What Is a Good eGFR Level by Age? Normal Ranges Chart
If you recently looked at a kidney blood test, you probably spotted a number labeled eGFR and wondered whether it is "good." The short answer: in most adults, an eGFR of 90 mL/min/1.73 m² or higher is considered a normal, healthy kidney function. But there is an important catch — what counts as a good eGFR changes with age. A value that would be concerning in a 30-year-old can be perfectly normal at 80.
This guide breaks down normal eGFR ranges by age, what the number means, and how to read your result with confidence. You can check your own value with our free eGFR calculator using the creatinine, age, and sex from your lab report.
What does eGFR measure?
eGFR stands for estimated glomerular filtration rate. It estimates how well your kidneys filter waste and extra fluid from your blood each minute, adjusted for body surface area. Doctors use it as the single best overall indicator of kidney function, and it is the backbone of chronic kidney disease (CKD) screening.
eGFR is estimated (the "e") from your serum creatinine, age, and sex using the current CKD-EPI 2021 equation. Because muscle mass, age, and sex all affect creatinine, the same creatinine value can produce a different eGFR in different people.
What is considered a "good" eGFR?
| eGFR (mL/min/1.73 m²) | CKD stage | What it usually means |
|---|---|---|
| 90 or higher | G1 | Normal or high kidney function |
| 60–89 | G2 | Mildly decreased (often normal with aging) |
| 45–59 | G3a | Mild to moderate decrease |
| 30–44 | G3b | Moderate to severe decrease |
| 15–29 | G4 | Severely decreased |
| Below 15 | G5 | Kidney failure |
A "good" eGFR is generally 60 or higher, especially in younger and middle-aged adults. However, eGFR naturally declines as we get older, so the interpretation always depends on age.
Normal eGFR range by age
Kidney function slowly declines over a lifetime — roughly 1 mL/min/1.73 m² per year after age 40 in healthy aging. That means the "normal" eGFR for a 75-year-old is naturally lower than for a 25-year-old. The table below shows typical average eGFR values by age group in healthy adults. These are averages, not strict cutoffs — individual variation is large.
| Age range | Typical average eGFR | Notes |
|---|---|---|
| 20–29 | 110–120 | Peak kidney function |
| 30–39 | 100–110 | Still excellent |
| 40–49 | 95–105 | Gradual decline begins |
| 50–59 | 85–100 | Mild drop is common |
| 60–69 | 75–95 | Lower end often normal |
| 70–79 | 60–80 | Values near 60 can be age-appropriate |
| 80+ | 50–70 | A modestly low eGFR may be normal |
Key point: An eGFR of 55 in a healthy 80-year-old is often age-appropriate and not kidney disease. The same value at age 35 would warrant investigation.
Does a good eGFR differ for men and women?
Yes, slightly. The CKD-EPI 2021 equation includes a sex coefficient because women generally have a bit less muscle mass and therefore lower creatinine production. For the same creatinine level, women typically show a slightly different eGFR than men. This is built into every modern calculator, so you do not need to adjust anything yourself — just enter your correct sex. Read more in our article on eGFR normal range for women vs men.
When is a lower eGFR not normal?
A falling or low eGFR is more meaningful when:
- It drops below 60 in a younger adult (under 60 years old).
- It declines rapidly over weeks or months.
- It comes with protein in the urine (albuminuria), abnormal imaging, or rising creatinine.
- You have risk factors like diabetes, high blood pressure, or a family history of kidney disease.
Many temporary factors can also push eGFR down without true kidney damage — dehydration, a very high-protein meal, intense exercise, or certain medications. See our guide to low eGFR causes beyond kidney disease before drawing conclusions from a single test.
How to check and track your eGFR
- Get a serum creatinine blood test from your lab.
- Enter creatinine, age, and sex into our eGFR calculator.
- Note the CKD stage and compare it to the age-based ranges above.
- Track trends over time — a single value is far less useful than the direction of change.
CKD is only diagnosed when abnormalities persist for more than three months, so one slightly low result is rarely the whole story.
Frequently asked questions
Is an eGFR of 60 bad? Not necessarily. eGFR 60–89 is stage G2 (mildly decreased). In older adults it is often normal aging. It only signals CKD if there is also evidence of kidney damage (such as protein in the urine).
What eGFR is considered kidney failure? An eGFR below 15 (stage G5) indicates kidney failure, where dialysis or a transplant may be needed.
Can eGFR improve? Sometimes — especially if a low value was caused by dehydration, a medication, or an acute issue that is reversed. Chronic CKD from diabetes or hypertension usually does not reverse, but progression can be slowed. See can you improve eGFR?.
The bottom line
A good eGFR is 90 or higher, but 60 or above is generally acceptable, and lower values can be normal in older adults. Always read your eGFR in context of your age, sex, urine tests, and overall health — never from a single number alone. When in doubt, discuss your result with a healthcare provider, and use our free online eGFR calculator to estimate and track your kidney function over time.
This article is for educational purposes only and is not medical advice. Always consult a qualified healthcare professional for diagnosis and treatment.