Fan Energy Cost Calculator
Running cost of a fan per day, month and year.
Enter your values
Enter the fan power in W.
Enter the hours per day in h.
Enter the electricity rate in per 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
- 0.37
- Monthly cost
- 11.18
- Annual cost
- 134.03
- Annual kWh
- 745
- Cost per 1000 CFM-hours
- varies with fan efficiency
Quick answer
Fan running cost is watts times hours divided by 1,000, multiplied by your electricity rate.
cost = W x hours / 1000 x rate
At a glance
| What it does | Running cost of a fan per day, month and year. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Fan power, Hours per day, Electricity rate |
| Main output | Daily cost |
| Formula | cost = W x hours / 1000 x rate |
| Cost | Free — no sign-up, no download |
How to use the Fan Energy Cost Calculator
- 1Enter the fan's actual input watts, not the motor nameplate horsepower.
- 2Set the hours per day it really runs.
- 3Compare an ECM upgrade against the annual figure to see payback.
Inputs explained
- Fan power(W)
- Enter the fan power in W.
- Hours per day(h)
- Enter the hours per day in h.
- Electricity rate(per kWh)
- Enter the electricity rate in per kWh.
Worked example
Using the values the calculator loads with:
Inputs
- Fan power85 W
- Hours per day24 h
- Electricity rate0.18 per kWh
Results
- Daily cost0.37
- Monthly cost11.18
- Annual cost134.03
- Annual kWh745
- Cost per 1000 CFM-hoursvaries with fan efficiency
Frequently asked questions
ECM vs PSC savings?
An ECM blower often uses a third of the watts of a PSC at low speed, saving 200-400 kWh a year.
Does speed control help?
Hugely — halving speed cuts power to about an eighth.
What do I need to enter into the Fan Energy Cost Calculator?
Just 3 values: fan power, hours 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 Fan Energy Cost Calculator work out the answer?
Fan running cost is watts times hours divided by 1,000, multiplied by your electricity rate. It applies the formula cost = W x hours / 1000 x rate and shows the working so you can check each step by hand.
Is the Fan Energy 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.