Air Compressor Buying Guide: Tank Size and CFM Explained
An air compressor buying guide really only needs two numbers to get right: tank size and CFM (cubic feet per minute) output. Get those matched to what you're actually running and the rest is preference.
Tank size: buffer, not power
The tank doesn't make the compressor more powerful — it stores air so the motor doesn't have to run constantly. A small 6–16L tank suits quick jobs like tyre inflation and nail guns. A 25–50L tank gives you a bigger air buffer for tools that draw continuously, like spray guns or air ratchets, without the compressor cycling on and off constantly.
CFM: what actually powers your tools
Every air tool has a CFM requirement — check the tool's spec sheet, not just the compressor's. A compressor that can't keep up with a tool's CFM demand will lose pressure mid-use, which shows up as a spray gun spluttering or a nail gun losing punch. When in doubt, size the compressor to your highest-demand tool, not the average.
Oil-free vs oiled
Oil-free compressors (like the ones in our range) need less maintenance and are ready to use straight out of the box — ideal for home garages and light trade use. Oiled compressors run quieter and last longer under heavy continuous use, but need regular oil checks and changes.
Portability features worth having
Wheels and a handle matter more than people expect once the tank's full — a 50L compressor gets heavy fast. Twin outlets let two tools run off one compressor without swapping fittings constantly.
Browse the full range in Electric Air Compressors.
For general workplace equipment safety guidance, see Safe Work Australia.
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About the author: Ryan Griffiths is based in Newcastle, NSW, and works with the Toolaroo team helping tradies, farmers, and home workshop owners choose the right storage and equipment for their setup.