How do I calculate BMI using kilograms and centimetres?

Divide height in centimetres by 100 to get metres, then divide weight in kilograms by height in metres squared. For 65 kg and 170 cm: 65 ÷ (1.70 × 1.70) ≈ 22.5. Select “Centimetres & kilograms” to enter those measurements directly.

What is a healthy BMI for adults?

The standard adult healthy-weight band is 18.5 to below 25, labelled “Normal weight” here. Below 18.5 is underweight, 25 to below 30 is overweight, and 30 or above is obesity. A category alone does not establish whether someone is healthy.

Is BMI an accurate measure of health?

BMI can be useful for screening, but it is not a complete measure of health or a diagnosis. It does not directly measure body fat or distinguish fat from muscle. A qualified healthcare professional can interpret it alongside other measurements and your health history.

Can children use adult BMI categories?

The adult bands shown here are not suitable for children or teenagers. Their measurements are compared against age- and sex-specific growth charts, so a healthcare professional should interpret them.

What is the healthy weight range shown with my result?

It is the weight range that corresponds to a BMI of 18.5 to 24.9 at the height you entered. It is a reference range derived from the formula, not a personal target.

Why does the calculator show a message instead of a number sometimes?

If a box is empty, zero, negative, or outside a realistic range for an adult height or weight, the calculator asks you to check your entries rather than showing an impossible result.

Can I calculate BMI using feet and inches?

Yes. Select “Feet/inches & kilograms” or “Feet/inches & pounds”, then enter feet and inches in their separate height fields. Use the weight unit you selected. The calculator converts height and weight to metric before calculating BMI.

BMI Calculator

Work out your body mass index from your height and weight, in metric or imperial units.

Under 15 seconds

Updated 24 Oct 2026

Your BMI

22.5

Standard adult category: Normal weight.

Category: Normal weight
Healthy BMI weight range: 53.5 – 72 kg

Height used

170 cm

Weight used

65 kg

Units entered

centimetres and kilograms

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BMI is a screening measure and does not by itself determine an individual's overall health. Results should not be treated as a medical diagnosis.

BMI (body mass index) is your weight in kilograms divided by your height in metres squared. This calculator converts centimetres, feet, inches, kilograms and pounds for you, shows the BMI value, its standard adult category and the healthy weight range for your height. BMI is a screening measure only — it is not a medical diagnosis.

Visual breakdown

A visual view of your calculation.

Interactive charts arrive here soon.

Smart Insights

Generated from the numbers you entered — no guesswork.

A BMI of 22.5 falls in the “Normal weight” band of the standard adult ranges (under 18.5, 18.5–24.9, 25–29.9, 30 and above).
At 170 cm, a BMI between 18.5 and 24.9 corresponds to roughly 53.5 – 72 kg.
BMI is a screening measure and does not by itself determine an individual's overall health. Results should not be treated as a medical diagnosis.

How to calculate BMI

What the tool does, who it is for and what it cannot tell you.

Body mass index (BMI) compares weight with height. BMI = weight in kilograms ÷ (height in metres × height in metres). If your height is in centimetres, divide it by 100 first. For example, 170 cm is 1.70 m.

For a person weighing 65 kg at 1.70 m, BMI = 65 ÷ (1.70 × 1.70) = 65 ÷ 2.89, or approximately 22.5. This falls in the standard adult healthy-weight band, labelled “Normal weight” in this calculator.

You can also enter height in feet and inches with weight in kilograms or pounds. The calculator converts those measurements before applying the same metric formula, so you do not need to convert them yourself.

How does the BMI Calculator work?

Each step the calculator runs, in plain language.

1
How to use this BMI calculator
Select the Units option that matches your measurements: centimetres and kilograms, feet/inches and kilograms, feet/inches and pounds, or centimetres and pounds.
2
Enter your weight and height
Enter weight in the selected unit. For centimetres, use Height (cm); for feet and inches, enter the two parts separately, such as 5 feet and 7 inches. The height fields for the other system are ignored. The result updates as you change your measurements.
3
Adult BMI categories
Underweight: below 18.5. Healthy weight (labelled “Normal weight” in the result): 18.5 to below 25. Overweight: 25 to below 30. Obesity: 30 or above. These adult categories are not intended for children or teenagers.
4
Understanding your result
Your BMI places your weight relative to your height in a screening band; it is not a diagnosis. BMI does not directly measure body fat or distinguish fat from muscle. The displayed weight range is a formula-based reference, not a personal target. If you have health concerns, consult a qualified healthcare professional.

What to enter in each field

The exact figure each input expects, so the result means what you think it means.

Units: Choose the combination that matches how you know your measurements. The height boxes for the units you are not using are ignored.
Weight: Your body weight in kilograms or pounds, matching the unit choice above. Decimals are allowed.
Height (cm): Used when a centimetre option is selected — for example 170.
Height (feet) and Height (inches): Used when a feet/inches option is selected — for example 5 feet 7 inches.

BMI Calculator formula

The exact maths behind every number on this page.

BMI = Weight (kg) ÷ [Height (m)]²

Weight (kg): Body weight in kilograms (pounds are converted at 1 lb = 0.45359237 kg)
Height (m): Height in metres (centimetres ÷ 100; 1 inch = 2.54 cm)

For pounds and inches, BMI is approximately 703 × weight (lb) ÷ [height (in)]². The 703 factor is rounded; this calculator converts pounds and inches to kilograms and metres using the conversions above, then applies the metric formula.

BMI Calculator calculation example

Hypothetical example: an adult who is 170 cm (1.70 m) tall and weighs 65 kg.

1Height in metres170 ÷ 100 = 1.70 m
2Height squared1.70 × 1.70 = 2.89
3BMI65 ÷ 2.89 = 22.5
4CategoryNormal weight (18.5 to below 25)

The BMI is about 22.5, which sits in the normal-weight band of the standard adult ranges.

Important assumptions

What this calculation includes, and what it leaves out.

Uses the standard adult BMI formula: weight (kg) ÷ height (m)².
Standard adult categories are applied: below 18.5 underweight, 18.5 to below 25 normal weight (healthy weight), 25 to below 30 overweight, and 30 or above obesity.
Unit conversions use 1 inch = 2.54 cm and 1 lb = 0.45359237 kg.
Not intended for children, teenagers, pregnant women or athletes.
BMI is a screening measure and does not by itself determine an individual's overall health. Results should not be treated as a medical diagnosis.

Financial tips

Practical guidance to act on your result.

Measure your height without shoes and weigh yourself at a consistent time of day for a more comparable reading.
BMI bands are for adults. Children and teenagers are assessed against age and sex growth charts instead.
Very muscular people can show a high BMI without excess body fat, and older adults can show a normal BMI with low muscle mass.
Waist measurement and other checks give extra context that BMI alone cannot capture.
Discuss any concerns about your weight or health with a qualified healthcare professional.

Frequently asked questions

Short, direct answers to the questions we hear most.

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Disclaimer

CalPaisa calculators are for general information and planning only. Results are estimates based on the values you enter and standard formulas, and may differ from the figures your bank, employer, or tax authority applies. Nothing here is investment, tax, or legal advice. Please confirm important decisions with a qualified professional. Read our financial disclaimer, learn how CalPaisa works, or tell us about a calculation you think is wrong.

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