Body Fat Calculator - LeanFuel

Most protein calculators use your total body weight — so at 220 lbs, they tell you to eat 220g of protein a day. That's wrong, and you know it.

LeanFuel uses the U.S. Navy Method to calculate your actual body fat percentage from simple tape measurements. Then it gives you a protein target based on your lean body mass — the muscle you actually need to fuel.

HOW IT WORKS
1. Enter your measurements (neck, waist, height, weight)
2. Get your body fat %, lean mass, and fat mass instantly
3. Receive a personalized daily protein target
4. Log your protein and hit your goal every day

SMART PROTEIN TARGETS
Your target adjusts based on your fitness goal and activity level:
- Build Muscle: higher protein to fuel muscle growth
- Lose Fat: extra protein to preserve lean mass in a deficit
- Maintain: moderate protein for steady body composition
- Recomp: optimized for simultaneous fat loss and muscle gain

TRACK YOUR BODY RECOMPOSITION
- Body fat % over time (watch it go down)
- Lean mass over time (watch it go up)
- Protein target history with each measurement
- Real body recomp data — not just the scale

DAILY PROTEIN LOGGING
- 100+ built-in foods with verified protein values
- Quick-log in one tap or add your own custom foods
- Track daily grams vs. your target
- Watch your protein ring fill up throughout the day

STAY MOTIVATED
- Earn XP for logging, hitting targets, and measuring
- Level up through 15 ranks from Beginner to Recomp Master
- Unlock 19 achievement badges for streaks and milestones
- Maintain daily log streaks and target streaks

BUILT FOR YOUR LIFESTYLE
- Beautiful dark mode design
- BMI calculator included
- Metric and imperial units
- 30 languages supported
- No account required — your nutrition data stays on your device

Try LeanFuel free for 7 days. Then continue with a weekly ($4.99/week) or yearly ($29.99/year) subscription to unlock unlimited measurements, full charts, and all features.

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