Free online 1rm calculator
One Rep Max Calculator
One-rep max calculator using the Epley formula, plus training percentages.
- Free · No signup
- Instant results
- Private in your browser
- Works on mobile
Result
Estimate one-rep max from a submaximal set (Epley).
About this 1rm calculator
Estimate your 1RM from a submaximal set and see common training percentages (65–95%) for programming.
Use this free online one rep max calculator when you need a quick, clear estimate without creating an account. Calculations run in your browser on Toolwright, so your inputs stay private. Results are for education and planning — confirm important financial, tax, or health decisions with a qualified professional.
How to use the One Rep Max Calculator
- Enter the values asked for in the form — amounts, rates, dates, or measurements depending on the tool.
- Tap calculate to see your result instantly. Adjust inputs anytime to compare scenarios.
- Review the breakdown and FAQs below if you want more context on what the numbers mean.
Why people use Toolwright
- Clear answers — dedicated page for the one rep max calculator, built to load fast and stay easy to read.
- Fast & free — no paywall, no email gate, results above the noise.
- US-ready — copy and units aimed at American and Western users.
- One toolkit — jump to related fitness & health tools without leaving the site.
One Rep Max Calculator FAQ
Which formula is used?
Epley: weight × (1 + reps/30). Best for roughly 1–10 reps.