How many watts does an air purifier use?
An air purifier uses 25–100 W (about 50 W on average). Running 8 hours/day, that is about 0.40 kWh a day and 12.0 kWh a month — roughly $2.20 a month at the U.S. average rate of 18.31 ¢/kWh.
This is the air purifier electricity usage reference: watts, amps on a 120 V circuit, the kWh math, and links to what that usage costs in each state.
Watts, amps, and kWh for an air purifier
| Measure | Value |
|---|---|
| Rated wattage range | 25–100 W |
| Average draw used in our math | 50 W |
| Amps at 120 V | 0.2–0.8 A (0.4 A at the average draw) |
| kWh per hour | 0.05 kWh |
| kWh per day at 8 hours/day | 0.40 kWh |
| kWh per month | 12.0 kWh |
| Cost per month at the U.S. average (18.31 ¢/kWh) | $2.20 |
The math is kWh = watts × hours ÷ 1000 and amps = watts ÷ volts. A standard 120 V household circuit on a 15 A breaker carries about 1,800 W. For the dollars in your state, open cost to run an air purifier in Texas and switch states from there.
Air Purifier electricity usage profile
| Metric | Value |
|---|---|
| kWh per hour | 0.05 kWh |
| kWh per day (typical) | 0.40 kWh |
| kWh per month (typical) | 12.0 kWh |
| kWh per year (typical) | 146.0 kWh |
| Low runtime scenario | 4 hours/day |
| High runtime scenario | 12 hours/day |
Connect usage to cost tools
Related appliance usage pages
Source & Method
Source: U.S. Energy Information Administration (EIA) Retail Sales of Electricity. Last dataset period: July 2026. Usage calculations use fixed appliance wattage and runtime assumptions so results stay comparable across pages.
Frequently asked questions
How many watts does an air purifier use?
An air purifier uses 25–100 W (about 50 W on average). Our usage and cost math uses 50 watts running 8 hours/day.
How many amps does an air purifier draw?
On a 120 V circuit, 25–100 W works out to about 0.2–0.8 A; at the 50 W we use in the math that is 0.4 A.
How much electricity does an air purifier use per month?
About 12.0 kWh a month at 8 hours/day. Lighter use (4 hours/day) comes to roughly 6.0 kWh and heavier use (12 hours/day) roughly 18.0 kWh.
How much does it cost to run an air purifier?
About $2.20 a month at the U.S. average rate of 18.31 ¢/kWh — from roughly $1.53 in Louisiana to $5.76 in Hawaii at the same usage. The state cost-to-run pages price it at every state's rate.