Protein
105 g
Supports recovery and fullness.
Your Details
Fill in the fields below to calculate your BMI and health metrics.
Additional Health Insights
Use these numbers as a practical nutrition and hydration starting point.
Everyday planning
Carbs
269 g
Steady fuel for daily energy.
Fats
72 g
A practical range for hormones and satiety.
Water
2.5 - 3.0 L
Daily hydration recommendation.
Saved BMI Results
Keep a simple on-device history so you can compare new and old results later.
No saved results yet. Tap “Save Result” after a calculation to add one.
BMI Calculator With Age, Gender and Waist Size
This page is built for adults who want more than one number. Along with body mass index, you can review a healthy weight range, waist-to-height ratio, body fat estimate, daily calorie guidance, hydration, and a simple trend view.
Clear and practical
Fast body mass index check
Enter height and weight in metric or US units and see your BMI score instantly. The result updates with an easy-to-read adult category so you can understand the number without guessing.
Healthy weight calculator by height
The calculator also shows a healthy weight range for your height, making it easier to translate BMI into kilograms or pounds that feel more practical in daily life.
Extra context beyond BMI
Waist-to-height ratio, calorie needs, body fat estimate, and nutrition targets help add context when BMI alone does not tell the full story.
Body Mass Index Formula and Worked Examples
If you want to calculate BMI by hand, these are the standard formulas used on this page.
Formula transparency
Metric formula
BMI = weight (kg) ÷ height (m)2
Example: 70 kg and 175 cm = 22.9 BMI.
US formula
BMI = weight (lb) ÷ height (in)2 × 703
Example: 154 lb and 5 ft 9 in = 22.7 BMI.
Example 1: Normal BMI range
A person who is 175 cm tall and weighs 70 kg has a BMI of 22.9, which sits inside the standard healthy adult range.
Result: 22.9 · Normal
Example 2: Healthy weight by height
At 175 cm, the healthy weight range is based on BMI 18.5 to 24.9. This page converts that range into kilograms and pounds automatically.
Range: 56.7 kg to 76.3 kg
Example 3: Add waist size for more context
If waist size is available, waist-to-height ratio helps add a simple check on fat distribution, which can matter even when BMI looks normal.
Target: waist < half of height
Adult BMI Categories
These are the most widely used adult BMI ranges for general screening.
BMI chart for adults
| Category | BMI Range | What it usually means |
|---|---|---|
| Underweight | Below 18.5 | Weight is below the standard adult healthy range for height. |
| Normal or healthy weight | 18.5 to 24.9 | Falls inside the standard adult healthy BMI range. |
| Overweight | 25.0 to 29.9 | Above the healthy range and worth reviewing with waist size and lifestyle habits. |
| Obesity Class I | 30.0 to 34.9 | Higher weight-related risk for many adults. |
| Obesity Class II | 35.0 to 39.9 | More serious health risk and stronger reason to seek structured guidance. |
| Obesity Class III | 40.0 and above | Very high risk category for many adults. |
Healthy Weight Range by Height
Use this quick reference table to compare common adult heights with the standard healthy BMI range.
Quick lookup
| Height | Healthy Weight Range | In Pounds |
|---|---|---|
| 150 cm (4'11") | 41.6 kg to 56.0 kg | 91.7 lb to 123.5 lb |
| 155 cm (5'1") | 44.4 kg to 59.8 kg | 97.9 lb to 131.8 lb |
| 160 cm (5'3") | 47.4 kg to 63.7 kg | 104.5 lb to 140.4 lb |
| 165 cm (5'5") | 50.4 kg to 67.8 kg | 111.1 lb to 149.5 lb |
| 170 cm (5'7") | 53.5 kg to 72.0 kg | 117.9 lb to 158.7 lb |
| 175 cm (5'9") | 56.7 kg to 76.3 kg | 125.0 lb to 168.2 lb |
| 180 cm (5'11") | 59.9 kg to 80.7 kg | 132.1 lb to 177.9 lb |
| 185 cm (6'1") | 63.3 kg to 85.2 kg | 139.6 lb to 187.8 lb |
| 190 cm (6'3") | 66.8 kg to 89.9 kg | 147.3 lb to 198.2 lb |
| 195 cm (6'5") | 70.3 kg to 94.7 kg | 155.0 lb to 208.8 lb |
What BMI Can Tell You and What It Cannot
BMI is useful because it is quick, simple, and easy to compare. It becomes even more useful when it is paired with waist size, body fat estimates, activity level, and health history.
Use with context
What BMI helps with
- Fast screening: It quickly compares weight and height.
- Clear categories: It helps sort results into underweight, healthy, overweight, or obesity ranges.
- Healthy weight planning: It can estimate a healthy weight range for your height.
- Useful starting point: It is easy to track over time together with waist size and lifestyle habits.
What BMI misses
- Muscle vs fat: More muscular people can score higher without excess body fat.
- Fat distribution: BMI does not show where fat is carried, especially around the waist.
- Life stage: Older adults, athletes, and some body types may need more context.
- Not a diagnosis: BMI supports screening. It does not diagnose illness on its own.
Waist-to-Height Ratio and Body Fat Context
Two people can share the same BMI and still look very different. Waist size helps explain fat distribution, and body fat estimates add another layer when you want a more complete picture.
More than one signal
Waist-to-height ratio
This number is your waist measurement divided by your height. Many adults use a target below 0.50 as a simple lower-risk checkpoint.
Body fat estimate
This page uses a measurement-based method when enough values are available, or a practical BMI-based estimate when they are not. It is a guide, not a lab test.
Daily calories and macros
Energy needs are estimated from age, height, weight, sex, and activity level so your BMI result connects with an everyday eating plan.
BMI Calculator FAQ
These are the questions people often ask before or after using a body mass index calculator.
Helpful answers
What is a normal BMI for adults?
For most adults, a BMI from 18.5 to 24.9 is considered the standard healthy range. Results below that range are classed as underweight, while results from 25 upward move into overweight and obesity ranges.
How do I calculate BMI in kg and cm?
Convert height to meters first, then divide weight in kilograms by height in meters squared. For example, 70 kg ÷ 1.75² = 22.9 BMI.
Does age or gender change the adult BMI formula?
The adult formula stays the same, but age, sex, muscle mass, body fat distribution, and waist size change how much meaning that number carries. That is why this page also includes extra context.
Should children and teens use this adult BMI calculator?
No. Children and teens need age-specific growth chart interpretation, so the adult BMI ranges on this page are best for adults.
Is BMI enough on its own?
BMI is a strong starting point because it is simple and widely understood. Still, waist size, body fat, activity, food habits, sleep, blood pressure, and medical guidance often matter just as much.
Can I use this page as a healthy weight calculator by height?
Yes. The calculator converts the standard healthy BMI range into a healthy weight range for your specific height, in kilograms and pounds.
Remember: BMI is one useful signal, but your overall wellbeing also depends on body composition, movement, sleep, stress, and the habits you can keep consistently.
Stay healthy, stay strong!