kWh Electricity Cost Calculator
Running cost of an appliance from its wattage and usage.
Enter your values
Enter the appliance power in W.
Enter the hours used per day in hours.
Enter the electricity rate in $/kWh.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Daily cost
- $0.72
- Monthly cost
- $21.6
- Annual cost
- $262.8
- Daily energy use
- 4.5 kWh
Quick answer
Cost = watts / 1000 x hours used x price per kWh.
Cost = (W/1000) x hours x rate
At a glance
| What it does | Running cost of an appliance from its wattage and usage. |
|---|---|
| Category | Engineering |
| Inputs needed | Appliance power, Hours used per day, Electricity rate |
| Main output | Daily cost |
| Formula | Cost = (W/1000) x hours x rate |
| Cost | Free — no sign-up, no download |
How to use the kWh Electricity Cost Calculator
- 1Enter the appliance's power draw in watts (check the nameplate or a plug-in meter).
- 2Enter typical daily hours of use.
- 3Enter your electricity rate to see daily, monthly and annual cost.
Inputs explained
- Appliance power(W)
- Enter the appliance power in W.
- Hours used per day(hours)
- Enter the hours used per day in hours.
- Electricity rate($/kWh)
- Enter the electricity rate in $/kWh.
Worked example
Using the values the calculator loads with:
Inputs
- Appliance power1500 W
- Hours used per day3 hours
- Electricity rate0.16 $/kWh
Results
- Daily cost$0.72
- Monthly cost$21.6
- Annual cost$262.8
- Daily energy use4.5 kWh
Frequently asked questions
Where do I find my electricity rate?
Check a recent utility bill; it's usually listed per kWh, sometimes with tiered pricing.
Does standby power matter?
Yes — many devices draw a small standby load 24/7 that adds up; measure with a plug meter for accuracy.
What do I need to enter into the kWh Electricity Cost Calculator?
Just 3 values: appliance power, hours used per day, electricity rate. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the kWh Electricity Cost Calculator work out the answer?
Cost = watts / 1000 x hours used x price per kWh. It applies the formula Cost = (W/1000) x hours x rate and shows the working so you can check each step by hand.
Is the kWh Electricity Cost Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.