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Check your kidney health instantly with our free online Kidney Function Calculator. Calculate eGFR using creatinine, age & gender. Fast & accurate results.
Your kidneys play a vital role in filtering waste and maintaining the balance of fluids in your body. One of the most important indicators of kidney health is the Glomerular Filtration Rate (GFR). If you're wondering how to calculate GFR from creatinine, or what your kidney function level means, you're in the right place. Our Kidney Function Calculator uses the widely trusted CKD-EPI formula to help you understand your eGFR (estimated GFR) quickly and accurately.
This simple tool is designed for everyone from patients monitoring their kidney health to healthcare providers looking for a fast and accurate calculation. Let's explore how it works, why it matters, and what the results mean for you.
GFR (Glomerular Filtration Rate) is a measure of how well your kidneys are filtering blood. It's usually estimated using blood creatinine levels, age, sex, and sometimes race. The higher your GFR, the better your kidneys are working.
eGFR stands for estimated Glomerular Filtration Rate. It gives you a number that reflects how efficiently your kidneys are filtering. It’s not measured directly but calculated using a formula, commonly the CKD-EPI equation.
The CKD-EPI formula for estimating GFR is:
For females:
If serum creatinine (Scr) ≤ 0.7 mg/dL:
eGFR = 144 × (Scr / 0.7)^-0.329 × (0.993)^Age
If Scr > 0.7 mg/dL:
eGFR = 144 × (Scr / 0.7)^-1.209 × (0.993)^Age
For males:
If Scr ≤ 0.9 mg/dL:
eGFR = 141 × (Scr / 0.9)^-0.411 × (0.993)^Age
If Scr > 0.9 mg/dL:
eGFR = 141 × (Scr / 0.9)^-1.209 × (0.993)^Age
Using our online eGFR calculator is simple and free. Just enter the following:
Click on the "Calculate GFR" button and get instant results, showing your kidney function level by age and stage.
Here’s a quick overview of eGFR stages and what they mean:
| eGFR Range (mL/min/1.73m²) | Stage | Kidney Function |
|---|---|---|
| 90 and above | Stage 1 | Normal or high |
| 60 - 89 | Stage 2 | Mild decrease |
| 45 - 59 | Stage 3a | Mild to moderate decrease |
| 30 - 44 | Stage 3b | Moderate to severe decrease |
| 15 - 29 | Stage 4 | Severe decrease |
| Less than 15 | Stage 5 (Kidney Failure) | Kidney failure (dialysis) |
While eGFR naturally decreases with age, here’s a rough idea:
| Age | Normal eGFR Range |
|---|---|
| 20–30 | 107–116 |
| 40–50 | 94–102 |
| 60–70 | 85–95 |
| 70+ | 75–85 |
So if you’re wondering, what is a bad number for kidney function?, anything below 60 may require medical attention.
Hydration helps overall kidney health, but drinking water won't significantly increase your eGFR if kidney damage is already present. However, staying hydrated may prevent further kidney stress and help improve lab results temporarily.
Our Kidney Function Calculator is a powerful, user-friendly tool to help you assess your kidney health in seconds. Whether you’re managing chronic kidney disease (CKD) or just doing a routine check, understanding your eGFR normal range is key to staying healthy. Always consult your doctor with your results for proper diagnosis and treatment plans.
Using this tool regularly can help you take control of your health, track changes over time, and catch potential problems early.
The normal eGFR range is 90 or above. Anything lower could indicate some level of kidney dysfunction.
Yes, in some cases. Improving your blood pressure, blood sugar levels, and diet can help improve kidney function.
Our calculator uses the CKD-EPI formula, which is recommended by many health organizations worldwide. It is one of the most accurate eGFR calculators available online.
Age, gender, race, muscle mass, and serum creatinine levels all affect GFR values.
If you’re at risk of kidney disease (due to diabetes, high blood pressure, etc.), it’s recommended to check it every 3–6 months or as advised by your doctor.