GFR Calculator
Estimate kidney function (eGFR) from serum creatinine, using the 2021 race-free CKD-EPI equation.
Formula: 2021 CKD-EPI creatinine equation (race-free).
A screening estimate only — kidney function assessment requires a clinician's interpretation alongside other tests.
Worth Knowing
This estimates glomerular filtration rate — a core measure of kidney function — from serum creatinine using the 2021 CKD-EPI equation, which was revised specifically to remove the race coefficient earlier versions included. eGFR is an estimate, not a direct measurement, and creatinine is affected by muscle mass, so it can misread very muscular or very frail people. It's meant to be interpreted by a clinician alongside other tests; this tool is for reference and education only.
How to Use
- Enter Gender into the first field of the GFR Calculator.
- Fill in the rest: Age, Serum creatinine.
- Your result appears instantly as you type — there's no submit button or page reload.
- A screening estimate only — kidney function assessment requires a clinician's interpretation alongside other tests.
Formula
2021 CKD-EPI creatinine equation (race-free).