BMI Calculator: Weight Index

BMI Calculator helps you understand your body mass index and track it over time. Fast, private, and free.

Enter your height and weight and get your BMI instantly, with a clear, color-coded category and a plain-language explanation of what the number means. Switch between metric and imperial units, and choose the BMI standard that fits you, including WHO/CDC cutoffs and WHO Asian action points.

WHAT YOU CAN DO
• Calculate BMI in seconds with a clean, accessible interface
• See the healthy weight range for your height, shown in your units
• Track every result in your history and watch the trend chart over weeks and months
• Add Home Screen and Lock Screen widgets to see your latest number at a glance
• Use Spotlight and Siri Shortcuts to calculate without even opening the app
• Sync weight and height with Apple Health so your data stays consistent across apps
• Designed for adults: clear, non-judgmental, and person-first throughout

REMOVE ADS (optional, one-time purchase)
The free version shows a single, non-personalized banner ad. Prefer none? One tap removes it for good. No subscription, ever.

PRIVATE BY DESIGN
Your measurements stay on your device. No account, no sign-up, and no selling of your data. Your health data is never used for ads.

A NOTE ON HOW TO USE THIS APP
BMI is a screening tool, not a diagnosis. It is a general indicator that does not measure body composition directly and does not account for muscle mass, bone density, or other individual factors. This app is for general informational and educational purposes only and is not a substitute for professional medical advice. Please talk with a qualified healthcare provider about your health and before making changes to diet or exercise.

Download BMI Calculator and start tracking your numbers today.