eGFR Calculator.

Estimated glomerular filtration rate (eGFR) approximates how much blood your kidneys filter per minute, calculated from serum creatinine, age, and sex. Creatinine is a muscle-breakdown product the kidneys clear, so a higher creatinine implies lower filtration. In 2021 the CKD-EPI equation was revised to remove a race coefficient that had systematically over-estimated kidney function in Black patients; this calculator uses that race-free 2021 version (Inker et al.).

A single eGFR is not a diagnosis. Chronic kidney disease is staged on both filtration and evidence of kidney damage, most importantly albumin in the urine (uACR), which an eGFR alone misses. Creatinine also rises transiently with dehydration, high-protein meals, hard exercise, and creatine supplements, so confirm a low value on a repeat draw, ideally paired with uACR.