Lean Body Mass Calculator · Practical guide
How Much Protein Per Pound of Lean Body Mass?
Basing protein on lean mass, not total weight, keeps the target honest whether you are lean or carrying extra fat.
At a glance
The Short Answer
Most guidelines for active adults land between 0.6 and 1.0 grams of protein per pound of lean body mass per day — around 0.6-0.8 g for general fitness and up to 1.0 g when building muscle or cutting calories. First find your lean body mass with the calculator above, then multiply.
Interactive tool
Lean Body Mass Calculator
Enter your own values, then compare the result with the examples below.
Results
Why Lean Mass Instead of Total Weight?
Fat tissue needs almost no protein to maintain. Dosing protein by total body weight overfeeds the target for anyone carrying extra fat — a 250 lb person and a 180 lb person at the same height may have nearly identical lean mass and therefore nearly identical protein needs.
Protein Targets by Lean Body Mass
| Lean Body Mass | General Fitness (0.7 g/lb) | Muscle Building (1.0 g/lb) |
|---|---|---|
| 100 lb | 70 g/day | 100 g/day |
| 130 lb | 91 g/day | 130 g/day |
| 160 lb | 112 g/day | 160 g/day |
Worked Example
A 5'4" woman at 150 lb has an average estimated LBM of about 101 lb (the average of the Boer, James, and Hume formulas). Her daily protein target is roughly 71-101 g depending on training — about 25 g at breakfast, lunch, and dinner plus a snack gets most people there.
Putting It Into Practice
- Spread protein across 3-4 meals; roughly 25-40 g per meal is absorbed and used well.
- On a calorie deficit, aim for the upper end (0.8-1.0 g/lb) to protect muscle while losing fat.
- Recheck your LBM after significant weight change — your target moves with it.
Frequently Asked Questions
Is 1 gram per pound of lean mass too much protein?
For healthy kidneys, no — studies routinely use 0.7-1.0 g per pound of lean mass in athletes without harm. Anyone with kidney disease should follow their doctor's guidance instead.
Should sedentary adults use lean mass too?
The general recommendation for sedentary adults is about 0.36 g per pound of total body weight. Using lean mass mostly matters for active people or those dieting, where needs are higher.
How do I find my lean body mass without a body fat test?
Use the calculator above — it estimates LBM from your gender, height, and weight using the Boer, James, and Hume formulas, no calipers or scans required.
Does protein timing matter as much as total intake?
Total daily intake matters most. Even distribution across meals helps muscle protein synthesis, but hitting your daily gram target consistently beats any timing trick.