Lean Body Mass Calculator & BMI Calculator for Athletes

Lean Body Mass Calculator (Boer Formula) & BMI Calculator

When you're training hard, the scale lies. You drop a few pounds and panic, or gain a few and assume it's fat — but muscle, water, and glycogen all swing the number around. That's why lean body mass (LBM) matters more than weight alone, and why pairing it with a solid bmi calculator gives you a much sharper picture of where you actually stand. This tool uses the Boer formula, one of the most respected equations for estimating LBM, to break down how much of you is actually working tissue versus fat. Whether you're cutting for a meet, bulking through an off-season, or fine-tuning your physique before competition, knowing your

Lean Body Mass Calculator (Boer Formula) & BMI Calculator 사용 방법

Pick your unit system. Switch between metric (kg, cm) and imperial (lb, in) so you can enter numbers the way your gym scale and tape measure already show them.
Enter your weight. Use a recent morning weigh-in, ideally fasted and after the bathroom, for the most consistent reading day to day.
Enter your height. Measure barefoot against a wall if you can. Even a half-inch off changes the Boer estimate noticeably.
Select your sex. The Boer formula uses different coefficients for males and females because of natural differences in muscle and fat distribution.
Hit Calculate. You'll get your estimated lean body mass in kg and lb, ready to use for protein targets, training loads, and macro planning.
Track over time. Re-run it every two to four weeks. The trend line tells you whether your cut is preserving muscle or your bulk is adding the right kind of weight.

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What is the Boer formula?

It's a height- and weight-based equation developed by Dr. Peter Boer to estimate lean body mass. It's widely used in sports science and clinical settings because it tracks well with more expensive methods like DEXA for most adults.

How is this different from a BMI calculator?

BMI just compares your weight to your height — it can't tell muscle from fat. Lean body mass estimates the non-fat portion of you, which is far more useful if you carry above-average muscle.

Should I use this or a body fat calculator?

Use both. A body fat calculator estimates the fat percentage; this tool estimates the lean tissue. Together they give you a complete composition snapshot.

How accurate is the Boer estimate for muscular builds?

It's solid for most trained adults but can slightly underestimate LBM in very heavily muscled lifters. Pair it with caliper readings or a DEXA scan once or twice a year to calibrate.

How often should I recalculate?

Every two to four weeks during a cut or bulk is plenty. Daily checks add noise without signal — water and food weight will dominate short-term swings.

Can I use this to set my protein intake?

Yes. A common target for athletes is roughly 1.6 to 2.2 grams of protein per kilogram of lean body mass, which often gives a more accurate floor than scaling off total bodyweight.

Does this tool work for women planning a pregnancy?

The Boer formula isn't validated for pregnancy. If you're tracking a cycle or expecting, our ovulation calculator and pregnancy due date calculator are better fits — and a calorie deficit calculator should be paused during gestation.

Lean Body Mass Calculator (Boer Formula) & BMI Calculator

Lean Body Mass Calculator (Boer Formula) & BMI Calculator 사용 방법

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