Enter your Age, Gender, Race, and Serum Creatinine level, then choose a Calculation Method (CKD-EPI or MDRD) to get your Estimated GFR — plus your CKD Stage, Kidney Function percentage, and a plain-language Clinical Interpretation of what your result means.
Estimated GFR
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CKD Stage
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Kidney Function
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Clinical Interpretation
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Glomerular Filtration Rate (GFR) is the best overall measure of kidney function. It estimates how much blood your kidneys filter each minute. Normal GFR is around 100 mL/min/1.73m², and values below 60 may indicate chronic kidney disease.
GFR results are classified into 5 stages: Stage 1 (90+) indicates normal or high function, Stage 2 (60-89) shows mild decrease, Stage 3a (45-59) and 3b (30-44) indicate moderate decrease, Stage 4 (15-29) shows severe decrease, and Stage 5 (<15) indicates kidney failure.
The CKD-EPI 2021 race-free equation is now recommended by major kidney organizations. It provides more accurate estimates across different populations without using race as a factor, making it the preferred choice for clinical use.
eGFR calculations are estimates based on creatinine levels and demographic factors. They are generally accurate for screening and monitoring, but direct measurement of GFR may be needed in some cases for precise assessment.
Yes, certain medications can affect creatinine levels and eGFR calculations. These include ACE inhibitors, ARBs, diuretics, and some antibiotics. Always inform your healthcare provider about all medications when interpreting results.
A single low GFR reading doesn't necessarily mean chronic kidney disease. CKD is diagnosed when eGFR is persistently below 60 mL/min/1.73m² for more than 3 months, or when there's kidney damage with any GFR level.
Some decline in GFR with aging is normal, typically about 1 mL/min/1.73m² per year after age 40. However, rapid decline or values below 60 warrant medical evaluation to rule out kidney disease.