Electricity Cost Calculator
Estimate what each appliance costs to run per day, month and year.
Example numbers are filled in so you can see how it works. Replace them with yours.
From your bill: the price per unit
Standby and quantity
Power used when plugged in but off
Standby and quantity
Power used when plugged in but off
Standby and quantity
Power used when plugged in but off
Result
Enter your rate and an appliance’s power and hours of use.
Recent
How electricity cost is calculated
kWh = watts × hours ÷ 1,000 · cost = kWh × rate
For example, a 1500 W air conditioner used 8 hours a day for 30 days uses 360 kWh a month. At 8 per kWh that’s about 2,880 a month.
These are estimates. Real bills add fixed charges and taxes, and slab tariffs charge more as use rises. Fridges and air conditioners cycle on and off, so their actual use is often lower than their rated power suggests.
Questions
How do I find an appliance’s wattage?
Look for a label or plate on the back or underside, or in the manual. It’s written in watts (W) or kilowatts (kW; 1 kW = 1,000 W). The presets give typical values you can adjust.
Why might my bill be different?
Bills often include fixed charges, taxes and duties, and many tariffs charge a higher rate as you use more (slabs or tiers). Appliances like fridges and air conditioners also cycle on and off, so their real use depends on the weather and settings.
What is standby power?
Power an appliance draws while plugged in but switched off or idle, such as a TV on standby or a charger left in the socket. It’s counted for every hour the appliance isn’t in use.
What rate should I use?
Your price per unit (kWh) from your electricity bill. If your tariff has slabs, use the rate for the slab you usually reach.