eGFR Calculator
Estimate eGFR values for health, wellness, and lifestyle planning.
This eGFR calculator estimates glomerular filtration rate - a standard measure of overall kidney function - from serum creatinine, age, and sex, using widely adopted estimating equations like CKD-EPI.
Enter your serum creatinine, age, and sex, and the calculator returns your estimated eGFR.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| Male, 55 years, serum creatinine 1.0 mg/dL | eGFR ≈ 89 mL/min/1.73m² | Applying the 2021 CKD-EPI creatinine equation for a male with creatinine above 0.9 mg/dL gives eGFR ≈ 89 - within the "normal" range. |
| Female, 65 years, serum creatinine 1.1 mg/dL | eGFR ≈ 56 mL/min/1.73m² | Applying the 2021 CKD-EPI creatinine equation for a female with creatinine above 0.7 mg/dL gives eGFR ≈ 56 - in the moderately reduced (stage 3) range, a result that would warrant follow-up with a healthcare provider. |
What eGFR Measures
eGFR estimates how many milliliters of blood the kidneys filter per minute, standardized to a typical body surface area. It's the primary lab value used to stage chronic kidney disease, with lower values indicating progressively reduced kidney function.
eGFR Stages of Kidney Function
An eGFR of 90 or above (with no other markers of kidney damage) is generally considered normal. Values of 60-89 may indicate mildly reduced function, 30-59 moderately reduced, 15-29 severely reduced, and below 15 kidney failure - these stages guide clinical monitoring and treatment decisions.
How to Use the eGFR Calculator
- Open the eGFR Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the egfr calculator works.
Frequently Asked Questions
What does eGFR stand for?
eGFR stands for estimated glomerular filtration rate, a measure of how well the kidneys are filtering blood, commonly used to assess and stage kidney function.
What is considered a normal eGFR?
An eGFR of 90 or above is generally considered normal in the absence of other signs of kidney damage, though normal ranges can vary somewhat by lab and individual factors like age.
What eGFR level indicates chronic kidney disease?
An eGFR consistently below 60 mL/min/1.73m² for three months or more is generally used as one criterion for diagnosing chronic kidney disease, though diagnosis also considers other markers like protein in the urine.
How do I use this egfr calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the eGFR Calculator calculate?
Estimate eGFR values for health, wellness, and lifestyle planning. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this egfr use?
The formula is: eGFR = f(Serum Creatinine, Age, Sex) — CKD-EPI equation. The CKD-EPI equation was developed in 2009 by the Chronic Kidney Disease Epidemiology Collaboration, a research consortium formed specifically to improve on the earlier 1999 MDRD equation, which researchers found became less accurate at higher (healthier) filtration rates. A notable 2021 revision by the National Kidney Foundation and American Society of Nephrology removed a race-based coefficient that had been part of earlier versions, after research found it could contribute to disparities in diagnosis and treatment access.
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Last updated: September 27, 2026.