eGFR Calculator: Check Your Kidney Function

A normal eGFR is 90 mL/min/1.73m² or higher. However, an eGFR between 60-89 can also be normal for some people, especially older adults, if there are no other signs of kidney damage. An eGFR below 60 for three or more months indicates chronic kidney disease.

An eGFR of 60 means your kidneys are filtering at about 60% of normal capacity. This falls in the range of Stage 2-3a CKD (mild to moderate decrease). Many people at this level feel completely normal. Your doctor may recommend monitoring and lifestyle changes to protect your kidneys.

Yes, in some cases. If kidney function decreased due to dehydration, medication effects, or an acute illness, eGFR can improve once the cause is addressed. For CKD stages 1-2, lifestyle changes (blood pressure control, diet, exercise) can sometimes improve or stabilize eGFR. At stage 3 and beyond, the goal is usually to slow progression rather than reverse it.

eGFR is an estimate, not a direct measurement. It's accurate enough for screening and monitoring but can be less accurate for people with extreme body sizes, unusual diets (very high or low protein), or muscle-wasting conditions. The CKD-EPI 2021 equation used here is the most current and recommended formula.

GFR (Glomerular Filtration Rate) is the actual speed at which your kidneys filter blood. Measuring it directly usually requires a complex hospital test. eGFR (estimated GFR) is the version you get from a simple blood test. It uses a formula to provide a very accurate reading without the need for a 24-hour test.

See your doctor if your eGFR is below 60, if it has dropped significantly from a previous test, or if you have other risk factors for kidney disease (diabetes, high blood pressure, family history). An eGFR below 30 requires closer monitoring by a kidney specialist (nephrologist). An eGFR below 15 may mean you need to discuss dialysis or transplant options.