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BMI Calculator

Use this BMI calculator to review an educational health calculation for BMI. The page returns BMI plus supporting values for adult BMI category, healthy weight range for this height, and screening note; check.

Primary answer
BMI
Inputs to verify
Age, Height, and Height unit
Use type
Use as an estimate that depends on assumptions.
Keyword intent
BMI calculator

Calculator

BMI Calculator

Calculates bmi from age, height, height unit. Defaults are filled in so you can review a working example before changing inputs.

years

Adult BMI categories are for adults 20 years and older.

Use centimeters when height unit is cm, or total inches when height unit is in.

Choose centimeters or inches.

Use kilograms when weight unit is kg, or pounds when weight unit is lb.

Choose kilograms or pounds.

Result

Result reflects the current submitted inputs.

  • Risk B
  • Reviewed 2026-05-26
  • 4 sources
BMI24.2 kg/m2
Adult BMI categoryHealthy Weight
Healthy weight range for this height53.5 kg to less than 72.3 kg
Screening noteFor adults 20 and older only; BMI is a screening measure and is not a substitute for professional medical advice.

Breakdown

Height used
1.7 m
Weight used
70 kg
  • This calculator uses adult BMI categories for people 20 years and older.
  • BMI is a screening measure and should be considered with other health information.
  • This calculator is not a substitute for professional medical advice.
  • Category thresholds use unrounded BMI; display BMI is rounded to one decimal.

Accuracy notes

Risk level
B
Reviewed
2026-05-26
Sources
4
Primary result
BMI

Formula logic is kept in a pure calculator module with fixtures, source notes, and page-visible assumptions.

Categories

What the result means

BMI is the number to carry forward from this BMI calculation. Body mass index rounded to one decimal for display. Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Use adult BMI category, healthy weight range for this height, and screening note to explain why BMI moved when an input changed. Record the inputs you used and verify any health concern with a qualified professional.

BMIBody mass index rounded to one decimal for display.
Adult BMI categoryAdult category based on unrounded BMI.
Healthy weight range for this heightWeight range from BMI 18.5 to less than 25, shown in the entered weight unit.
Screening noteVisible adult-use limitation and medical disclaimer.

Use the result this way

  1. Start with BMI, then use supporting outputs only to explain the primary answer.
  2. Verify age, height, and height unit before copying the result.
  3. Choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges.
  4. Record the inputs you used and verify any health concern with a qualified professional.

User job

How to use this calculator

Use BMI Calculator when you need bmi, then use adult bmi category and healthy weight range for this height to check the context for general wellness education and preparing for a professional conversation.

Best for

  • Understanding a formula-based estimate
  • Seeing which inputs drive a health-related output
  • Reviewing a default example before entering your own age and height.

Check before relying

  • Health formulas can be population-specific; do not use the result as diagnosis or treatment advice.
  • This calculator uses adult BMI categories for people 20 years and older.
  • BMI is a screening measure and should be considered with other health information.
  • Source context: Centers for Disease Control and Prevention, reviewed 2026-05-26.

Next useful step

Formula

BMI equals weight in kilograms divided by height in meters squared. Imperial inputs are converted to metric first. Key assumptions: This calculator uses adult BMI categories for people 20 years and older. BMI is a screening measure and should be considered with other health information. This calculator is not a substitute for professional medical advice.

  • BMI equals weight in kilograms divided by height in meters squared. Imperial inputs are converted to metric first.
  • This calculator uses adult BMI categories for people 20 years and older.
  • BMI is a screening measure and should be considered with other health information.
  • Primary source context: Centers for Disease Control and Prevention.

Inputs

Enter age, height, height unit, and weight for general wellness education and preparation for a professional conversation. Before calculating, choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges. Age: Adult BMI categories are for adults 20 years and older. Height: Use centimeters when height unit is cm, or total inches when height unit is in. Height unit: Choose centimeters or inches. Weight: Use kilograms when weight unit is kg, or pounds when weight unit is lb.

AgeAdult BMI categories are for adults 20 years and older.
HeightUse centimeters when height unit is cm, or total inches when height unit is in.
Height unitChoose centimeters or inches.
WeightUse kilograms when weight unit is kg, or pounds when weight unit is lb.
Weight unitChoose kilograms or pounds.

Example

Using the default inputs, BMI Calculator returns BMI of 24.2 kg/m2. Adjust age, height, height unit, and weight to match your own scenario.

FAQ

How is BMI calculated here?

BMI equals weight in kilograms divided by height in meters squared. Imperial inputs are converted to metric first. The first assumption to check is: This calculator uses adult BMI categories for people 20 years and older.

What does BMI mean for BMI?

Treat the result as educational context, then read the limitations and assumptions before discussing it with a professional. Secondary values such as adult BMI category, healthy weight range for this height, and screening note are there to explain the primary answer, not to replace it.

What should I enter for Age?

Adult BMI categories are for adults 20 years and older. Use years for this field. Choose the mode or method first because it can change which formula is applied, keep units consistent with the labels shown in the form, and stay within the documented minimum and maximum ranges.

How does Height change BMI?

Use centimeters when height unit is cm, or total inches when height unit is in. Changing it can alter BMI because the formula uses the submitted inputs together. Also compare measurement method, formula population, age range, units, sex or activity assumptions, and clinical context.

Why does the BMI example show 24.2 kg/m2 for BMI?

The default inputs produce 24.2 kg/m2 for BMI. Treat that as a format and scale check, then replace every default value with your own inputs.

Can the BMI result diagnose or prescribe anything?

No. Use it as educational context only. Health formulas can depend on population, measurement method, age range, and clinical context.

Sources

Last reviewed: 2026-05-26

  • Reviewed 2026-05-26 · Source 2024-06-18
    Calculating BMICenters for Disease Control and Prevention. Metric formula weight kg / height m squared; customary formula weight lb / height in squared x 703; adult-use limitation.
    Scope
    BMI formulas for metric and U.S. customary inputs; notes that adults 20 and older should use the adult BMI calculator.
    Supports
    Metric formula weight kg / height m squared; customary formula weight lb / height in squared x 703; adult-use limitation.
  • Reviewed 2026-05-26 · Source 2024-03-19
    Adult BMI CategoriesCenters for Disease Control and Prevention. Underweight, healthy weight, overweight, and obesity class thresholds; visible screening limitation.
    Scope
    Adult BMI categories for people 20 and older and BMI as a screening measure.
    Supports
    Underweight, healthy weight, overweight, and obesity class thresholds; visible screening limitation.
  • Reviewed 2026-05-26 · Source 2024-06-25
    Adult BMI CalculatorCenters for Disease Control and Prevention. Validation ranges for height and weight, adults 20 and older, and not-medical-advice disclaimer.
    Scope
    CDC adult BMI calculator input ranges and medical disclaimer.
    Supports
    Validation ranges for height and weight, adults 20 and older, and not-medical-advice disclaimer.
  • Reviewed 2026-05-26 · Source 2026-01-26
    Obesity and overweightWorld Health Organization. Secondary authoritative confirmation that BMI is weight kg divided by height m squared and adult overweight starts at 25 while obesity starts at 30.
    Scope
    Global BMI definition and adult overweight/obesity thresholds.
    Supports
    Secondary authoritative confirmation that BMI is weight kg divided by height m squared and adult overweight starts at 25 while obesity starts at 30.

Disclaimer

This health calculator is for educational body-metric estimates only. It does not diagnose, prescribe diet or treatment, or replace individualized advice from a qualified health professional.