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1-Rep Max Calculator: Estimate Your True Strength

Barbell with weight plates in a dark gym, chalk dust lit by a lime-green rim light β€” strength training guide

Testing a true one-rep max is one of the riskiest things you can do in a gym β€” no spotter, one rep, everything on the line. Yet you need the number to program intelligently. The Epley formula solves that: it estimates your 1RM from a sub-maximal set you can do safely, using the relationship between reps and fatigue. This calculator also gives you the 90% training max, the number you should actually program from.

⚑ Free instant check

Estimate your one-rep max from a heavier set of 3-12 reps using the Epley formula β€” without risking a max-out attempt.

❓ 1-Rep Max Calculator: Estimate Your True Strength β€” FAQ

How accurate is the Epley 1RM formula?

Within a few percent for sets of 3-12 reps in most lifters. Above 12 reps it overestimates β€” that rep range is endurance, not strength.

Should I train at my estimated 1RM?

No β€” program from the 90% training max. It gives you recovery room and lets you add weight weekly instead of grinding near-fail singles.

What is a good strength level for my bodyweight?

A decent male benchmark is a bodyweight bench press, 1.5x bodyweight squat and 2x deadlift. Compare lifts to bodyweight, not to other people's numbers.

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Educational guidance only — not medical advice. We are not a medical provider; calculators give estimates, never diagnoses or guarantees. See a doctor before starting a new training or diet plan. Refunds honoured.
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