Appliance Energy Cost
Estimate the monthly and yearly cost of running an appliance.
About Appliance Energy Cost
To find running cost, convert the wattage and usage into kilowatt-hours, then multiply by the electricity rate. Running the appliance every day compounds into a clear monthly figure. Many households underestimate how much high-wattage appliances cost, so converting watts to a monthly bill makes wasteful habits visible.
Formula
Appliance Energy Cost
Monthly energy = watts x hours x days / 1000; cost = energy x rate
- watts
- The appliance power rating in watts
- rate
- Price of a kilowatt-hour
Worked example
With the default values below, Appliance Energy Cost returns Monthly Energy of 96.0. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Power ratingminimum 0 watts
- 800 watts
- Use per dayminimum 0 hours
- 4 hours
- Days per monthminimum 1
- 30
- Electricity rateminimum 0 $/kWh
- 0.15 $/kWh
Results
- Monthly Energy
- 96.0 kWh
- Monthly Cost
- $14.40
- Annual Cost
- $172.80
- Cost per Day
- $0.4800
Step by step
- 1Values used
- 2Appliance Energy Cost
- 3Monthly Energy= 96.0 kWh
- 4Monthly Cost= 14.40
- 5Annual Cost= 172.80
- 6Cost per Day= 0.4800
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Appliance Energy Cost calculated?
Monthly energy = watts x hours x days / 1000; cost = energy x rate To find running cost, convert the wattage and usage into kilowatt-hours, then multiply by the electricity rate. Running the appliance every day compounds into a clear monthly figure.
Why does Appliance Energy Cost matter?
Many households underestimate how much high-wattage appliances cost, so converting watts to a monthly bill makes wasteful habits visible.
What values do I need to enter?
This calculator takes 4 inputs: Power rating, Use per day, Days per month, Electricity rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.