Verified Formula, Methodology & Frequently Asked Questions: One-Rep Max (1RM) Bench, Squat & Deadlift Percentage Calculator
Estimate your true 1-Rep Max and full 70%–95% working weight chart using the combined Epley and Brzycki strength equations.
Verified Mathematical Equation: Epley 1RM = Weight × (1 + Reps/30); Brzycki 1RM = Weight × [36 / (37 − Reps)]
Frequently Asked Questions (FAQ)
How does the One-Rep Max (1RM) Bench, Squat & Deadlift Percentage Calculator work in 2026?
Estimate your true 1-Rep Max and full 70%–95% working weight chart using the combined Epley and Brzycki strength equations. It uses the industry-standard formula (
Epley 1RM = Weight × (1 + Reps/30); Brzycki 1RM = Weight × [36 / (37 − Reps)]) and updates your KPIs, visual breakdown bar, and comparison table at 60fps as you type or drag the sliders.How can I share my exact scenario with a client, partner, or spouse?
Click the 🔗 Share Scenario Link button at the top of the page. It encodes every input you entered directly into a custom URL so anyone who clicks your link sees your exact numbers immediately.
Is my financial data private and does this work offline?
Yes—100% of calculations happen locally inside your browser using JavaScript. No personal or financial inputs are ever transmitted to an external database.
Can I embed the One-Rep Max (1RM) Bench, Squat & Deadlift Percentage Calculator on my own website or client portal?
Yes! Click </> Embed on Your Site (Free) above to copy a clean, responsive
<iframe> widget that automatically adapts to any screen size.