The Zinda health tools
Same BMI.
Different context.
Put in your height and weight. See why a familiar number deserves a closer look.
See your BMI in context.
Free · no signupExample loaded. Try your own numbers. Nothing is sent to the chat.
One BMI. Two different readings.
Adult categories · shared scale 15–40
The standard chart says “healthy weight”. South Asian guidance already places this in the overweight range—a reason to look beyond the reassuring label.
BMI is a starting point, not a diagnosis. It cannot measure visceral fat.
How to read this comparison
Adult BMI categories need different interpretation during pregnancy, with high muscle mass, or from age 65. Other ancestries can also have lower thresholds. A category alone cannot predict your health.
Source: NICE guidance ↗A separate finding from the research
Similar diabetes incidence.
Different BMI.
This is a fixed study finding, not a conversion of the number you entered.
Comparable age- and sex-adjusted rates of new type 2 diabetes in an English cohort of 1.47 million adults. Not an individual risk estimate.
Study details and source
South Asian estimate: BMI 23.9 (95% CI 23.6–24.0). An observational association, not proof of causation or an equivalence for all metabolic disease.
Caleyachetty et al., 2021 ↗Follow the question
A little more curious?
Go deeper with Ask Zinda. Free with verified email access. Your measurements stay here.
More free tools Waist · body composition · resting energy ↓
Your measurements
Adult educational tools. Enter only what you want to calculate. Measurements stay in this browser and are never included in a guide or clinic signup.
Body-fat and resting-energy formulas use binary sex categories from their original studies; they may not reflect your physiology. The displayed input limits are tool limits, not health thresholds.
Body Mass Index
Your number, with a South Asian perspective
Enter height and weight to see your BMI, its range and what it can mean for your health.
Why the lower thresholds? South Asian adults can develop metabolic health risks at a lower BMI. In the US, the American Diabetes Association advises diabetes screening for Asian American adults from a BMI of 23, rather than 25. NICE starts the overweight range at 23 and the obesity range at 27.5, compared with 25 and 30 in its general adult guidance.
What this can mean for your health
BMI is one clue to health risks such as type 2 diabetes, high blood pressure and heart disease. Your waist measurement and family history help complete the picture.
A useful next step
Start with your measurements above. You can read the result and next steps here without an email or account.
BMI ranges for South Asian adults
Underweight range
Below 18.5
Below overweight threshold
18.5 to below 23
Overweight range
23 to below 27.5
Obesity range
27.5 and above
BMI describes weight relative to height. It does not measure body fat or predict your personal chance of disease. These are adult screening ranges, not a diagnosis. Pregnancy, high muscle mass and age 65 or over need a different or more careful interpretation.
ADA Standards of Care, screening ↗NICE BMI guidance ↗NHS health impact guidance ↗
Waist & Proportion
A screening clue, not a scan
Enter waist and height.
Waist-to-hip: Enter waist and hip
For adults with BMI below 35, NICE uses waist-to-height ratio alongside BMI. Its general target is a waist less than half your height. This does not diagnose disease or quantify visceral fat.
Estimated Body Fat
An approximation with important limits
Enter adult age, height, weight and formula sex.
The Deurenberg equation estimates body fat from BMI, age and sex. It is not an individual measurement or a South Asian calibrated diagnosis. It cannot establish muscle loss or sarcopenic obesity.
We suppress estimates outside this tool’s BMI range of 15–40 or plausible output range. Pregnancy, unusual muscle mass and changing body composition can make it misleading.
Resting Energy
Estimated energy at rest
Enter age 19–78, height, weight and formula sex.
The Mifflin–St Jeor equation estimates resting energy expenditure. It is not a calorie prescription or a prediction of weight change. Daily activity and individual physiology change actual needs.
These results cannot diagnose diabetes, cardiovascular disease or other conditions. A value that looks reassuring does not replace clinical evaluation. Discuss symptoms or concerns with your clinician.
A little preparation. A better conversation.
Want to go beyond the number?
Understand what BMI and waist measurements can tell you, where they fall short and what to discuss next.
Measurement instructions · result limitations · conversation prompts
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