eGFR Calculator

An eGFR of 90 or above is classified as G1 (normal or high filtration). Values of 60-89 represent mild reduction. Most clinicians define CKD as an eGFR persistently below 60. However, an eGFR between 60 and 89 with no other kidney damage markers is often considered within normal variation, especially in older adults.

Earlier CKD-EPI equations included a separate multiplier for self-reported Black race, based on average differences in muscle mass and creatinine generation. This was criticized for potentially delaying treatment in Black patients by overestimating GFR. The 2021 update removed the race coefficient to produce a single unbiased equation that applies equally to all patients.

Yes. Creatinine levels fluctuate with hydration, diet (high meat intake raises creatinine), exercise intensity, and medication use. A single reading can be misleading. CKD is diagnosed only when low eGFR persists for more than 3 months. If your result is unexpectedly low, repeat the test after adequate hydration and a few days of normal activity.

This calculator replicates the same CKD-EPI 2021 formula your laboratory uses. However, the accuracy of your result depends on the accuracy of the serum creatinine value you enter. Laboratory measurements have their own imprecision, and this tool cannot account for factors your doctor considers alongside the number. Always discuss kidney function results with a qualified clinician.