Muscle and sport
High muscle mass can raise your BMI without any extra body fat behind it. Pair the result with % body fat or tape measurements.
BMI Calculator
Enter weight and height. With U.S. units, 154 lb and 67 in give a BMI of about 24.1. With metric units, 70 kg and 170 cm give about 24.2. This is mass divided by height squared, not body composition and not a diagnosis.
The calculator reports mass relative to height using WHO adult cut-offs. That is not a diagnosis, it does not distinguish muscle from fat, and it does not replace age- and sex-specific percentile charts for children. After strength training, use the Navy method. Daily calorie need is on the TDEE page.
Result
Enter weight and height. The result will appear here.
How results are calculated
Mass154 lb
Height67 in
BMI24.1
BMI in this calculator is mass in kilograms divided by height in meters squared. At 70 kg and 170 cm, height is 1.70 m, and 70 ÷ 1.70² is about 24.2. At 154 lb and 67 in the U.S. formula is 703 × 154 ÷ 67², about 24.1.
A second example, 92 kg and 180 cm, is about 28.4. With U.S. units the formula is 703 × weight in pounds ÷ height in inches squared. The healthy weight range in the result is the mass for BMI 18.5–24.9 at your height.
WHO adult cut-offs: below 18.5 underweight, 18.5–24.9 normal weight, 25–29.9 overweight, from 30 the obesity classes. This is a screening convention, not a health score and not a muscle measurement. The mass range for 18.5–24.9 is a map, not a medical target.
Enter weight and height in the units on the labels, then choose Calculate. The result is BMI, the category, and a mass range. A comma and a period in 70.5 both parse. The metric and U.S. switch changes labels and does not convert numbers you already entered. Do not mix kilograms with inches in one calculation.
Muscle is denser than fat, so an overweight label after strength training can mislead. Girth estimates are on the Navy method page. Daily calories are on TDEE. In pregnancy the adult cut-offs do not judge gain: that is a separate calculator from pre-pregnancy BMI.
48 kg and 170 cm give about 16.6. 52 kg and 162 cm is about 19.8, in the normal range. Children and teens use age- and sex-specific percentile charts. This calculator is for adults. The result does not replace sleep or labs your doctor ordered.
How to use
- Enter weight, for example 154 lb when the header uses U.S. units, or 70 kg for metric.
- Enter height, for example 67 in, or 170 cm. The metric formula converts 170 cm to 1.70 m.
- Click Calculate. 154 lb and 67 in give about 24.1. 70 kg and 170 cm give about 24.2.
- Compare with the 18.5–24.9 range and with 92 kg at 180 cm, about 28.4.
- If you strength-train, open the Navy method. Daily calories are on TDEE, not in this ratio.
BMI and the WHO range on this page
The calculator divides mass by height in meters squared. At 70 kg and 170 cm the result is about 24.2. At 92 kg and 180 cm it is about 28.4.
- BMI
- Body Mass Index, mass over height squared. Here 70 ÷ 1.70² ≈ 24.2. It is not body fat and not a diagnosis.
- WHO
- World Health Organization, the source of the 18.5–24.9 adult range. The calculator shows it as a screening convention, not a diagnosis.
BMI categories at a glance
Five WHO adult ranges — the same split you see in the silhouettes below. After you calculate, the matching silhouette is highlighted.
Weight is low for height. Diet and causes are worth reviewing with a clinician.
This is the range most people call healthy weight for adults.
Weight is high for height. This is a reasonable moment to review food and movement.
WHO classes I and II. Risk is higher here; a check-up is reasonable.
The highest screening range. Plan care together with a doctor.
WHO adult ranges
The table is the adult screening convention. The calculator uses the same cut-offs. This is not a diagnosis.
| BMI | Category |
|---|---|
| below 18.5 | underweight |
| 18.5–24.9 | normal weight |
| 25–29.9 | overweight |
| 30–34.9 | obesity class I |
| 35–39.9 | obesity class II |
| 40 and above | obesity class III |
At 154 lb and 67 in, about 24.1 is in the 18.5–24.9 range. At 70 kg and 170 cm the result is about 24.2. At 92 kg and 180 cm, about 28.4 is overweight under this convention.
How to read your BMI
BMI sorts adults by weight relative to height. It is a screening tool: it shows which WHO range you are in, not whether you are healthy or ill.
What this result does well
It gives researchers a shared language and gives you a quick map: underweight, normal, overweight, obesity. Across large groups it works reasonably well.
What this result does not do
It does not measure fat, see muscle, or know your age or whether you are pregnant. One number cannot replace labs or a conversation with a clinician.
Where the healthy weight range comes from
For your height the calculator computes the mass that matches BMI 18.5 and 24.9. That is the span shown as the healthy weight range.
It is orientation, not a personalized target. A muscular, older, or recovering person can be outside the range for good reasons, and the reverse can be true too.
BMI vs muscle, age, pregnancy, and kids
Age
In older adults, body composition and risk patterns differ from those of a 30-year-old. BMI is only one signal, not the whole story.
Pregnancy
Adult cut-offs are not a pregnancy assessment. What matters is the rate of weight gain. That is why there is a dedicated calculator for it.
Children and teens
They need age- and sex-specific percentiles instead. This calculator is for adults.
BMI vs other metrics
BMI answers only one question: weight relative to height. These three tools answer different questions, and they are often the better next step.
BMI vs body fat
What it measures: BMI is weight for height. Body-fat percentage is an estimate of fat share from tape measurements.
When it helps: after strength training, when BMI looks high while you feel fit, or when you want to know whether your weight is mostly muscle.
What it misses: BMI cannot tell fat from muscle. Body-fat estimates remain estimates, not a DXA scan.
Calculate body fat →BMI vs BMR
What it measures: BMR is a rough resting calorie need.
When it helps: when you are planning food, want an energy baseline, or comparing diet phases.
What it misses: BMR does not judge whether your BMI is good, and it ignores training load.
Calculate BMR →BMI vs TDEE
What it measures: TDEE is daily energy with activity, usually BMR times an activity factor.
When it helps: when you want to maintain, build, or reduce weight without guessing calories.
What it misses: TDEE does not score your BMI category and does not replace clinical care.
Calculate TDEE →Examples
Three sets of numbers, three categories. Example units follow the header: kilograms and centimeters, or pounds and inches.
Example 1
- Weight: 48 kg
- Height: 170 cm
BMI about 16.6 — underweight
When the result is below 18.5, the calculator also points to a body-fat estimate, protein, and TDEE, not only the category label.
Example 2
- Weight: 52 kg
- Height: 162 cm
BMI about 19.8 — normal weight
The result is inside the WHO range. Body fat, protein, and water are still useful next checks.
Example 3
- Weight: 92 kg
- Height: 180 cm
BMI about 28.4 — overweight
The label can mislead after strength training. Start with body fat, then BMR and TDEE.
Related health calculators
BMI is a solid start. These tools answer the next questions: body composition, daily needs, and the cases where adult BMI cut-offs do not fit.
Body composition
Daily needs
Pregnancy & exceptions
Frequently asked questions
What BMI do I get at 154 lb and 67 in?
About 24.1. The U.S. formula is 703 × 154 ÷ 67². With metric units, 70 kg and 170 cm give about 24.2. Both results are in the upper part of the 18.5–24.9 adult WHO range.
What range counts as a healthy weight?
For adults, the usual convention is 18.5–24.9. It is a screening range, not a health score. Below 18.5 is underweight, 25–29.9 is overweight, and from 30 the obesity classes begin.
Does BMI still help after strength training?
It often overstates the picture. Muscle is denser than fat, so a person with low body fat can still receive an overweight label. In that case, use the Navy method as well.
Will this calculator give me an ideal weight?
The result includes the mass range that matches BMI 18.5–24.9 at your height. That is a map, not a medical target and not a guarantee of body shape.
What is BMI at 128 lb and 63 in?
About 22.7, inside the usual adult range. The metric pair 58 kg and 160 cm is the same calculation. 48 kg and 170 cm give about 16.6, below 18.5.
Can I use this calculator for children and teens?
No. Children and teens need age- and sex-specific percentile charts. This calculator is for adults.
Do these cut-offs apply in pregnancy?
Adult cut-offs do not assess pregnancy. Weight gain is paced from pre-pregnancy BMI on the pregnancy weight-gain calculator.
What else is worth checking besides this number?
Girths and body-fat share on the Navy method, daily calories on TDEE, sleep, and laboratory tests your doctor ordered. BMI is a starting point, not the whole report.
Is 203 lb and 71 in overweight in this convention?
About 28.4, in the 25–29.9 range. The metric pair is 92 kg and 180 cm. After strength training that label can mislead: use the Navy method first, then TDEE.
Can I mix kilograms with inches?
Not in one calculation. Use both fields in kilograms and centimeters, or both in pounds and inches. The unit switch changes labels; it does not convert numbers you already entered.
Knowledge sources
The 18.5–24.9 ranges in this calculator are the WHO convention for adults, not a diagnosis.
- Wikipedia — body mass index
- WHO — obesity and overweight fact sheet
- MedlinePlus — body mass index
- CDC — body mass index
Page updated September 22, 2026.