Before you can improve your health, you need to measure it. These calculators translate physical attributes into standardised metrics that doctors, trainers, and nutritionists use every day - all based on clinically validated formulae and WHO reference classifications.

Fifteen Body Calculators

BMI Calculator: Body Mass Index - Full WHO classification across all 8 BMI categories (Severe Thinness through Obese Class III). Shows BMI Prime, Ponderal Index, Asia-Pacific category, healthy weight range, and distance from healthy range. Target Weight mode generates a weight-range table for every BMI category at your height.

BMI Calculator - Body Mass Index (weight in kg / height in m2). WHO classifies adults as: underweight (below 18.5), normal (18.5 to 24.9), overweight (25 to 29.9), and obese (30 and above). Supports metric and imperial inputs. Also shows the Asia-Pacific classification with lower thresholds (overweight at 23.0) relevant for Indian users.

BMR Calculator - Basal Metabolic Rate: calories your body burns at complete rest. Uses the Mifflin–St Jeor equation (most accurate for general use per the American Dietetic Association). Multiply BMR by your activity factor to get TDEE - feed that into the Calorie Deficit Calculator to set a safe fat-loss target.

Body Fat Calculator - Estimates body fat percentage using the US Navy circumference method (neck, waist, and hips). Accuracy ±3–4% vs. DEXA. Shows ACE body fat category: essential, athletic, fit, average, or obese.

Ideal Weight Calculator - Returns a healthy weight range for your height using four clinical formulas (Devine, Hamwi, Robinson, Miller) - showing the spread rather than a single arbitrary number.

BMI Calculator for Kids - Child BMI with CDC percentile classification for ages 2 to 19. Two modes: BMI Percentile (shows category and exact 5th/85th/95th percentile cutoffs for the child’s age and sex) and Healthy Weight Range (computes the weight range between the 5th and 85th percentile for a given height, age, and sex). Uses CDC 2000 Growth Chart reference data.

BMI Calculator for Men - BMI with male-specific extras. Two modes: BMI and Body Fat (standard BMI, WHO category, estimated body fat percentage via Deurenberg formula, ACE body fat category, and healthy weight range) and Weight Ranges (full table of kg and lbs targets for all BMI categories at a given height). Sliders for height and weight.

BMI Calculator for Women - BMI with female-specific body fat estimation. Two modes: BMI and Body Fat (standard BMI, WHO category, estimated body fat percentage via Deurenberg formula for women, ACE body fat category, and healthy weight range) and Weight Ranges (full table of kg and lbs targets for all BMI categories at a given height). Metric and imperial units with sliders.

Weight Loss Percentage Calculator - Calculates what percentage of starting body weight has been lost. Shows weight lost in lbs or kg and a clinical health context (NHLBI 5% and 10% thresholds). Target Weight mode: enter a goal percentage and get the target weight and estimated weeks needed at a safe 0.5 to 1 percent per week pace. Supports lbs and kg.

Waist to Hip Ratio Calculator - Calculates WHR from waist and hip measurements and classifies health risk using WHO thresholds (Low, Moderate, High) separately for males and females. Shows body shape classification (Apple, Hourglass, Pear) and ideal waist range for the measured hip size. Ideal Waist Finder mode gives a target waist range for any hip circumference.

Waist to Height Ratio Calculator - Calculates WHtR (waist divided by height) and classifies health risk using Ashwell thresholds: Extremely Slim (below 0.40), Healthy (0.40 to 0.49), Overweight (0.50 to 0.59), and Obese (0.60 and above). Shows target waist as half the height. Ideal Waist Finder mode gives the healthy waist range for any height. Supports cm and inch inputs.

BMI Calculator for Teens - Teen BMI using CDC BMI-for-age percentile charts (2000 Growth Charts, NHANES reference data) for ages 10 to 19. Classifies results as underweight (below 5th percentile), healthy weight (5th to below 85th percentile), overweight (85th to below 95th percentile), or obese (at or above 95th percentile) separately for males and females. Shows healthy weight range for the teen’s height, age, and sex. Supports metric and imperial inputs.

BMI Weight Loss Calculator - Calculates how much weight you need to lose (or gain) to reach a target BMI. Enter height, current weight, and target BMI to see the exact weight difference, target weight, and a realistic timeline estimate (0.5 to 1 kg per week). Healthy Weight Range mode shows the exact weight bracket for normal BMI (18.5 to 24.9) at any height without entering current weight. Metric and imperial units.

Geriatric BMI Calculator Enter height, current weight, and target BMI to see the exact weight difference, target weight, and a realistic timeline estimate (0.5 to 1 kg per week). Healthy Weight Range mode shows the exact weight bracket for normal BMI (18.5 to 24.9) at any height without entering current weight. Metric and imperial units.

How These Fifteen Calculators Work Together

Start with the BMI Calculator for a quick screen. Add the Body Fat Calculator for a more complete picture - a muscular athlete may have “overweight” BMI but healthy body fat. Use the BMR Calculator to find your calorie baseline, then check the Ideal Weight Calculator to understand what a healthy weight range looks like for your height. For children and teenagers aged 2 to 19, use the age- and sex-specific BMI Calculator for Kids or BMI Calculator for Teens instead of adult BMI cutoffs.

Frequently Asked Questions

What is a healthy BMI range for Indians?

The WHO standard normal range is 18.5–24.9. However, research shows South Asians carry higher metabolic risk at lower BMI values. The BMI Calculator shows both the WHO classification and the Asia-Pacific classification (overweight at 23.0, obese at 27.5).

Which BMR formula is most accurate?

The Mifflin–St Jeor equation shows the smallest mean error in multiple studies, especially for overweight individuals. The BMR Calculator uses Mifflin–St Jeor by default and also shows the Harris-Benedict result for comparison.

How do I measure correctly for the body fat calculator?

Waist: at the narrowest point, ~1 inch above the navel. Neck: just below the larynx, perpendicular to the neck axis. Hips (women only): at the widest point. Take three readings and average them. See measurement guidance on the Body Fat Calculator page.

Is ideal weight the same as target weight for fitness goals?

Not necessarily. The Ideal Weight Calculator gives population-based norms - your personal optimal weight depends on muscle mass, bone density, and athletic goals. Use it as a reference, not a rigid prescription.