PesaFit — Free fitness and nutrition calculators

BMI, daily calories (TDEE), macros, protein intake, 1RM, running pace, Hyrox times and more. Built with evidence-based formulas (Mifflin-St Jeor, ISSN protein ranges, Epley 1RM, OMS hydration). Runs entirely in your browser. No signup, no data sent to any server.

Pesafit started as a Spanish-only project; the English version is currently being built. The Spanish site is fully feature-complete and you can switch to it any time with the language toggle in the header.

Explore

• Calculators — TDEE, BMI, macros, protein, 1RM, pace, Hyrox, hydration, fasting, heart-rate zones, body composition.
• Guides — long-form articles on calorie deficit, macros, training, hydration. (Currently being translated.)
• About — who we are and how we source our data.