Lean Body Mass Calculator
Find Your Lean Body Mass Fast
Want to see how much of your weight is lean muscle, bone, and organs—not fat? Our Lean Body Mass Calculator gives you that in seconds. Great for anyone tracking muscle gains or carefully losing fat.
How It Works
Just enter:
- 📏 Gender
- ⚖️ Weight (kg or lbs)
- 📐 Height (cm or ft/in)
- Optional: Body fat % (if you know it)
Then hit Calculate. We use trusted formulas—like the Boer equation—to estimate your lean body mass (LBM) and fat-free mass.
Why LBM Matters
- Training insight: See if you’re keeping muscle while losing fat
- Metabolic health: LBM relates to how many calories your body burns at rest
- Supplement planning: Better way to tailor protein and strength goals
Lean mass can range between 60–90% of your total weight, usually higher in men.
Top Formulas Behind the Scenes
We use proven equations:
- Boer formula (most accurate)
- Men:
0.407 × weight(kg) + 0.267 × height(cm) – 19.2 - Women:
0.252 × weight + 0.473 × height – 48.3
- Men:
- Or use your Body Fat %:
Lean Mass = Body Weight × (1 – Body Fat %)
Where Lean Body Mass Beats BMI
- BMI only links weight to height, lumps fat and muscle
- LBM hones in on muscle + organs + bones
- Ideal if you’re muscular or sculpting your physique
Tips to Grow Lean Mass Without Gaining Fat
- 🍗 Eat enough protein
- 🏋️♂️ Do strength training regularly
- 🧘♀️ Cool down with the right amount of cardio
- 🔁 Track weekly weight and LBM changes
- 🚰 Hydrate well—dehydration may skew your results
Quick FAQ
Q: What’s lean body mass vs fat-free mass?
A: LBM includes muscle, bone, organs plus essential fat in cells. Fat-free mass excludes all extractable fat.
Q: Is this as accurate as a DEXA scan?
A: No. DEXA and hydrostatic weighing are more precise. Our tool offers a reliable and easy estimate.
Why Choose Our Calculator
- ✅ Clear, no‑fluff interface
- ✅ Based on recognized equations (Boer, fat‑based)
- ✅ No sign‑up or ads
- ✅ Switch units (kg/lbs, cm/ft‑in)
- ✅ Works smoothly on mobile
Want More Body Tools?
- Body Fat Calculator – check percent fat
- BMI Calculator – overall weight-to-height index
- Basal Metabolic Rate (BMR) Calculator – daily calorie needs