Strength tool
One rep max calculator
Estimate your one-rep max (1RM) from a weight you lifted and the reps you managed, using the Epley and Brzycki formulas — plus a table of training percentages.
- Epley
- 116.7 kg
- Brzycki
- 112.5 kg
- 90% (≈3–4 reps)
- 103.1 kg
- 80% (≈8 reps)
- 91.7 kg
- 70% (≈12 reps)
- 80.2 kg
Average of Epley & Brzycki. Most accurate at 8 reps or fewer.
The basics
What is One Rep Max?
Your one-rep max (1RM) is the most weight you can lift for a single rep. Rather than risk a true max, you can estimate it from a lighter set taken close to failure. We use the Epley and Brzycki formulas and give you common training percentages (for programming your working sets). Estimates are most accurate at lower rep ranges (≤8 reps).
How to use it
- 1Enter the weight. Input a weight you lifted for multiple clean reps.
- 2Enter the reps. Input how many reps you managed (ideally 8 or fewer for accuracy).
- 3Read your 1RM. Your estimated max and training percentages appear instantly.
FAQ
One Rep Max Calculator — questions
How do I calculate my one rep max?
Take a weight you lifted for a known number of reps and apply a formula. Epley: 1RM = weight × (1 + reps ÷ 30). This calculator averages Epley and Brzycki for you.
What's the best programme to increase my 1RM?
Structured periodisation with progressive overload and a planned peak. Our strength programme builds exactly that around your starting numbers.
Put it to work
Turn your number into a plan
A calculator gives you a number. Coaching turns it into a programme that adapts to your data — start with the guide and the matching programme.
Ready to put your numbers to work?
Start with a free consultation. Tell us your goal and your data — we’ll show you the path. No pressure, no spam.