About this calculator
What a heater, dehumidifier, compressor or any other load costs to run, by day, month and year.
How it’s calculated
kWh = watts ÷ 1,000 × hours. Cost = kWh × price per kWh.
Worked example
With these inputs:
- Power (watts)
- 2000
- Hours per day
- 4
- Days per month
- 30
- Price per kWh
- £0.25
the result is:
- Monthly cost
- £60.00
- Per day
- £2.00
- Per year
- £720.00
- kWh per year
- 2,880
Tips from the trade
- Check your bill for your actual unit rate. Time-of-use tariffs vary through the day.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and the Building Regulations before ordering.