eGFR Calculator
Estimate your glomerular filtration rate quickly using serum creatinine and basic personal data.
CKD-EPI 2021 Equation (race-free)
📋How to Use GFR Calculator?
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Enter your age, sex, and serum creatinine level.
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Select creatinine units (mg/dL or µmol/L).
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Click “Calculate” to see your eGFR result.
The eGFR online calculator will give you an estimated glomerular filtration rate, which is a useful measure to assess your kidney function. The first thing to enter will be your current age, as the glomerular filtration rate gradually decreases with age. Then, you will select male or female, depending on your sex, to adjust the calculation. Next, you will enter your latest serum creatinine value, either in mg/dL or µmol/L, from a blood test. The eGFR calculator then immediately uses the CKD-EPI equation to create your result of eGFR in mL/min/1.73m².
You will see your exact estimated glomerular filtration rate, in addition to a category of either normal (90 and above), mildly decreased, moderately decreased, or severely decreased. Since you can use this reader regularly, you can check glomerular filtration rate occasionally and note how it compares to normal eGFR for your age range.
Useful Tips💡
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Always use the most recent serum creatinine value from a blood test.
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Repeat the calculation every 3–12 months or as advised by your physician.
How the eGFR Calculation Works
Our GFR calculator allows the use of the most accurate and commonly used method for evaluating kidney function in adults, the 2021 CKD-EPI creatinine equation. The equation incorporates serum creatinine level, age, and sex, with no race-based adjustments. Results are given in mL/min/1.73m² and reflect how well the kidneys filter blood. The performance of the CKD-EPI equation is superior to older methods across a range of glomerular filtration rate levels, and the CKD-EPI equation is widely accepted and recommended by the major nephrology organizations.
Practical Applications📊
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Monitor kidney function trends during routine health checks.
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Compare your eGFR to normal values for your age group.
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Support early discussions with a doctor about kidney health.
Questions and Answers
What is an eGFR calculator?
An eGFR calculator determines the glomerular filtration rate that utilizes serum creatinine, age, and sex. It gives a fair assessment of kidney function and will recognize a potential decline before symptoms present.
How is normal GFR by age determined?
In young adults, a normal eGFR by age is often above 90 mL/min/1.73m² and tends to decrease slowly after 40 years of age. A value of 60-89 could still be considered "normal" in older individuals who have not otherwise progressed in kidney disease.
What does a low estimated glomerular filtration rate mean?
An estimated glomerular filtration rate of less than 60 for three months, or more may indicate chronic kidney disease. Values below this threshold indicate an impairment in kidney function and require follow-up with a physician.
Can I calculate eGFR without seeing a doctor?
YCertainly, the online eGFR calculator provides a solid estimate from standard inputs, but only a healthcare professional can interpret results in light of your complete medical history and possible additional tests.
Is the CKD-EPI formula suitable for everyone?
The CKD-EPI equation works well for most adults over 18. For children, pregnant women, or people with unusual muscle mass, alternative methods or direct measurement may be more appropriate.
What formula is used in the eGFR Calculator?
The eGFR calculator utilizes the CKD-EPI creatinine equation (2021): eGFR = 142 x min(Scr /κ, 1)^α x max(Scr /κ, 1)−1.200 x 0.9938^Age x (1.012 if female), where Scr = serum creatinine (mg/dL), κ = 0.7 (females) or 0.9 (males) and α = −0.241 (females) or −0.302 (males). This equation was developed and validated by the Chronic Kidney Disease Epidemiology Collaboration and refined in 2021 to exclude race coefficients, and is endorsed by the National Kidney Foundation and the American Society of Nephrology for the estimation of glomerular filtration rate in adults. We use this specific equation to provide trustworthy information about kidney function.