The tricky part here is finding out your body fat percentage. Here, we are looking at 80 - 12 = 68kg of lean body mass. Then simply subtract this from your total weight to get your lean body mass. This is your fat mass in kilograms (800 x 0.15 = 12kg). Then multiply this number by your total weight.įor example, if you weigh 80kg and have learned that your body fat percentage is 15%, multiply 80 x 0.15. Divide your percent body fat by 100 to make it a decimal. You can also use your body fat percentage to work out your lean body mass, as mentioned above. It should be noted that this will be quite inaccurate but may work well as a rule of thumb or best guess in the first instance.įor an easier version of this, you can always choose an online calculator for lean body mass like the one below. Use the equations below, with all weights in kg and all heights in cm. There is a simple formula you can use for which you will only need your weight and height. This is arguably the most accessible, crudest way of finding out your lean body mass. There is often a trade-off between accessibility and accuracy, with the most accurate methods being beyond many people.
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There are two main ways in which lean body mass is calculated. Some of the methods of lean body mass calculation are more accurate than others, whilst some are more accessible, though we will run through these all shortly. To find out your lean body mass, you often need to know your body fat percentage, though we will run through some methods below in which this isn’t the case.
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This will show them that, although they are gaining total weight, they are not putting on any extra body fat. If you can keep your lean body mass stable whilst bringing your overall weight down, you will know that you’re only losing fat- not muscle or bone density, as is often the case.Īlternatively, those looking to put on weight in the form of muscle will want to build their lean mass at the same rate as their overall weight. Knowing this can help those looking to lose weight maintain their weight loss purely from fat. Basically, if you subtract the weight that comes from fat (your body fat percentage) from your total weight, you will have your lean body mass. Lean body mass is your overall weight minus your weight from body fat.