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Preparing your tools for maximum speed.
Welcome to the One Rep Max. Calculate one rep max from reps and weight. Whether you are a professional or just need a quick utility, our tool is designed to be fast, reliable, and entirely secure. We built this specific tool within our Health category to solve real-world problems without compromising your privacy. Enjoy lightning-fast processing directly in your browser!
The One Rep Max is a free online utility that allows you to easily calculate one rep max from reps and weight. It is part of our Health suite and requires no downloads or installations.
Yes! Like all utilities on ToolVerce, the One Rep Max is 100% free. Because it runs locally in your web browser using client-side technology, your data is never uploaded to any external servers, ensuring complete privacy.
We use industry-standard algorithms and exact formulas to ensure the One Rep Max provides highly accurate results. However, please note that for critical health or financial decisions, you should always consult with a certified professional.
Read what our community thinks about ToolVerce.
"This tool saved me hours of manual work! Incredibly fast and easy to use."
Alex Chen
Sep 1, 2026
"Exactly what I was looking for. The interface is beautiful and there are no annoying ads."
Sarah Jenkins
Sep 2, 2026
"Really great utility. I use it almost every day for my development workflow."
Michael R.
Sep 3, 2026
"The fact that everything runs locally in the browser is amazing for privacy. Highly recommended!"
Elena V.
Sep 4, 2026
"Flawless execution. Does exactly what it promises without any unnecessary bloat."
David Kim
Sep 5, 2026
"This tool saved me hours of manual work! Incredibly fast and easy to use."
Alex Chen
Sep 1, 2026
"Exactly what I was looking for. The interface is beautiful and there are no annoying ads."
Sarah Jenkins
Sep 2, 2026
"Really great utility. I use it almost every day for my development workflow."
Michael R.
Sep 3, 2026
"The fact that everything runs locally in the browser is amazing for privacy. Highly recommended!"
Elena V.
Sep 4, 2026
"Flawless execution. Does exactly what it promises without any unnecessary bloat."
David Kim
Sep 5, 2026
Estimate your maximum single-rep strength and working rep percentages.
Best accuracy with 1-10 reps.
Estimated One Rep Max
Based on lifting 100 kg for 5 reps at RPE 10.
Brzycki Formula
113 kg
Lander Formula
114 kg
5-Formula Avg
116 kg
Rest 90-180s between heavy attempts.
| % of 1RM | Estimated Max Reps | Working Weight | Primary Adaptation |
|---|---|---|---|
| 100% | 1 rep | 117 kg | Max Effort (1RM) |
| 95% | 2 reps | 111 kg | Peak Strength |
| 90% | 3 reps | 105 kg | Heavy Strength |
| 85% | 5 reps | 99 kg | Strength & Hypertrophy |
| 80% | 8 reps | 94 kg | Hypertrophy Standard |
| 75% | 10 reps | 88 kg | Muscle Growth |
| 70% | 12 reps | 82 kg | Endurance & Volume |
| 65% | 15 reps | 76 kg | Muscular Endurance |
| 60% | 20 reps | 70 kg | Conditioning & Stamina |
| 50% | 25 reps | 59 kg | Warm-Up & Deload |