Health & Fitness

12 tools — all free, all in-browser.

BMI CalculatorCalculate your Body Mass Index using metric or imperial units with category breakdown.Use Tool →Sleep CalculatorFind the best bedtime or wake-up time based on 90-minute sleep cycles. Wake up refreshed with this free sleep cycle calculator.Use Tool →TDEE CalculatorCalculate your Total Daily Energy Expenditure using the Mifflin-St Jeor formula. Find calorie targets for weight loss, maintenance, or muscle gain.Use Tool →Ideal Weight CalculatorCalculate your ideal body weight using four clinical formulas: Devine, Robinson, Miller, and Hamwi. Supports metric and imperial units.Use Tool →Heart Rate Zone CalculatorFind your 5 heart rate training zones based on age or max heart rate. Includes the Karvonen formula with fat burn, aerobic, and VO₂ max zones.Use Tool →Body Fat CalculatorEstimate body fat percentage using the US Navy circumference method. Enter height, neck, waist, and hip measurements to see your body fat category. Metric and imperial supported.Use Tool →Weight Loss CalculatorCalculate how long it will take to reach your weight loss goal. Choose your pace, see the required daily calorie deficit, and get a month-by-month weight milestone breakdown.Use Tool →Running Pace CalculatorConvert running pace and speed with race finish time estimates.Use Tool →Calorie Burn CalculatorEstimate calories burned using activity MET, body weight, and workout duration.Use Tool →Daily Water Intake CalculatorEstimate daily hydration target in ml and liters using weight, activity, and climate.Use Tool →Breathing Exercise TimerFollow guided breathing exercises to reduce stress, improve focus, or fall asleep. Choose Box Breathing, 4-7-8, Calm Breathing, or Energizing Breath with an animated visual guide.Use Tool →Macro CalculatorCalculate daily protein, carbohydrate, and fat targets based on your TDEE and goal. Enter your stats and choose to lose weight, maintain, or build muscle — get gram and calorie breakdowns.Use Tool →