Estimate your one rep max (1RM) based on the weight you can lift for multiple reps.
Advertisement
Enter Your Measurements
Results
Estimated 1RM
216
lbs
Advertisement
Formula
1RM = Weight × (1 + Reps / 30)
How to Use This Calculator
How to Use
- 1
Enter the weight you lifted.
- 2
Enter the number of reps you did.
- 3
Get your estimated one rep max.
Frequently Asked Questions
Frequently Asked Questions
Is this estimate accurate?
This Epley formula is reasonably accurate for 1-10 reps. More reps = less accuracy. For best results, test your actual 1RM.
Why estimate instead of testing?
Testing 1RM is stressful on your body. Estimating lets you track progress without injury risk.
Advertisement
Related Calculators
Related Calculators
About This Calculator
This calculator uses the formula: 1RM = Weight × (1 + Reps / 30). All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
▶Embed this calculator on your website
Copy and paste this code into your page:
<iframe src="https://calcsmart.io/embed/one-rep-max-calculator" width="100%" height="520" frameborder="0" style="border-radius:8px;border:1px solid #e5e7eb" title="One Rep Max Calculator"></iframe>Free to embed. Attribution link included automatically.