TDEE calculator
Free TDEE calculator using the Mifflin-St Jeor equation. Estimate maintenance calories, fat loss, and muscle gain targets. For education only.
Open calculator →Free tools
Fitness calculators
Open calculators for calories, macros, protein, and strength estimates. Use them free, then log your targets in Refyuel Health OS.
Nutrition
Macro calculator
Free macro calculator: enter daily calories and protein target to split carbs and fat. For gym-goers tracking nutrition. Educational only.
Open calculator →Protein calculator
Calculate daily protein in grams from body weight and g per kg. Common ranges for fat loss, maintenance, and muscle gain. Educational only.
Open calculator →
Training
1RM calculator
Estimate your one-rep max (1RM) from weight and reps using the Epley formula. Same approach as Refyuel Health OS strength tracking. Educational only.
Open calculator →
Educational only - not medical advice. Health disclaimer
Join the Health OS beta
Get early access to workout tracking and nutrition logging on Android and iOS - free during the beta.