Units
kg
reps
Medical Disclaimer
This tool is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for interpretation of your results.
Strength is built in recovery
How you adapt between sessions is set by testosterone, cortisol and key recovery markers. Test them, with AI-powered analysis and recommendations built around your results.
Key Points
- Estimates the maximum weight you could lift for a single repetition based on a submaximal set
- Both formulas are most accurate in the 2-10 rep range. Predictions become less reliable above 10 reps
- Epley formula: weight × (1 + reps ÷ 30). Brzycki formula: weight × 36 ÷ (37 − reps)
- The average of both formulas is provided as a balanced estimate. Neither formula is universally more accurate
- Never attempt a true 1RM without a spotter and proper warm-up. Estimated values are safer for programming
Quick Facts
- Category
- Strength
Related Converters
Medical Disclaimer
This tool is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for interpretation of your results.
Test what drives your training
A blood panel covering the hormonal and recovery markers behind strength gains, analysed and explained.