Welder vs. air compressor: running cost
A welder is cheaper to run: about $7 a year versus $7 for an air compressor at typical use and 17.99¢/kWh, a $0 difference.
| Welder | Air compressor | |
|---|---|---|
| Typical watts | 2,400 W | 1,500 W |
| Watt range | 1,500–9,000 W | 150–4,000 W |
| Typical use | 1 hour a day, 1 days a week | 1 hour a day, 1 days a week |
| Energy per year | 38 kWh | 39 kWh |
| Cost per hour | 13¢ | 13¢ |
| Cost per day | 1.9¢ | 1.9¢ |
| Cost per month | $0.56 | $0.59 |
| Cost per year | $7 | $7 |
| Per year in Hawaii (43.51¢) | $16 | $17 |
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What drives the difference
- Welder: MIG welders on 120 V draw up to 20 A while the arc is on; arc-on time is typically 20-40% of a session, so duty is lower.
- Air compressor: Pancake compressors draw 12-15 A while running; they cycle on and off with tool use, so average draw is about half rated.
Ways to cut either cost
Inverter MIG welder
Inverter welders waste less energy as heat than transformer welders.
See options on Amazon Air hose leak-free fittings
Tight couplers stop leaks that make the compressor cycle.
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Frequently asked questions
Which costs more to run, a welder or an air compressor?
At typical use and the U.S. average rate (17.99¢/kWh), an air compressor costs about $7 a year versus $7 for a welder. That's $0 more.
How many watts do welder and air compressor use?
A welder typically draws 2,400 W (range 1,500–9,000 W). An air compressor draws 1,500 W (range 150–4,000 W). Watts alone don't decide cost. Hours of use, cycling and standby matter just as much.
Rates: EIA, 12 months ending 2026-07. Methodology.