All BMI and body calculators
16 free calculators for BMI, healthy weight, body shape and calories — private and quick.
Every calculator on 123BMICalculator, grouped by what you want to know. For your body mass index and healthy weight range, start with the BMI calculator. The others answer more particular questions — a child's BMI percentile, Asian cut-offs, how much weight to gain in pregnancy, your body fat, your waist-to-height ratio, or how many calories you need.
BMI calculators
- BMI CalculatorBody mass index, its category and your healthy weight range.
- BMI Calculator for WomenBMI with a body-fat estimate and waist check for women.
- BMI Calculator for MenBMI with a body-fat estimate and waist check for men.
- BMI Calculator for Kids & TeensBMI-for-age percentile for ages 2 to 19 (CDC growth charts).
- Asian BMI CalculatorBMI by Asian cut-offs: WHO 2004, NICE, China, Japan, India, Korea.
- BMI Calculator for SeniorsBMI after 65, with the low-BMI line for your age and a weight-loss check.
Healthy weight
- Healthy Weight CalculatorThe healthy weight range for any height, in lb or kg.
- Ideal Weight CalculatorIdeal body weight by Devine, Robinson, Miller and Hamwi.
- Goal Weight CalculatorYour goal weight, goal BMI and the date you could reach it.
- Pregnancy Weight Gain CalculatorRecommended pregnancy weight gain by week, from the IOM guidelines.
Body shape & fat
- Body Fat CalculatorBody fat % from a tape measure: US Navy method, RFM and BMI.
- Waist-to-Height Ratio CalculatorWaist ÷ height: keep it under 0.5 (NICE).
- Waist-to-Hip Ratio CalculatorWaist ÷ hips, with the WHO risk line: 0.90 men, 0.85 women.
- Body Roundness Index CalculatorBRI from height and waist, with the 2024 risk bands.
Calories
- BMR CalculatorCalories burned at rest: Mifflin–St Jeor, Harris–Benedict, Katch–McArdle.
- Calorie CalculatorDaily calories to maintain, lose or gain weight.
Which calculator should I use?
| If you want to know… | Use |
|---|---|
| Your BMI and what it means | BMI Calculator |
| A child's or teen's BMI (ages 2–19) | BMI Calculator for Kids & Teens |
| Your BMI by Asian, Chinese, Japanese, Indian or Korean cut-offs | Asian BMI Calculator |
| What a healthy BMI is after 65 | BMI Calculator for Seniors |
| What you should weigh for your height | Healthy Weight Calculator |
| When you could reach a goal weight | Goal Weight Calculator |
| How much weight to gain in pregnancy | Pregnancy Weight Gain Calculator |
| Your body fat percentage | Body Fat Calculator |
| Whether you carry too much weight around the middle | Waist-to-Height Ratio or Waist-to-Hip Ratio |
| How many calories you need a day | Calorie Calculator or BMR Calculator |
| Every height and weight at a glance | BMI Chart |