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    GFR Calculator

    Reviewed by Medical Contributor Dinesh K. Chatoth, MD, FASN on February 29, 2024.
    Knowing your glomerular filtration rate (GFR) will help you understand how well your kidneys are functioning. Using our GFR calculator, you can find out your estimated GFR and determine which stage of chronic kidney disease (CKD) you may be in. There are specific steps you can take at every stage of CKD to help manage your health and feel your best.

    Use our GFR calculator

    To calculate your eGFR, enter all fields below.

    Gender:
    Gender:
    Based on your inputs, your EFGR value is
    0
    mL/min/1.73m

    This eGFR value may indicate:

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    Note: Your doctor measures creatinine with a simple serum blood test. You’ll need these kidney test results to complete your calculation.

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    What is GFR?

    Glomerular filtration rate is a measurement of how well your kidneys are working to clean your blood. Just as your blood pressure and cholesterol levels are important factors in knowing your risk for heart disease, your GFR is important in knowing your risk for CKD

    Your exact GFR cannot be measured directly. Instead, our GFR calculator will give you an estimate using a mathematical formula that most closely determines your kidney function based on certain personal factors and your serum creatinine, which is the amount of creatinine in your blood.

    What is estimated GFR?

    Your estimated glomerular filtration rate (eGFR) is the calculation that indicates your level of kidney function, based on the results of a creatinine serum test and other factors—such as age and gender. If your eGFR is below 90, your kidneys may not be functioning as well as they should and you may be at risk for kidney disease.

    By estimating your GFR, along with other blood and urine tests, your doctor is able to diagnose kidney disease, determine which stage you’re in, and track any progression. Knowing your eGFR is also important to managing your health at every stage of kidney disease.

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    How to calculate your GFR

    Estimating GFR begins with a simple serum creatinine blood test. If you’re using our GFR calculator, your eGFR is calculated using the results of your blood test, along with your age and gender. When your eGFR is calculated by your doctor, weight and body size may also be factored into your eGFR.

    What does your GFR mean for you?

    Your eGFR helps identify your level of kidney function. Each stage of kidney disease matches up to an eGFR range, and knowing which stage you’re in can help you identify the steps you need to take to stay your healthiest. People in early stages 1-3, for example, may want to focus on managing kidney health and slowing kidney disease progression by eating well, taking medications as prescribed, managing any comorbid conditions, and starting to see a nephrologist (kidney doctor). People in stages 4-5 of CKD should start learning about their treatment options, like kidney transplant and dialysis.

    Use the chart below to determine which CKD stage best matches your GFR calculator results and click on the stage to learn about healthy next steps.

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    STAGE 1 Kidney damage with normal kidney function eGFR of 90 or higher
    STAGE 2 Mild loss of kidney function eGFR of 60–89
    STAGE 3A Mild to moderate loss of kidney function eGFR of 45–59
    STAGE 3B Moderate to severe loss of kidney function eGFR of 30–44
    STAGE 4 Severe loss of kidney function eGFR of 15–29
    STAGE 5 - END
    STAGE RENAL
    DISEASE (ESRD)         		Kidney failure or close to kidney failure  eGFR of less than 15
    What causes CKD?
    There are many factors that can contribute to kidney disease—most commonly, diabetes and high blood pressure. Even people who’ve taken excellent care of their health can be at risk for CKD.
    Learn what causes CKD

    What are normal GFR levels?

    The GFR normal range is typically 90 or higher, though this can vary by age. Stage 1 CKD also has an eGFR range of 90 or higher because kidney damage is minimal at this stage. Therefore, additional tests may be performed by your doctor to help confirm a CKD diagnosis. Once your eGFR drops below 90, you may be at risk for more serious kidney damage. If you have any questions about whether your GFR levels are normal for you, ask your doctor for more information
    Learn about CKD tests and diagnosis

    What can affect GFR levels?

    Your eGFR tells you how well your kidneys are working, and can be affected by many factors, including your activity level, the foods you eat, and any kidney-related health conditions you have. It also varies from person to person based on age, gender, and muscle mass. To help preserve your current kidney function, talk to your care team about how you can protect your kidney health.

    If you are diagnosed with chronic kidney disease, it’s also important to understand the root cause of the condition to protect your remaining kidney function and keep your GFR levels in a healthy range. Managing other conditions like high blood pressure or diabetes can help you stay healthy and slow the progression of CKD. In some cases, your care team may recommend changing your medications or daily routine to prevent further kidney damage.

    Why knowing your GFR matters

    Your eGFR is an important calculation that helps your doctor determine your level of kidney function. This can mean something different for everybody, since your eGFR also depends on your age, gender, muscle mass, and creatinine serum test results. If your doctor is using eGFR to help diagnose kidney disease or determine your stage, you may also need additional tests to confirm.

    Knowing your eGFR and understanding which stage you’re in can help you take steps to preserve kidney function and track any progression.

    Take steps to stay your healthiest
    Looking after your health by eating well, managing other health conditions, and following your doctor's instructions can help you feel your best—and slow the progression of CKD.

    Ask your doctor how to manage your kidney health.