how to convert mg/m2 to mg/kg

Questions and answers on how to convert things from one unit or system to another


how to convert mg/m2 to mg/kg

Postby needhelp » Tue Aug 26, 2008 11:32 pm

ex. 1000 mg/m2

Postby thejhw » Wed Aug 27, 2008 9:11 pm

Expand your abbreviations.
if you have 1000 milligrams, which is equal to 1 gram, spread over 1 square metre, what is it you want to convert?

You are asking for the number of milligrams per kilogram.
THat's just the same as trying to convert pounds (weight) per acre to pounds per ton. It doesn't make sense.
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Joined: Wed Aug 27, 2008 5:23 pm

re: how to convert mg/m2 to mg/kg

Postby der100102 » Mon Sep 15, 2008 8:16 am

I assume this is for drug dosages, where some are specified as mg/kg (related to body mass), while some are specified as mg/m2 (related to "body surface area" or BSA).

So you need to find someone's BSA. There are several formulas, all of which take into account height in addition to mass. One of the easiest is Mosteller's formula.

BSA (m²) = ( [Height(cm) x Weight(kg) ]/ 3600 )½
e.g. BSA = SQRT( (cm*kg)/3600 )

or in inches and pounds:
BSA (m²) = ( [Height(in) x Weight(lbs) ]/ 3131 )½

I'm 6' 0" tall (183 cm) and weigh 175 lbs (80 kg). My BSA is 2.02.
My wife is 5'4" tall (163 cm) and weighs 125 lbs (57 kg). Her BSA is 1.6.

For other formulas, try googling "body surface area".

Hope this helps.

Postby Guest » Wed Nov 19, 2008 1:59 am

if you have 1000 mg/m2 and you want to give the dose based on mg/kg you divide the original amount by 30. For example 1000 mg/m2 is equal to 33.33 mg/kg. Hope that helps.

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