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Use a tread depth indicator or gauge. You can use a special tread depth indicator or gauge tool to measure your tire's tread. If you don't already own one, the gauge is cheap to purchase from an auto parts dealer and it's easy to use. You may be able to find a downloadable tread depth gauge by searching online.
How to check your tire tread depth. Tire tread depth gauges are a fast and easy way for you to know for sure if your tires are safe or if they need to be replaced. Find the shallowest groove of the tread and insert the pin of the gauge until the base is flush with the tire.