Estimate your one-rep max (the maximum weight you can lift once) based on the weight and reps you performed.
Estimate your one-rep max (the maximum weight you can lift once) based on the weight and reps you performed.
Epley: 1RM = Weight × (1 + 0.0333 × Reps)
Bench press 80 kg for 8 reps → Estimated 1RM ≈ 101 kg.
Enter your values in the fields above and click "Calculate" to get instant results. All calculations happen in your browser — nothing is sent to any server.
What is One-Rep Max Calculator?
Estimate your one-rep max (the maximum weight you can lift once) based on the weight and reps you performed.
What formula does this use?
This calculator uses: Epley: 1RM = Weight × (1 + 0.0333 × Reps)
Is this calculator free?
Yes! All calculators on CalcNest AI are 100% free with no account required.
Is my data safe?
Absolutely. All calculations run locally in your browser. We never store or transmit your input data.