kWh Calculator
Enter the appliance’s power, hours of use per day and number of days to get kWh. The rate per kWh is optional and you enter it yourself.
This result is an estimate only. Check with your bank or the relevant authority before making decisions.
How it is calculated
- kWh = watts × hours ÷ 1000
- Total kWh = daily kWh × number of days
- Cost = total kWh × the rate you enter
The rate is optional. If it is empty, the cost shows as RM 0.00.
Worked example
An appliance of 1500 W, 8 hours a day, for 30 days:
- 1500 × 8 ÷ 1000 = 12 kWh per day
- 12 × 30 = 360 kWh
- If the rate you enter is RM 0.50 per kWh: 360 × 0.50 = RM 180.00
Why your number may differ
Use the rate from your electricity bill, because tariffs are tiered, so a single rate is only an estimate.
Frequently asked questions
How is kWh calculated?
kWh = watts × hours ÷ 1000. Multiply by the number of days for the whole period.
Which rate should I enter?
Use the rate from your electricity bill, because tariffs are tiered. The rate is optional; leave it empty if you only want the kWh.
Where do I find the wattage?
It is usually printed on the appliance label or in the manual.