One Rep Max Calculator
Calculate Your Maximum Strength Potential
Estimate your one-repetition maximum (1RM) using proven formulas. Perfect for strength training, powerlifting, and tracking your progress over time.
Calculate Your 1RM
Enter your lift weight and reps performed
Understanding One Rep Max
What is 1RM?
Your one-repetition maximum (1RM) is the maximum amount of weight you can lift for a single repetition with proper form. It's a key metric for measuring strength and designing training programs.
Why Calculate 1RM?
- • Set appropriate training loads
- • Track strength progress over time
- • Compare performance across exercises
- • Design periodized training programs
Safety Guidelines
- • Never attempt true 1RM without proper experience
- • Always use a qualified spotter
- • Warm up thoroughly before heavy lifting
- • Use calculated estimates for program design
- • Progress gradually to avoid injury
Best Practices
- • Test 1RM every 4-6 weeks maximum
- • Use 3-5 rep max for safer testing
- • Focus on form over weight
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