Health Calculators

Ovulation Calculator

Calculate your ovulation day and fertile window based on cycle length.

Blood Alcohol Content Calculator

Estimate your blood alcohol content (BAC) using the Widmark formula.

Dog Age Calculator

Convert your dog's age to human years based on size and age.

Love Calculator

Calculate fun compatibility score based on birth dates. For entertainment only.

BMI Calculator

Calculate your Body Mass Index and find your weight category.

BMR Calculator

Calculate your Basal Metabolic Rate — calories burned at rest.

Calorie Burn Calculator

Estimate calories burned during exercise by activity and weight.

Ideal Weight Calculator

Find your ideal body weight based on height and gender.

Water Intake Calculator

Calculate your daily water intake recommendation by weight.

TDEE Calculator

Calculate Total Daily Energy Expenditure from BMR and activity level.

Body Fat Calculator

Estimate body fat percentage using the US Navy circumference method.

Macro Calculator

Calculate daily protein, carbohydrate, and fat targets from TDEE.

Heart Rate Calculator

Find your max heart rate and training zones by age.

Waist Hip Ratio Calculator

Calculate your waist-to-hip ratio and assess health risk.

Lean Body Mass Calculator

Calculate your lean body mass from weight and body fat percentage.

Protein Intake Calculator

Calculate daily protein requirements based on weight and goals.

Calorie Deficit Calculator

Calculate calorie deficit needed to reach your weight loss goal.

Pregnancy Due Date Calculator

Estimate your pregnancy due date from the last menstrual period.

Running Pace Calculator

Calculate your running pace, speed, and finish time for any race.

Steps to Calories Calculator

Convert daily step count to estimated calories burned.

BMI Prime Calculator

Calculate BMI Prime — a ratio of BMI to the upper healthy limit.