How Much Does a Desktop Computer Cost to Run?
Desktop Computer running cost: about 5.3p per hour, or £54.75 a year with 20 hours a week, at the 26.32p per kWh Ofgem price cap.
| Per day (average) | £0.15 |
|---|---|
| Per week | £1.05 |
| Per month | £4.56 |
| Per year | £54.75 |
| Energy used per year | 208 kWh |
How we worked out the cost
We use a typical figure of 0.2 kWh per hour for a typical desktop PC and monitor at around 200 W. At 26.32p per kWh, that is 0.2 × 26.32p = 5.3p. Over a week of 20 hours it is £1.05, and over a year £54.75.
These are typical estimates rather than lab measurements. Your appliance may use more or less, so adjust the kWh in the calculator for your own.
Desktop Computer cost at different electricity prices
| Electricity price | Per hour | Per year (20 hours a week) |
|---|---|---|
| 20p per kWh | 4p | £41.60 |
| 25p per kWh | 5p | £52.00 |
| 26.32p per kWh (Ofgem cap) | 5.3p | £54.75 |
| 30p per kWh | 6p | £62.40 |
| 35p per kWh | 7p | £72.80 |
| 40p per kWh | 8p | £83.20 |
How to reduce the cost
- Use sleep mode and power-saving settings, and switch off at the wall overnight.
- Switch devices off at the wall rather than leaving them on standby.
- Lower screen brightness and use power-saving settings.
- Unplug chargers when not in use.
How does it compare?
| Appliance | Cost per use | Typical use | Per year |
|---|---|---|---|
| TV | 2.6p per hour | 28 hours/week | £38.32 |
| Games Console | 5.3p per hour | 10 hours/week | £27.37 |
| Laptop | 1.3p per hour | 20 hours/week | £13.69 |
| WiFi Router | 7.6p per day | 7 days/week | £27.78 |
| Phone Charger | 0.26p per full charge | 7 charges/week | £0.96 |
| Air Fryer | £0.16 per 20-minute use | 7 uses/week | £57.48 |
| Heated Clothes Airer | 7.9p per hour | 14 hours/week | £57.48 |
Based on the Ofgem price cap of 26.32p per kWh for 1 October to 31 December 2026. Ofgem states these figures do not include VAT from 1 October 2026 to 31 March 2027, because the Government has removed VAT from electricity bills for that period. The standing charge is not included. Source: Ofgem.
Frequently asked questions
How much does a desktop Computer cost to run per hour?
At the Ofgem price cap of 26.32p per kWh, a typical desktop Computer costs about 5.3p per hour, using around 0.2 kWh (a typical desktop PC and monitor at around 200 W).
How much does a desktop Computer cost to run for a year?
With 20 hours a week, it costs about £54.75 a year (£4.56 a month), using about 208 kWh. Change the numbers in the calculator above to match how you use yours.
Is the price cap the rate I actually pay?
Not necessarily. The cap is an average limit on default tariffs. Your own rate depends on your supplier, region and tariff, so check your bill and use the calculator to see the cost at your rate. Doubling the rate doubles the cost.
How accurate are these figures?
They are estimates for a typical modern appliance. Age, model, settings and how you use it all change the real cost, so treat them as a guide and check your appliance’s energy label for a precise figure.
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Figures are for the 2026/27 tax year from official sources and are estimates for guidance only, not financial or legal advice. Printed from ukanswers.co.uk.