Serum Creatinine (mg/dL) Enter your serum creatinine value from your blood test report (e.g., 1.0)

Age (years) Enter your age in whole years (e.g., 40)

Sex Select sex Male Female Select your biological sex as recorded in your blood test report

Quick Examples:

Adult Male, Normal Function Older Female, Reduced Function

Calculate Clear

This calculator is a screening tool only, not a diagnostic instrument. It is not intended to replace professional medical evaluation. Consult a healthcare provider.

This tool is commonly used across India by doctors and patients to understand kidney function from routine blood test reports.

What Is Estimated Glomerular Filtration Rate

Estimated Glomerular Filtration Rate, or eGFR, is a number that shows how well your kidneys are cleaning your blood. Your kidneys work like tiny filters. They remove waste and extra fluid from your blood every minute. The eGFR number tells you if those filters are working at a normal speed. A lower number may mean the filters are slowing down. Doctors use this number to check how healthy your kidneys are over time.

How Estimated Glomerular Filtration Rate Is Calculated

Formula

This formula uses your blood test result for creatinine, your age, and your sex to estimate how fast your kidneys filter blood. Creatinine is a waste product your muscles make. If your kidneys slow down, creatinine builds up in your blood. The formula compares your creatinine level to a normal level based on your sex. It then adjusts for age because kidney function tends to drop as people get older. The math puts all these parts together to give one number that estimates your kidney filter speed.

Why Estimated Glomerular Filtration Rate Matters

Knowing your eGFR number helps you and your doctor understand how well your kidneys are working. It is a simple way to spot changes in kidney health early, before you feel any symptoms. This number is often checked during routine blood tests in India.

Why Early Kidney Screening Is Important for Long-Term Health

Kidney problems often do not cause any signs until they are very advanced. A low eGFR may indicate that kidney function has been declining for some time without anyone knowing. Finding a low number early may allow for steps that help slow further decline. Ignoring this number could mean missing a chance to protect your kidneys before lasting damage occurs.

For Older Adults

Kidney function naturally decreases with age. An eGFR that looks low for a young person may be considered normal for someone over 65. Doctors often look at the trend over time rather than a single number. A slow and steady drop is common with aging, while a sudden drop may point to a new problem that may need medical attention.

For People with Unusual Muscle Mass

The CKD-EPI formula assumes an average muscle mass. People with very low muscle mass, such as those who are frail or malnourished, may have a low creatinine level even if their kidneys are not working well. This can make the eGFR look higher than it really is. People with very high muscle mass, such as athletes, may have the opposite issue. In these cases, a doctor may consider using a different test like cystatin C for a more reliable estimate.

eGFR vs Serum Creatinine

Serum creatinine and eGFR are related but different. Serum creatinine is the raw waste level in your blood. A high number means more waste is building up. But it is hard to read on its own because what counts as high depends on your age, sex, and muscle mass. eGFR takes your creatinine and adjusts it for those factors. It gives you one clear number that is easier to understand and compare over time. A common mistake is looking only at creatinine and missing the bigger picture that eGFR provides.