eGFR Calculator (CKD-EPI 2021)
eGFR estimates how much blood your kidneys filter each minute. Australian labs report it with every creatinine, but it is capped at "> 90" and assumes average muscle mass, which is why muscular people and creatine users often see a misleadingly low number.
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Inker LA et al. N Engl J Med 2021. Not valid under 18, in pregnancy, or with rapidly changing kidney function. Muscular people and creatine users: ask for cystatin C.
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Create a free accountFrequently asked questions
What is a normal eGFR?
Above 90 mL/min/1.73m² is normal. 60 to 89 is mildly reduced and often normal for age. Below 60 for three months or more defines chronic kidney disease.
Why is my eGFR low if I am muscular?
Creatinine comes from muscle. More muscle means more creatinine, which the equation reads as less filtration. A cystatin C test, which is independent of muscle mass, gives a truer estimate.
Does creatine supplementation lower eGFR?
It raises creatinine by roughly 10 to 20 µmol/L and so lowers the calculated eGFR, without any change in real kidney function.
Which equation do Australian labs use?
Most Australian labs moved to the race-free CKD-EPI 2021 equation, the one used here. Older reports may use CKD-EPI 2009, which gives slightly different values.
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Educational tool. Results depend on the accuracy of the inputs and the formulas cited; they do not replace your laboratory report or your doctor's interpretation.