Quick BMI Calculation
Get a BMI estimate from weight in kilograms and height in centimetres.
✦ FREE ONLINE TOOL
Free BMI Calculator Online
Calculate your Body Mass Index using your height and weight. Check your adult BMI category, estimated healthy weight range and practical health guidance.
⚡ Fast & Free✓ Quick BMI Estimate▣ Mobile Ready♙ No Signup
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Calculate Your BMI
Enter your height and weight to get your BMI result.
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cm
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Personalize your health tips (optional)
Age helps us show the right BMI guidance. Adult BMI categories are for ages 20 and over.
Enter your weight and height to calculate your BMI.
✪Your BMI Result
BMI —Enter your details
< 18.5Underweight
18.5–24.9Healthy
25.0–29.9Overweight
≥ 30.0Obesity
▣Your Weight— kg
↕Your Height— cm
◉Your BMI—
BMI is a general screening measure, not a medical diagnosis.
MORE WAYS TO UNDERSTAND YOUR RESULT
BMI Toolkit
Choose the tool that matches what you came here to calculate. Your main BMI result stays at the top.
BMI TOOL
BMI Prime
BMI and related measurements are screening tools, not diagnoses. Results should be considered with your overall health and, when needed, advice from a qualified healthcare professional.
BMI Weight Categories
See the standard adult BMI ranges and where your result falls.
Healthy Weight Range
View an estimated adult weight range based on your entered height.
Practical Health Guide
Explore general, sustainable habits and helpful next steps.
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YOUR NEXT STEP
Your Personal Health Guide
Practical, evidence-informed tips based on your BMI result.
YOUR RESULT—
Calculate your BMI to see guidance.
ESTIMATED HEALTHY WEIGHT RANGE—Based on adult BMI 18.5–24.9
Food & Nutrition
Movement & Exercise
Sleep & Daily Habits
A Helpful Next Step
BMI is a screening measure, not a diagnosis. Your health cannot be assessed from BMI alone. If you are pregnant, have a chronic condition, have experienced unexplained weight change, or are concerned about your result, seek advice from a qualified healthcare professional.
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BMI Health GuideKnow what your BMI means.
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18.5–24.9Healthy weight range
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Eat HealthyChoose a balanced diet.
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Stay ActiveDo regular exercise.
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Stay HydratedDrink enough water daily.
What Is Body Mass Index (BMI)?
Body Mass Index (BMI) is a screening measure that compares a person's weight with their height. It can help adults understand a general weight category, but it does not directly measure body fat, muscle mass, fat distribution or overall health.
BMI Formula
BMI = Weight (kg) ÷ [Height (m) × Height (m)]
Example: If you weigh 70 kg and are 175 cm tall, the calculation is 70 ÷ (1.75 × 1.75) = 22.9 (approximately).
Adult BMI Chart
| Adult BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5–24.9 | Healthy weight range |
| 25.0–29.9 | Overweight |
| 30.0 or above | Obesity range |
These are general screening categories for adults aged 20 and over. BMI for children and teens needs age- and sex-specific interpretation. BMI is not a diagnosis.
Estimated Healthy Weight Range
For adults, the commonly used BMI range of 18.5–24.9 can be used to estimate a weight range for a given height. This is a general reference, not a personal target or a substitute for clinical assessment. Your calculator result displays this estimate after you enter your measurements.
How to Use This BMI Calculator
- Enter your current weight in kilograms (kg).
- Enter your height in centimetres (cm).
- Optionally add your age to receive the relevant guidance. Adult categories are used only from age 20.
- Select an optional daily activity level to tailor the general movement tips.
- Select Calculate BMI to view your result, adult category guidance and estimated healthy weight range.
For a more consistent estimate, measure your height without shoes and use a recent weight measurement.
What Are the Limitations of BMI?
BMI is useful as a quick screening measure, but it has important limitations:
- It does not directly measure body fat or muscle mass.
- It does not show where body fat is stored.
- It may not reflect differences in age, pregnancy, muscle build or individual health conditions.
- It should not be used to classify children and teenagers with adult BMI categories.
Consider BMI alongside other information such as waist measurement, blood pressure, medical history and advice from a qualified healthcare professional. If you are concerned about your weight or health, seek individual guidance.
Explore More Free Tools
Keep exploring with these handy tools from InfoJano.
BMI Calculator FAQs
What is a good BMI?
For most adults, a BMI from 18.5 to 24.9 is commonly described as the healthy-weight range. BMI is only a screening measure and should be considered with other health information.
How do I calculate my BMI?
Divide your weight in kilograms by your height in metres multiplied by itself. This calculator performs the calculation after you enter your weight and height.
What is my ideal weight for my height?
There is no single ideal weight for everyone. This calculator shows an estimated adult weight range based on the standard BMI range of 18.5–24.9, but personal health factors also matter.
Is BMI the same for men and women?
The standard adult BMI categories are generally the same for adult men and women. However, BMI does not capture every difference in body composition or individual health.
Does BMI measure body fat?
No. BMI uses height and weight and does not directly measure body fat, muscle mass or fat distribution.
Can children and teenagers use this BMI calculator?
This page does not calculate child or teen BMI percentiles. For people aged 2–19, BMI needs age- and sex-specific interpretation. Do not use adult BMI categories to classify children or teenagers.
How often should I check my BMI?
There is no single schedule that suits everyone. If you monitor BMI, focus on longer-term trends rather than day-to-day changes, and discuss concerns with a healthcare professional.
Is this BMI calculator free?
Yes. The InfoJano BMI Calculator is free to use. Enter weight in kilograms and height in centimetres to get a general BMI estimate.