Step by step
- Choose kg / cm or lb / ft in in the calculator on this page.
- Enter your weight and height using your iPhone keyboard.
- Read your BMI, its WHO category, and the healthy weight range for your height.
- Optionally bookmark the page in Safari so you can open it again anytime.
At a glance
| Method | Needs install | What you get |
|---|---|---|
| Browser tool on this page | No | BMI, WHO category, and healthy weight range |
| Phone calculator app | No | Manual division only (weight ÷ height²) |
| Dedicated health app | Yes | Long-term tracking and account setup |
Where to find it on your device
- Safari: Share button > Add to Home Screen
Related questions
How do I measure BMI on iPhone without an app?
Open this page in Safari, pick lb / ft in or kg / cm, and type your weight and height. The calculation runs in your browser with no sign-up.
Can I calculate BMI on iPhone using the built-in Calculator?
Yes, if you use metric units: divide your weight in kg by your height in meters twice. Using the tool here avoids manual math and shows the WHO category.
Does this BMI calculator work for children or during pregnancy?
No. Children and teens need age- and sex-specific charts, and BMI is not used during pregnancy. Consult a health professional in those cases.
More questions: bmi calculator
- How to Calculate BMI
- What Is BMI?
- What Is a Healthy BMI?
- What Weight Should I Be for My Height?
- Is the BMI Calculator Different for Women and Men?
- Can BMI Be Used for Children and Teens?
- Can BMI Be Used During Pregnancy?
- How Does BMI Apply to Seniors?
- Why Is My BMI High When I Have Muscle?
- BMI Calculator vs. Body Fat Percentage: Which Should You Use?
- How to Use a BMI Calculator in kg and Feet or cm
Open the full bmi calculator →
Updated November 14, 2026.