Ratio - Body Fat by Photo

Snap one photo and get your body fat percentage, FFMI, lean mass and BMR in seconds. Built for lifters who track progress, not guesswork. Start your free week.

Ratio estimates your body fat percentage from a single photo — no calipers, no gadgets, no guessing.

Your body is the most honest reference you have. Ratio reads it and turns it into the numbers that actually matter for training.

HOW IT WORKS

1. Set up once: sex, age, height.
2. Take one front photo, abs braced. Already have a gym photo? Just upload it.
3. Get your full body composition breakdown in seconds.

Add optional photos (relaxed front, side profile) for a sharper estimate.

WHAT YOU GET • Body fat % — one clear number, front and center • FFMI — the index that actually reflects how muscular you are • Lean mass and fat mass in kg — your weight, broken down • BMR — resting energy expenditure via Katch-McArdle, based on lean mass rather than total weight

Every number comes with a visual gauge and a plain comparison line, so you instantly know where you stand.

TRACK YOUR PROGRESS Ratio saves every estimate. Browse your history and compare any two dates side by side to see how your physique is actually changing over time.

BUILT FOR LIFTERS Ratio is made for people who already train and care about progress. Weight pulls automatically from Apple Health when available, so every estimate stays up to date.

MEMBERSHIP Ratio Premium is an auto-renewable subscription, offered as a monthly or a yearly plan, and it starts with a free 1-week trial. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is canceled at least 24 hours before the end of the current period, and your Apple Account is charged for the renewal within the 24 hours before the current period ends. You can manage or cancel your subscription in your Apple Account settings. Any unused portion of a free trial is forfeited when you purchase a subscription.

—

Ratio provides estimates for informational and fitness purposes only. It is not a medical device, it takes no physical or clinical measurement, and it does not provide medical advice, diagnosis, or treatment. Seek a doctor's advice in addition to using this app, and before making any medical decisions. Every number shows its formula and its sources in the app (Account → Method & sources).

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ratio-coral.vercel.app/privacy