Fill the tank, then enter the distance since the last full tank and how much fuel went in.
This electricity cost calculator shows what your appliances cost to run per day, month and year. Enter your price per kWh, then list devices with their power in watts and hours of use per day, or pick common ones from the list. Each appliance’s share of the total shows where your power bill goes.
How to use
- Fuel cost: enter the distance (km or miles), your car’s consumption in L/100 km, km/L or mpg, and the fuel price per liter or gallon.
- Don’t know your consumption? Tap “From a fill-up” and enter the distance since the last full tank and the fuel you just added.
- Turn on Round trip to double the distance, and set People to split the cost.
- Electricity: enter your price per kWh, then list your appliances with their power in watts and hours of use per day. Pick a common appliance from the list or add your own.
- Totals per day, month and year appear at once, with each appliance’s share. Tap a result to copy it.
- Liters needed = distance × L/100 km ÷ 100. 1 US gallon = 3.785 L and 1 UK gallon = 4.546 L, so UK mpg figures are higher for the same car.
- Real-world consumption depends on speed, traffic, load and climate control; the official figure is usually optimistic.
- kWh = watts × hours ÷ 1,000. Fridges, freezers and heaters cycle on and off, so the preset uses an average power rather than the label maximum.
- Your price per kWh is on your electricity bill. Add standing charges and taxes separately if your bill has them.
- Your appliance list and units are saved in this browser.
From watts to dollars
Energy in kWh = power in watts × hours ÷ 1,000. Cost = kWh × price per kWh. A 100 W TV on for 5 hours a day uses 0.5 kWh; at $0.17 per kWh that is $0.085 a day, about $2.55 a month and $31 a year.
Find the wattage on the appliance label or in the manual. A plug-in energy meter gives the real figure, including standby.
Appliances that cycle
Fridges, freezers, heaters with thermostats and air conditioners switch on and off, so their label maximum overstates the cost. The presets use a typical average power instead. Your price per kWh is on your electricity bill; add fixed monthly charges and taxes separately if your bill has them. The appliance list is saved in this browser.
Frequently asked questions
How do I calculate the electricity cost of an appliance?
Multiply its watts by the hours of use and divide by 1,000 to get kWh, then multiply by your price per kWh.
How many kWh does a 1,500 W heater use?
1.5 kWh per hour. Used 4 hours a day, that is 6 kWh a day and about 180 kWh a month.
Where do I find my price per kWh?
On your electricity bill, usually as the energy or unit rate. If you have tiered or time-of-use rates, use an average.
Why is my bill higher than the total here?
Bills often add fixed daily or monthly charges, taxes and network fees. Standby power of devices you didn’t list also adds up.
Does standby power matter?
It can. A device drawing 5 W around the clock uses about 44 kWh a year, and many small chargers and set-top boxes add up.