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
- R0
the result is:
- Monthly cost
- R0.00
- Per day
- R0.00
- Per year
- R0.00
- 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 SANS 10400 (the National Building Regulations) and your local municipality before ordering.