Calculators
One-rep max (1RM)
Estimate your one-rep max from a single set (Epley and Brzycki formulas), with the percentage table for your workouts.
Your estimated one-rep max–
An estimate, not medical advice. For personal guidance, talk to a health professional.
Other calculators
Support Ration
Ration is free, ad-free, and your data stays on your phone. If the app helps you, a small donation funds the next versions.
Donations open very soon. Meanwhile, you can share Ration or write to us.
Secure payment: Ration never sees your card.