Health check
See where you stand before a doctor's visit or a new fitness plan.
BMI Calculator
Enter your height and weight. You get your BMI, both category systems and a healthy weight range.
Your files stay with you. Your files never leave your browser. This tool runs on your device: nothing is uploaded to our servers, so there is nothing for us to store or see.
How to use it
- Choose centimetres or feet and inches for height.
- Choose kilograms or pounds and enter your weight.
- Read your BMI, the categories and the healthy weight range for your height.
Where it helps
Weight goal
Read the healthy weight range for your height on both scales.
Family
Check parents' or partners' numbers without sending data anywhere.
Good to know
Stays in your browser
Numbers you type are worked out on your device and never sent to our servers.
Not a diagnosis
BMI ignores muscle, age and where fat sits.
Measure well
Height without shoes, weight in the morning.
Questions people ask
How do you calculate BMI, and what is a healthy BMI for Indians?
Enter your height in centimetres or feet and inches and your weight in kilograms or pounds. You get your BMI, the WHO category and the Asia-Pacific category used widely in India, plus a healthy weight range for your height on both scales. It's for adults aged 18 and over and is a screening number, not a diagnosis.
- 2 Category systems. WHO and Asia-Pacific.
- 18.5-22.9 Asia-Pacific healthy. Common in India.
- cm or ft kg or lb. Use what you know.
- 18+ Adults only. Children use growth charts.
How is BMI calculated?
BMI is your weight in kilograms divided by your height in metres squared. Someone who weighs 70 kg and is 1.70 m tall has a BMI of 70 divided by 2.89, which is about 24.2. The tool converts feet, inches and pounds for you, so you can enter whatever you know.
Why are two categories shown?
The WHO bands call a BMI of 25 to 29.9 overweight. WHO's Asia-Pacific guidance, widely used in India, starts overweight at 23 and obese at 25, because Asian adults tend to face more health risk at a lower BMI. Both are shown so you can discuss either with your doctor.
What is a healthy BMI for Indians?
Under the Asia-Pacific bands, 18.5 to 22.9 is the healthy range, 23 to 24.9 is overweight and 25 or more is obese. Many Indian doctors and health programmes use these cut-offs. The tool shows the matching healthy weight range for your height so you have a clear target.
Is BMI accurate?
It's a quick screening number, not a diagnosis. It doesn't know about muscle, bone, age, sex or where fat sits, so a muscular athlete can show as overweight. Waist size, blood pressure and blood tests tell a doctor much more about your actual health risk.
Can children use this calculator?
No. The bands here are for adults aged 18 and over. Children and teenagers are still growing, so doctors compare their BMI against growth charts for their age and sex. Ask your paediatrician or school health check to read a child's figure correctly. Adult bands would give a misleading result for a child.
How do I enter my height in feet and inches?
Tap 'Feet and inches' and fill in both boxes, for example 5 feet and 6 inches. The tool converts it to centimetres behind the scenes. If you only know your height in centimetres, keep the default option. Measure without shoes for the most accurate result.
What healthy weight range does it show?
It shows the weight range that would put you in the healthy band for your height, once on the WHO scale (BMI 18.5 to 24.9) and once on the Asia-Pacific scale (18.5 to 22.9). At 165 cm, for example, the Asia-Pacific range is roughly 50 to 62 kg.
Why does waist size matter more than BMI?
Fat around the stomach is linked more closely with diabetes and heart disease than overall weight. Two people with the same BMI can have very different waist sizes and risks. Many Indian guidelines suggest keeping the waist under about 90 cm for men and 80 cm for women.
Is BMI different for men and women?
The formula and the adult bands are the same for both. Women usually carry more body fat than men at the same BMI, which is one reason BMI is only a starting point. A doctor may weigh this, along with age and family history, when reading your figure.
Does BMI work for older adults?
It's less reliable after about 65, because people lose muscle and height with age. Some doctors are comfortable with a slightly higher BMI in older adults. Use the result as one input and talk to a doctor rather than aiming for a particular number. Strength and staying active matter a great deal at that age.
What is underweight on the BMI scale?
Below 18.5 is underweight on both scales. A low BMI can point to poor nutrition, an illness or a thyroid problem, so it's worth checking with a doctor, especially if you've lost weight without trying. The tool shows how many kilograms would reach the healthy range.
Can I use BMI during pregnancy?
No. Weight rises naturally during pregnancy, so BMI doesn't describe health then. Doctors use your pre-pregnancy BMI to suggest a healthy amount of weight gain. Ask your gynaecologist for a target and use their weight charts during check-ups. Come back to this calculator a few months after the baby is born.
Is my height and weight stored?
No. The calculation runs in your browser and nothing you enter reaches our servers or is saved after you close the page. There's no sign-up. That makes it safe for checking family members' numbers or using it at a shared computer in a gym or clinic.
Does it work on a phone?
Yes. Tap your unit choices, type your height and weight with the number keypad, and the BMI and both categories appear straight away. It works in any mobile browser without an app, so you can check it in a clinic waiting room or at the gym.
Is the BMI calculator free?
Yes. It's free with no sign-up and no limit on use. It's one of the free calculators from Marketiism. Clinics using Marketiism can also take bookings and send WhatsApp reminders, but this calculator works on its own with no account at all. Use it as often as you like to track progress.
Want this inside your own account?
Marketiism keeps your invoice numbers, GST reports, UPI payment links and WhatsApp reminders in one place. Leave your details and we'll call to set it up for your business, or start the trial yourself.
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