YUTHI Calculator · Sport · Strength
1RM Calculator
Instead of risky maximal tests: do one clean set with the heaviest weight you can safely handle, and the calculator estimates your one-rep maximum. Plus a training table for every percentage range.
Continue in the app
That was the snapshot. The app turns it into daily support.
Measure every day instead of calculating once: Vito or Vita puts your numbers in context, builds you a weekly plan and speaks up when something stands out.
Soon on theApp Store
Soon onGoogle Play
Launching at the end of 2026 — iPhone first, Android to follow. Let me know when it’s out ↓
Your estimated 1RM (Epley)
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kg
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Training rules of thumb: hypertrophy (muscle growth) typically 70–85 % · maximal strength 85–95 % · strength endurance 50–70 %. Longevity tip: strength training 2× per week is enough to maintain.
The calculator provides an estimate. The higher the repetition count, the less accurate the value – at 10+ repetitions Epley often underestimates your true 1RM. Warm up well before every set.
Formula: Epley (1985): 1RM = weight × (1 + reps ÷ 30). · Source: Epley B. Poundage Chart. Boyd Epley Workout. Lincoln, NE: Body Enterprises; 1985. Reference values by Brzycki, Lombardi are similarly precise.