1RM Calculator & Strength Log

About this app

Know your one-rep max without ever grinding out a dangerous single. Enter any working set — the weight you lifted and how many clean reps you got — and OneRepMax instantly estimates the heaviest single you could hit today. Most 1RM apps run one formula and call it a day. OneRepMax cross-checks seven proven strength-science equations — Epley, Brzycki, Lombardi, Lander, O'Conner, Mayhew and Wathan — and gives you a blended average so your number holds up whether you tested at 3 reps or 12. Then it turns that max into a full percentage table: the exact load for warm-ups, 5x5 strength work, and hypertrophy sets, in kg or lb. WHAT YOU GET - A trustworthy one-rep max from seven validated formulas, not a single guess - A complete percentage table with warm-up ramp and training loads for every set - Per-lift logging for squat, bench, deadlift and press with personal-record tracking - Trend charts that show your estimated max climbing week over week - A Beginner-to-Elite strength level scored from your bodyweight for each lift - A Learn library explaining the formulas, programming and how to test safely, with cited sources PERFECT FOR - Powerlifters programming their next block around accurate maxes - Lifters running 5x5, 5/3/1 or any percentage-based plan - Gym-goers who want to load the bar right without maxing out - Coaches and beginners learning what the numbers actually mean WHY NOT JUST USE A FREE WEB CALCULATOR? A web box gives you one number from one formula and forgets it the second you close the tab. OneRepMax keeps your history for every lift, blends seven equations for a number you can trust, builds your whole training table around it, and charts your progress over months — all offline. PRIVACY Your lifts and bodyweight stay on your device. No account, no sign-up, nothing uploaded. FULL ACCESS A free estimate is always available. Full access unlocks all seven formulas plus the blended average, per-lift logging with PRs, trend charts, and the bodyweight strength-level estimate. Upgrade weekly, yearly, or once with a lifetime purchase. Load the bar with the right weight this session — open OneRepMax and enter your last set. Terms of Use (EULA): https://web-levi.web.app/terms Privacy Policy: https://web-levi.web.app/privacy-policy Questions? tphuc.work@gmail.com

Bug fixes and performance improvements.

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1. First observed Aug 21, 2026 · 3:31 AM Free