Each compressor has a CFM (cubic feet per minute) or SCFM (standard cubic feet per minute) rating, which is the measurement of the volume of air that is moved. If you already own air tools, such as a nailer or impact wrench, make sure to look for a compressor with a CFM or SCFM rating that matches at least the highest rating on your tools.
It is often recommended that your compressors SCFM be rated about 30% above your tools requirement, to ensure the performance of your tools without overworking the compressor.
If you’re planning to use multiple tools at once, look for a compressor that has a SCFM rating that is equal to the combined ratings of your tools plus another 30%.
Also check that the couplers on the air compressor are the right size, and that there are enough couplers, if you plan to run more than one tool at a time.