One Rep Max Calculator
Enter weight and reps to find your estimated 1RM and full training percentage table.
Enter the weight you lifted and the number of reps to estimate your one-rep maximum (1RM) using four industry-standard formulas: Epley, Brzycki, Lombardi, and O'Conner. Also shows a full percentage table for programming your training sets.
Advertisement
Last reviewed: April 2026Report an error
Estimated 1RM
258.3 lbs
Estimated 1RM: 258.3 lbs (avg of Epley 262.5, Brzycki 253.1, Lombardi 264.3, O'Conner 253.1).
Epley
262.5 lbs
Brzycki
253.1 lbs
Lombardi
264.3 lbs
O'Conner
253.1 lbs
Training Percentage Table
100%
258.3 lbs
95%
245.3 lbs
90%
232.4 lbs
85%
219.5 lbs
80%
206.6 lbs
75%
193.7 lbs
70%
180.8 lbs
65%
167.9 lbs
60%
155.0 lbs
50%
129.1 lbs
Advertisement
How to Use This 1RM Calculator
- Enter the weight you lifted (in lbs or kg).
- Enter the number of reps you completed (1–30).
- Read your estimated 1RM from the average of four formulas.
- Use the percentage table to program your training sets at 50–100% of 1RM.
Frequently Asked Questions
- No single formula is best for everyone. Epley and Brzycki are the most widely cited. The average of all four formulas reduces the error of any single formula. For the most accurate 1RM, attempt the actual lift with proper warm-up.
- Above ~10 reps, 1RM estimates become less accurate because endurance factors start to dominate over pure strength. Estimates beyond 20–30 reps are unreliable.
Advertisement
Related Calculators
</> Embed this calculator on your website
<iframe src="https://calqpro.com/calculators/one-rep-max-calculator" width="100%" height="600" frameborder="0" title="Calqpro Calculator" loading="lazy"></iframe> <p>Powered by <a href="https://calqpro.com">Calqpro</a></p>
Advertisement