Max Bench

I don't bench with a spotter, so I was wondering if there is a mathmatical equasion to find my one rep max. Today I lifted 135lbs 10 times before I dropped it on myself. Is there a way to find a one rep max with this info?
 
Smoke from a grid i have.... if your able to rep a weight 10 times its about 74% of your 1RM, if you actually calculate it your 1RM would be 185 lbs.
 
It varies from person to person. The only way to truly know is to get a spotter and try it for yourself.
scott
 
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