BMI, calories, pace, heart rate and other everyday health and fitness estimates. All tools are free and work directly in your browser.
Popular tools people often start with in this category.
Estimate body mass index from height and weight using the standard adult BMI formula.
Estimate daily calorie needs by multiplying estimated BMR by an activity factor.
Calculate average running pace and speed from distance and elapsed time.
Browse the complete set of tools in this category.
Estimate body mass index from height and weight using the standard adult BMI formula.
Estimate basal metabolic rate using the Mifflin–St Jeor equation.
Estimate adult body-fat percentage from body measurements using the U.S. Navy circumference method.
Estimate body surface area using the Mosteller formula.
Estimate daily calorie needs by multiplying estimated BMR by an activity factor.
Compare several common adult ideal-body-weight formulas based on sex and height.
Convert a daily calorie target and macro percentages into grams of protein, carbohydrates and fat.
Estimate one-repetition maximum (1RM) from a lifted weight and repetition count using common strength formulas.
Calculate average running pace and speed from distance and elapsed time.
Estimate exercise heart-rate zones from age using a simple percentage of estimated maximum heart rate.
Estimate total daily energy expenditure (TDEE) from age, sex, height, weight and activity level using the Mifflin–St Jeor BMR equation.
Calculate waist-to-height ratio using waist circumference and height in the same units.
Calculate walking pace and speed from distance and elapsed time.
Create a simple daily hydration planning estimate from body weight, a chosen ounces-per-pound factor and optional exercise fluid.
BMI, calories, pace, heart rate and other everyday health and fitness estimates. Use these tools for quick estimates, comparisons and everyday planning.
Explore focused calculator clusters with related tools, formulas, examples and long-tail guides.
BMI compares mass with height using kilograms divided by meters squared, but it does not directly measure body fat or fitness. Calorie calculators use formulas based on the inputs and activity assumptions you provide; real-world energy needs can differ. A pace calculator is more mechanical: divide time by distance to estimate minutes per mile or kilometer. Health-related results on this site are general educational estimates, not diagnoses or individualized medical advice.