Health & Fitness Tools
Evidence-based health and fitness calculators to help you make informed decisions about nutrition, exercise, and wellness. Calculate your Total Daily Energy Expenditure (TDEE), plan your macronutrient intake, estimate body fat percentage, find your optimal calorie deficit, calculate heart rate training zones, plan intermittent fasting windows, and optimize your sleep schedule. All calculations use established formulas from sports science and clinical nutrition research — and your health data stays on your device.
10 free tools — all running privately in your browser
TDEE Calculator
Calculate Total Daily Energy Expenditure based on your activity level
Macro Calculator
Calculate daily protein, carbs, and fat targets for your goals
Calorie Deficit Calculator
Plan your calorie deficit to reach your target weight safely
Body Fat Calculator
Estimate body fat percentage using the US Navy method
One Rep Max Calculator
Estimate your 1RM using multiple proven strength formulas
Water Intake Calculator
Calculate recommended daily water intake based on weight and activity
Due Date Calculator
Calculate pregnancy due date and track gestational milestones
Heart Rate Zone Calculator
Find your training heart rate zones using the Karvonen method
Intermittent Fasting Calculator
Plan your fasting and eating windows with popular IF protocols
Sleep Cycle Calculator
Calculate the best times to sleep and wake up based on sleep cycles