Recently, i’ve seen civilization raising the question around the “true” load of amputees. In an effort to calculate their BMI, castle ran into the question: “what would be the weight of my lacking leg/arm?”, “how can I calculation my total body weight, had actually I not been amputated?” as soon as I saw someone apologizing for asking such a “stupid” question, I made decision to look because that an answer. Remember, once it concerns the high quality of life the the amputee, there are no stupid questions.

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Weight of body Segments

The table below lists the load of the person body body segments as weight percent of the full body weight. Data room taken indigenous a scientific document published at the Journal the Biomechanics by DeLeva top top 1996 <1>.


Upper Arm




















 Table 1. Weight of body segments (percentage of full body weight)

Note that values for body segments weight represent a statistics average and also that all people exhibit part deviations from the median in your proportions in between body segments. Also note that there is a clear difference in body segment weight between women and also men. It is not surprising to check out that the average arm, hand and also foot the the average male weighs much more than these same limb segment in a woman’s human body (relative to the complete body weight).

How have to we read these data? because the load of a limb segment is given in percentage of the body weight, we have to take the data entry of interest, main point by the human body weight and also divide by 100. For example, the load of the forearm of a man weighing 92 Kg would certainly be 1.62×92/100 namely, 1.49 Kg. The weight of the thigh of a woman weighing 130 pounds would certainly be 14.78×130/100 namely, 19.2 pounds.

Weight of one Amputated Limb

Let united state now continue to calculation the weight of the amputated limb. For a below-knee foot amputee, this would mean including the weight of the foot come the weight of the lacking section of the leg. An above-elbow arm amputee would have actually to add the weights that the hand, the forearm and the missing part of the top arm. In together calculations we ignore the straightforward conical structure of our limbs and assume that each limb segment is a cylinder that uniform diameter.

To do it clear, stop look into the following situation examples:

Man, below-knee amputee, approximately 3/4 the the foot amputated – in this situation we will add up the weight of the foot (1.37) and three soldier of the foot (0.75×4.33). The resulting weight percentage is 4.62%. Therefore, a man weighing 165 pounds will shed 7.62 pounds complying with a 3/4 leg, below-knee amputation.Woman, above-knee amputee, approximately half the thigh amputated – here we include the weight of the foot (1.29), the complete weight the the foot (4.81) and fifty percent the weight of the thigh (0.5×14.78). The result weight percentage is 13.5%. Therefore, a mrs weighing 58 Kg will lose 7.83 Kg adhering to a half-thigh, above-knee amputation.Woman, below-elbow amputee, roughly 2/3 the the forearm amputated – we add the weight the the hand (0.56) and also two thirds of the forearm (0.67×1.38). The result weight percentage is approximately 1.5%. Therefore, a mrs weighing 140 pounds will lose 2.1 pounds following such a listed below elbow amputation.Man, above-elbow amputee, approximately quarter top arm amputated – we include the weight the the hand (0.61), the full weight the the forearm (1.62) and also quarter the weight of the top arm (0.25×2.71). The resulting weight portion is 2.9%. Therefore, a woman weighing 200 pounds will shed 5.8 Kg following such an above elbow amputation.

BMI Calculations for Amputees

To calculate the Body massive Index (BMI) of an amputee, we first need to know the “true” body load of the amputee i.e. The human body weight had actually he/she no been amputated. After obtaining the weight of the amputated limb as explained in the over paragraph, we might proceed to calculate the “true” body weight of the amputee. This will be given by:


So, if one amputee has lost 3% the his/her body weight as a result of the amputation, the “true” body weight would be the current weight times 100 divided by 97. 5% load loss as result of amputation method a “true” load of 100/95 time the present weight, etc.

To further calculate the human body Mass index (BMI) of one amputee, we have to take the an outcome obtained for the “true” body weight and also plug that in the BMI formula:


Note the 703 counter factor in between the UK and US unit systems.

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Seems complicated? having actually trouble calculating your “amputee BMI”, your “true” weight, or your weight loss because of your amputation? don’t be shy. Ask united state below and we’d be happy to help. If us receive sufficient requests, we’d think about creating one automatic calculator to calculate the weigth of your lost limb and also your BMI.