Most air tools for home use operate between 0-5 Cubic Feet per Minute (CFM) and 70 - 90 PSI. You will find some (like air sanders) that run at 8 - 12 CFM and 100 - 120 PSI. It's important that you check the specs of commonly used tools. Feel free to refer to this CFM chart. A 6 - 8 gallon air compressor will be suitable for the majority of your home needs. This should provide plenty of air to power most small air tools. If you frequently use larger air tools like impact drivers and grinders, we recommend you bump up to a larger 20-gallon air compressor or you will be disappointed by the delay between tasks with the smaller tank compressors.