One Rep Max Calculator — Free 1RM & Bench Press Calculator

One rep max calculator for strength training — free 1RM, bench press and strength calculator. INTRODUCTION Estimate your one-rep max with Trencada's free 1RM calculator. Enter the weight you lifted and the reps you completed, and get your estimated max plus a training percentage chart and rep estimates per zone. Four proven formulas included: Epley, Brzycki, Lander and Lombardi. Runs entirely in your browser — no signup needed. HOW TO USE 1. Enter the weight you lifted and how many reps you completed (1–36). 2. Choose kg or lb, the formula (Epley is the most common), and your lift. 3. Click Calculate 1RM to see your estimated max, a percentage training chart, and estimated reps per zone. 4. Formulas are estimates — always train safely and prefer a spotter for true max attempts. KEY FEATURES - Four 1RM formulas: Epley, Brzycki, Lander, Lombardi. - Training percentage chart (50–95% of 1RM) with typical uses. - Rep-estimate chart per intensity zone. - kg and lb support; bench press, squat, deadlift, overhead press presets. - 100% client-side — nothing uploaded or stored. WHY CHOOSE TRENCADA No signup, no paywall, no app to install. The one rep max calculator works entirely in your browser and gives you programming-ready numbers for every major lift — the strength-training companion powerlifters and beginners both need. FAQ 1. Is the one rep max calculator really free? Yes — unlimited calculations, free forever, no account needed. 2. Which formula should I use? Epley is the standard for most lifters; Brzycki is popular for higher rep ranges. 3. How accurate is the estimate? Within a few percent for rep ranges under 10 — treat it as a training guide, not a guarantee. 4. Is my data uploaded anywhere? No — everything runs locally in your browser.