A 90 lb jackhammer (pavement breaker) needs about 90 CFM at 90 to 100 PSI, so a 185 CFM towable air compressor runs two of them at the same time. Smaller breakers use less air, so the same compressor can run more of them. For larger crews, add up the air each tool uses and choose a compressor with some margin above the total.
Air needed by breaker size
| Tool | Approx. air use | Tools per 185 CFM compressor |
|---|---|---|
| 30 lb breaker | 35 to 45 CFM | Up to 4 |
| 60 lb breaker | 55 to 70 CFM | 2 to 3 |
| 90 lb breaker | 80 to 95 CFM | 2 |
| Rock drill | Varies widely by model | Check the tool data |
These are typical figures. Always check the air consumption printed in your tool’s manual, because it changes with brand and model.
How to size the compressor
- Add the CFM of every tool that runs at the same time. Two 90 lb breakers are about 180 CFM.
- Check the pressure. Most breakers work at 90 to 100 PSI. The compressor must deliver its rated CFM at that pressure.
- Allow for hose losses. Long or narrow hoses reduce pressure at the tool. Use 3/4 in hose for breakers and keep runs as short as practical.
- Leave margin. A compressor working at its limit all day runs hotter and wears faster.
Why 185 CFM is the standard jobsite size
A 185 CFM diesel compressor covers the most common setup, two breakers, in a unit that tows behind a pickup. That is why it is the size most contractors and rental fleets use. If you also plan to sandblast or run more tools, compare it with the larger size in 185 CFM vs 375 CFM.
Used 185 CFM units in our inventory have been listed from $9,900 to $17,800, with most between $11,000 and $12,000.
Frequently asked questions
Can a small shop compressor run a jackhammer?
No. Electric shop compressors deliver far less air than a pavement breaker uses continuously. Breakers need a towable rotary screw compressor.
What PSI does a jackhammer need?
About 90 to 100 PSI at the tool. More pressure does not make it hit harder and can damage it.
How many jackhammers can a 375 CFM compressor run?
About four 90 lb breakers, with the same rule: add up the real consumption of your tools.
See our used 185 CFM air compressors for sale or all towable air compressors.
