf{£18.03}$
Step 3: Subtotal before tax: $£61.25 + £18.03 = \mathbf{£79.28}$
Step 4: Add 5% domestic VAT: $£79.28 \times 1.05 = \mathbf{£83.24}$
Monthly Total: £83.24 (equivalent to £998.88 annually for electricity alone).
Average UK Electricity Consumption Benchmarks (Ofgem TDCV)
Consumer benchmarks and distribution network operator margins reported by Energy UK Industry Overview on Retail Supply Margins:
| Household Profile | Typical Occupancy | Annual Electricity Usage | Monthly Electricity Usage | Estimated Monthly Bill (incl. VAT) |
|---|---|---|---|---|
| Low User (Flat / Apartment) | 1 – 2 Persons | 1,800 kWh / year | 150 kWh / month | £57.80 / month |
| Medium User (Semi-Detached) | 2 – 4 Persons | 2,700 kWh / year | 225 kWh / month | £76.80 / month |
| High User (Detached House) | 4 – 5+ Persons | 4,100 kWh / year | 342 kWh / month | £106.30 / month |
| Heat Pump / EV Household | High Electric Load | 7,500 – 10,000 kWh / year | 625 – 833 kWh / month | £175 – £225 / month |
Because the fixed standing charge (~£220/year) applies regardless of power used, low-consumption households pay a disproportionately high effective price per unit.
Economy 7 Day vs Night Tariffs & Load-Shifting Savings
Economy 7 tariffs feature differential pricing across a 7-hour overnight window (typically 12:00 AM to 7:00 AM):
| Tariff Rate Component | Standard Flat Rate | Economy 7 Day / Night | Optimization Strategy |
|---|---|---|---|
| Day Rate (17 Hours) | 24.5p / kWh | 31.0p – 34.0p / kWh (+30%) | Minimize tumble dryer and oven use during daylight hours. |
| Night Rate (7 Hours) | 24.5p / kWh | 13.5p – 16.0p / kWh (-40%) | Charge EV, heat water cylinder, schedule washing machine. |
| Daily Standing Charge | 60.1p / day | 60.1p – 65.0p / day | Fixed network connection charge. |
Break-Even Rule: You must shift at least 35% to 40% of total electrical consumption into the 7-hour overnight window to break even on an Economy 7 plan compared to default single-rate price caps.
Frequently Asked Questions About UK Electricity Bills
What is the current UK electricity rate per kWh?
The Ofgem price cap for Q4 2025 sets the unit rate at approximately 24.50p per kWh for electricity. Actual rates vary by supplier and tariff type. Fixed-rate deals may be higher or lower than the cap depending on market conditions.
What is the standing charge on UK electricity bills?
The standing charge is a fixed daily fee (approximately 61.64p/day) that covers the cost of maintaining your electricity connection. You pay this regardless of how much electricity you use. It covers grid maintenance, metering, and supplier costs.
How much does the average UK household spend on electricity?
The average UK household spends approximately £80–£100 per month on electricity based on medium usage of ~242 kWh/month at price cap rates. Actual costs vary significantly by household size, heating type, and energy efficiency.
What is the Ofgem price cap?
The Ofgem price cap is a maximum unit rate and standing charge that energy suppliers can charge customers on default/variable tariffs. It's updated quarterly based on wholesale energy costs. It doesn't cap total bills — if you use more energy, you pay more.
Is UK electricity charged with VAT?
Yes, domestic electricity in the UK is subject to 5% VAT (reduced rate). This is applied to the total bill including both unit charges and standing charges. Business electricity may be charged at the standard 20% VAT rate.
What is Economy 7 electricity?
Economy 7 is a tariff with cheaper electricity for 7 hours overnight (typically midnight to 7am) and a higher rate during the day. It's designed for households with storage heaters or immersion heaters that can use electricity during off-peak hours.