One Rep Max Calculator

Your one rep max is the maximum weight you can lift for a single repetition with proper form. It's used to set training percentages and track strength progress.

The Epley and Brzycki formulas are considered most accurate for reps under 10. For higher rep ranges (10+), the Wathan and Mayhew formulas tend to be more reliable. This calculator shows all seven for comparison.

Common training zones: 90-100% for maximal strength (1-3 reps), 75-85% for strength/hypertrophy (4-8 reps), 65-75% for hypertrophy (8-12 reps), and 50-65% for endurance (12+ reps).

Using the One Rep Max Calculator is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. No downloads, installations, or sign-ups are required. The tool runs directly in your web browser for maximum convenience.

Yes, the One Rep Max Calculator is 100% free to use with no limitations. There is no registration required, no daily usage caps, and no hidden fees. You can use it as many times as you need.

The One Rep Max Calculator uses industry-standard formulas and algorithms to deliver reliable results. While the tool is designed for accuracy, results should be used as estimates and guidance. For critical decisions, always consult a qualified professional.

Yes, the One Rep Max Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.