Fitness & Health Calculators
Explore our library of over 37 free, evidence-based health calculators. Whether you want to check your BMI, track your macros, or plan a pregnancy, our tools use established scientific formulas to give you highly accurate results. It is 100% private: no sign-ups required, and your data never leaves your screen. Browse the tools below or use the search bar to find exactly what you need.
- 100% Private
- Evidence-Based
- Always Free
Fitness
BMI Calculator
Calculate your Body Mass Index and find your ideal weight range.
Body Fat Calculator
Estimate your body fat percentage using common formulas.
BMR Calculator
Calculate your Basal Metabolic Rate — calories burned at rest.
Pace Calculator
Calculate running pace, time, or distance for your workouts.
Ideal Weight Calculator
Find your healthy weight based on height and gender.
Calories Burned
Estimate calories burned during different exercises and activities.
One Rep Max Calculator
Estimate the maximum weight you can lift for one repetition.
Pregnancy
Pregnancy Calculator
Calculate your current week, trimester, and estimated due date.
Pregnancy Weight Gain
Track healthy pregnancy weight gain by trimester.
Due Date Calculator
Estimate your baby's due date using LMP or conception date.
Ovulation Calculator
Predict your ovulation and most fertile days.
Conception Calculator
Estimate your conception date based on your due date or LMP.
Period Calculator
Track your menstrual cycle and predict upcoming periods.
Nutrition & Diet
Macro Calculator
Balance your daily carbs, protein, and fats for your goals.
Calorie Deficit Calculator
Find your exact calorie deficit target for weight loss.
Keto Calculator
Calculate exact macro ratios for a ketogenic diet.
Intermittent Fasting
Plan your eating windows and fasting schedules.
Carbohydrate Calculator
Determine ideal carb intake for weight control or performance.
Protein Intake Calculator
Get personalized protein intake targets per day.
Fat Intake Calculator
Find how much healthy fat you should consume daily.
TDEE Calculator
Find your Total Daily Energy Expenditure for maintaining or losing weight.
Calorie Calculator
Determine your daily calorie needs to maintain or lose weight.
Health & Recovery
More Tools
Water Intake Calculator
Determine your ideal daily hydration based on weight and activity.
Heart Rate Zones
Identify your cardio training and fat-burning heart rate zones.
VO₂ Max Calculator
Estimate your aerobic fitness level using VO₂ max formulas.
Metabolic Age Calculator
Compare your metabolism to your biological age.
Sleep Quality Index
Assess how well you’re resting and recovering using the PSQI method.
Fiber Intake Calculator
Find your personalized daily fiber target.
Glycemic Load Calculator
Compute GL per food or total daily load.
Max Heart Rate
Find your maximum safe heart rate during exercise.
VO₂ Reserve Calculator
Calculate your VO₂ reserve for endurance training intensity.
Waist-to-Hip Ratio
Assess your health risk by waist-to-hip ratio measurement.
Lean Body Mass
Calculate your lean muscle mass and fat-free weight.
Walking Calories
Convert your daily steps to exact calories burned.