What Is a Healthy BMI?
The healthy adult BMI range is 18.5 to 24.9 — and it is the same for women and men. See the WHO chart and where BMI has its limits.
Read guideBMI Calculator with BMR & TDEE Tracking
Instant BMI, your healthy weight range, and daily calorie needs — in one clean app.
Enter your height and weight to get your Body Mass Index and WHO category in seconds. Then check your BMR and TDEE (daily calories), see the ideal weight range for your height, estimate body fat, and track your BMI over time. This is general health information, not medical advice.
- No account, no sign-up — your data stays on your device
- Private iCloud sync across your iPhones · metric and imperial
- Free to download · one-time lifetime unlock · no ads
Download the BMI Calculator Free
BMI Calculator BMR TDEE Track is free to download on iOS 18 and above. Get your BMI, BMR, TDEE, ideal weight range and body fat estimate with no account and no server — everything is calculated on your device. Unlock the full experience with a one-time lifetime purchase.
Free to download · iOS 18+
See the App in Action
Enter height and weight in kg/cm or lb/in, add age and sex, and tap Calculate.
See your BMI, its WHO category, and the healthy weight range for your height.
Get your BMR and daily calorie needs (TDEE) for five activity levels.
Track your BMI over time with 30, 90 and 365-day views — all stored privately.
How the App Works
1
Enter your height and weight
On the BMI tab, dial in your height and weight using metric (kg/cm) or imperial (lb/in), then add your age and sex. The app remembers your last entry, so returning takes only a moment.
2
Get your BMI and category
Tap Calculate to see your Body Mass Index instantly, along with its WHO category — Underweight, Normal, Overweight or Obese — and the healthy weight range for your height. An estimated body fat percentage is shown too.
3
Check your BMR and TDEE calories
Switch to the BMR tab to see your Basal Metabolic Rate from the Mifflin-St Jeor formula, then pick from five activity levels to get your TDEE — the daily calories your body uses. This is general information, not a prescription.
4
Track your progress over time
Save your results and watch your BMI trend on the History tab with 30, 90 and 365-day windows, plus your highest, lowest and average. Everything stays on your device and syncs privately via iCloud.
Guides: Understanding BMI, BMR, TDEE and Body Fat
Clear, honest answers to the most common questions about BMI, healthy weight, daily calories and body fat — written to inform, not to diagnose.
How to Calculate BMI
The BMI formula in both metric and imperial, with worked examples — or let the app do it for you in under five seconds.
Read guideBMR & TDEE: How Many Calories a Day?
The Mifflin-St Jeor formula, five activity multipliers, and the difference between maintenance and a moderate deficit — explained clearly.
Read guideWhat's Your Ideal Weight?
There is no single perfect number — there is a healthy weight range for your height. See an example table for 160, 170 and 180 cm.
Read guideEstimate Your Body Fat Percentage
The app estimates body fat with the Deurenberg formula from your BMI, age and sex — a useful guide, honestly explained against methods like DEXA.
Read guideFrequently Asked Questions
What is a healthy BMI range?
For adults, a healthy BMI is 18.5 to 24.9, and it is the same for women and men. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese. BMI is a screening guide, not a diagnosis. Learn more
How is BMI calculated?
In metric, BMI is weight in kilograms divided by height in metres squared (kg ÷ m²). In imperial, it is weight in pounds divided by height in inches squared, times 703. The app calculates it instantly in either unit system. Learn more
How many calories should I eat a day?
As a general guide, eat around your TDEE to maintain weight. TDEE is your BMR (from the Mifflin-St Jeor formula) times an activity factor of about 1.2 to 1.9. A common moderate deficit for weight loss is roughly 500 kcal below TDEE. This is general information, not personal advice. Learn more
What is my ideal weight?
Ideal weight is a range, not a single number — the weights that keep your BMI between 18.5 and 24.9 for your height. At 170 cm, for example, that is roughly 53 to 72 kg. The app shows your exact range for your height. Learn more
How does the app estimate body fat?
It uses the Deurenberg formula, which estimates body fat percentage from your BMI, age and sex — no calipers needed. It is a reasonable estimate, not a precise measurement like a DEXA scan. Learn more
Is my data private?
Yes. There is no sign-up and no server — every calculation happens on your device, and your history syncs privately through your own iCloud account. There is no tracking, no ads and no data collection.
Does it support kg and lbs?
Yes. The app supports both metric (kg/cm) and imperial (lb/in) units for height and weight. You can switch between them at any time, and results are shown in the units you choose.
Which languages does the app support?
The app is available in 39 in-app languages, which you can switch between instantly without restarting. It also supports Dark Mode and requires iOS 18 or later.
Know Your Numbers, Privately
Download BMI Calculator BMR TDEE Track free and get your BMI, healthy weight range, BMR, TDEE and body fat estimate in seconds. No account, on-device, with private iCloud sync. This app provides general health information, not medical advice.