Health Calculators
Free health and fitness calculators. BMI, calorie needs, body fat, pregnancy dates, BAC, heart rate zones, and more. Results are estimates — always consult a healthcare professional for medical decisions.
BMI Calculator
Calculate your Body Mass Index using NHS weight categories. Metric and imperial units.
Calorie Calculator
Find your daily calorie needs based on age, height, weight, sex, and activity level.
Macro Calculator
Calculate your ideal protein, carbohydrate, and fat split for your goal.
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method.
Pregnancy Due Date Calculator
Calculate your estimated due date and key pregnancy milestones from your LMP.
Ovulation Calculator
Find your fertile window and most likely ovulation date from your cycle length.
BAC Calculator
Estimate blood alcohol content from drinks, weight, sex, and time elapsed.
Heart Rate Zone Calculator
Find your maximum heart rate and target training zones by age and goal.
Water Intake Calculator
Calculate your recommended daily water intake based on weight and activity.
Ideal Weight Calculator
Estimate your ideal weight range using four clinical formulas.
Calorie Deficit Calculator
Work out the daily deficit needed to reach your target weight by a specific date.
Pregnancy Weight Gain Calculator
See recommended total and weekly weight gain based on pre-pregnancy BMI.