Free Health Calculators
Free calculators for calorie needs, BMI, ideal weight, body fat, water intake, macros and waist-to-hip ratio, built on established scientific formulas.
Calorie Calculator
Find your daily calorie needs and targets to lose, maintain or gain weight.BMI Calculator
Find your body mass index, WHO category and healthy weight range for your height.Ideal Weight Calculator
See your ideal weight for your height with four clinical formulas and the healthy BMI range.Body Fat Calculator
Estimate your body fat percentage from tape measurements with the US Navy method.Water Intake Calculator
Find how much water to drink a day based on your weight, exercise and climate.Macro Calculator
Turn your daily calories and goal into grams of protein, carbs and fat.Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and the related health risk.
Why these tools?
Every calculator uses formulas that are widely accepted in clinical and scientific literature, and explains how to read the result, where the formula falls short and when to talk to a professional. Calculations run instantly in your browser; the values you enter are not stored or sent anywhere.
How to use the results
Calculators give a good starting estimate, but every body is different. The most accurate picture comes from change over time, not from a single measurement. When you track your weight, meals and body measurements regularly, you can adjust your targets based on your own data. Kilotaki lets you do that for free, without ads.
These tools are for information only and are not a substitute for medical advice, diagnosis or treatment. Talk to a doctor or registered dietitian before making health decisions.