Electricity is billed in kilowatt-hours. A 1,000 W appliance running for one hour uses 1 kWh. Knowing the cost of each appliance helps decide which to replace or use less – heating, cooling and anything that runs around the clock add up quickly.
How to use the Electricity Cost Calculator
- Power consumption
- Usage per day
- Days used per week
- Quantity
- Electricity price
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the appliance power, how many hours a day and days a week it runs, the number of identical appliances and your price per kWh.
Tips
- Use the figures from your own bills and product labels – prices and appliance ratings vary widely.
- Look at yearly totals: small daily costs add up and make it easier to compare options.
- Round quantities up to whole packs, rolls or bulbs when you shop.
- Re-check the numbers when prices change; most results scale directly with the unit price.
Common mistakes to avoid
- Confusing watts (power) with watt-hours or kilowatt-hours (energy).
- Comparing prices without bringing them to the same unit first.
- Ignoring one-off costs such as installation, delivery or replacement parts.
Inputs explained
| Field | What to enter |
|---|---|
| Power consumption | Units: W, kW, hp |
| Usage per day | In h |
| Days used per week | A number |
| Quantity | A number |
| Electricity price | Units: /kWh |
What each result means
- Energy per day of use = [Power consumption]×[Usage per day]×[Quantity]÷1000
- Cost per day of use = [Energy per day of use]×[Electricity price]
- Cost per month = [Cost per day of use]×[Days used per week]×52.18÷12
- Cost per year = [Cost per day of use]×[Days used per week]×52.18
- Energy per year = [Energy per day of use]×[Days used per week]×52.18
Example values
How the main result changes when Power consumption changes and everything else stays at the example values above:
| Power consumption (W) | Cost per year |
|---|---|
| 500 | 87.66 |
| 750 | 131.49 |
| 1,000 | 175.32 |
| 1,250 | 219.16 |
| 1,500 | 262.99 |
| 2,000 | 350.65 |
Formula
Energy (kWh) = power (W) × hours ÷ 1,000Cost = energy × price per kWhYearly = daily × days used per week × 52.18Worked example
Inputs — Power consumption: 1,000 W; Usage per day: 3 h; Days used per week: 7; Quantity: 1; Electricity price: $0.16 /kWh.
Results — Energy per day of use = 3 kWh; Cost per day of use = $0.48; Cost per month = $14.61; Cost per year = $175.32; Energy per year = 1,096 kWh.
Frequently asked questions
How much does it cost to run a 1,000 W heater?
1 kWh per hour – 16 cents an hour at $0.16/kWh, or about $1.44 for 9 hours.
How do I find an appliance's wattage?
Check the rating label (W or VA) or multiply volts × amps.
What is the average electricity price?
In the U.S. about 16–17 cents/kWh for homes in 2024–2025; prices vary widely by state and country.
What formula does the Electricity Cost Calculator use?
Energy (kWh) = power (W) × hours ÷ 1,000.