CKD-EPI 2021 · race-free

eGFR Calculator

Estimates kidney filtration rate from creatinine, and — if you have it — cystatin C for the most accurate reading available without a direct clearance test.

Your values

Sex

Age55 yrs

18100

Serum creatinine

From a standard basic/comprehensive metabolic panel.

Add cystatin C (more accurate)

Serum cystatin Cmg/L

Especially useful if muscle mass is unusual for age — very muscular, frail, amputee, or malnourished — since it isn't affected by muscle mass the way creatinine is.

Add height & weight (absolute GFR)

Heightcm

Weightkg

All standard eGFR results are indexed to a 1.73m² body surface area. This de-indexes to an absolute mL/min figure, sometimes needed for drug dosing.

Result

—

Enter your values to see a result.

Equations compared

—

On accuracy: even the best (combined) equation lands within 30% of a true measured GFR in roughly 90–92% of people — excellent for clinical use, but an estimate, not a measurement, for any one person.

Equations: CKD-EPI 2021 race-free creatinine, cystatin C, and creatinine–cystatin C (Inker et al., NEJM 2021). Not a diagnosis — CKD staging requires abnormal values persisting >3 months or corroborating markers (albuminuria, imaging, biopsy). Not validated for pregnancy, acute kidney injury, unusual body habitus, or age under 18.