Electricity Usage Calculator
Estimate your home’s energy consumption and running costs. Calculate daily, monthly, and annual kWh usage for any appliance based on wattage and usage time.
Calculate Your Energy Consumption
Enter your appliance’s power rating and usage habits to see a realistic breakdown of its electricity consumption and estimated cost.
Appliance & Usage Details
Enter your device specifications
Consumption Evaluation
Estimated energy usage and running costs
Common Appliance Wattages
Average power consumption benchmarks for typical UK household appliances.
| Appliance | Typical Usage | Avg. Wattage |
|---|---|---|
| LED Light Bulb | 4 – 6 hours/day | 8W – 12W |
| Refrigerator / Freezer | 24 hours/day (cycles) | 100W – 200W |
| Laptop Computer | 4 – 8 hours/day | 50W – 100W |
| 4K Smart TV | 3 – 5 hours/day | 100W – 150W |
| Washing Machine | 1 hour, 3x per week | 500W – 2000W |
| Electric Space Heater | 2 – 4 hours/day | 1500W – 3000W |
Energy Usage FAQ
Everything you need to know about calculating and reducing your home electricity consumption.
To calculate electricity usage in kilowatt-hours (kWh), multiply the appliance’s power rating in watts by the number of hours it is used, then divide by 1,000. Formula: (Watts × Hours) ÷ 1,000 = kWh.
As of recent averages, the standard variable electricity rate in the UK is approximately 24p per kWh, though this can vary significantly depending on your supplier, region, and whether you are on a fixed or time-of-use tariff.
Yes, many appliances draw ‘phantom’ or ‘standby’ power when plugged in but not actively in use. Devices like TVs, computers, and phone chargers can account for up to 10% of a household’s annual electricity usage.
You can reduce usage by unplugging devices when not in use, switching to LED lighting, using energy-efficient appliances (rated A or higher), washing clothes at lower temperatures, and utilizing smart plugs or timers.