Estimate the monthly and annual electricity cost of a radon fan using its running watts and your electricity bill rate.
Advanced options
Table of contents
How to use our Radon Fan Electricity Cost Calculator
- Enter the fan's running power from its label, manual, installation paperwork, or a plug-in watt meter.
- Choose one bill rate if you know your total charge per kWh, or choose separate bill charges to add supply, delivery, and other per-kWh charges.
- Leave the run time at 24 hours per day and 365 days per year unless you have a documented operating schedule.
- Select Calculate, then check that the Electricity usage rate used includes all charges billed per kWh but does not include a fixed monthly customer charge.
- Use Estimated annual fan electricity cost for yearly budgeting and Estimated average monthly fan electricity cost for a monthly bill estimate.
Definitions
Running power (W): The electrical power the fan uses while operating, measured in watts.
Kilowatt-hour (kWh): A unit of electricity use. A 1,000 W device running for one hour uses 1 kWh. [2]
Electricity usage rate: The price charged for each kWh. It can include supply, delivery, taxes, and riders when those items are billed per kWh.
Supply charge: A per-kWh charge for generating or buying electricity.
Delivery charge: A per-kWh charge for moving electricity through transmission and distribution equipment.
Fixed monthly customer charge: A set account charge that does not change with kWh use. It is excluded from fan-only cost.
Common mistakes and quick fixes
Mistake: Entering the fixed customer or service charge in Electricity rate.
Fix: Include only charges billed per kWh in Electricity rate. Fixed monthly charges are not caused by the fan.
Mistake: Entering only the supply price when using separate charges.
Fix: Add each applicable per-kWh bill line in Supply charge, Delivery charge, and Other charges billed per kWh.
Mistake: Using the fan's model number instead of Fan running power.
Fix: Enter watts from the fan label or manual, or use a plug-in watt meter to find actual running power.
Mistake: Treating Estimated average monthly fan electricity cost as the exact amount on every bill.
Fix: It is Estimated annual fan electricity cost divided by 12, so billing days and electricity rates can make actual monthly charges differ.
Mistake: Changing Run time without a documented schedule.
Fix: Keep Run time at 24 hours per day and 365 days per year unless system instructions or qualified guidance gives a different schedule.
Limitations & Key Assumptions / Boundary Conditions
- The estimate assumes Fan running power stays constant whenever the fan runs. A watt-meter reading can differ from a label value.
- Estimated average monthly fan electricity cost is annual cost divided by 12. It does not match a specific billing period with a different number of days.
- Only charges billed per kWh belong in the electricity usage rate. Fixed customer, basic, and service charges are excluded because the account would usually pay them without the fan.
- The calculator estimates electricity use and usage-dependent electricity cost only. It excludes fan purchase, installation, repair, replacement, and any change in utility rates.
- Run time defaults to continuous operation. A changed schedule is a calculation input, not advice to turn a radon fan off.
Methodology
Calculation method
The calculator first finds the electricity price to apply. With one bill rate, it uses Electricity rate. With separate charges, it adds Supply charge, Delivery charge, and Other charges billed per kWh. Fixed monthly account charges are left out.
effective usage rate = electricity rate
effective usage rate = supply charge + delivery charge + other usage rate
It converts watts to kilowatts, then multiplies by daily run time and operating days to estimate yearly electricity use.
annual electricity use = (fan running power / 1000) * run time hours per day * run time days per year
The yearly cost is yearly kWh multiplied by the electricity usage rate. The monthly figure is a 12-month average.
annual fan electricity cost = annual electricity use * effective usage rate
average monthly fan electricity cost = annual fan electricity cost / 12
Worked example
For a 60 W fan running 24 hours per day for 365 days, annual use is 525.6 kWh. At $0.1811 per kWh, annual cost is $95.19 and average monthly cost is $7.93. The starting 60 W and $0.1811 per kWh values are planning estimates; replace them with your fan and bill values. [1]
Calculation choices
Rates must be zero or greater, and run time must be from 0 to 24 hours per day and 0 to 366 days per year. If run time is zero, electricity use and cost are zero. The calculation stops for blank, invalid, negative, or non-finite required values.