Calcular.tools
eGFR Calculator
Estimate your Glomerular Filtration Rate for adults or children.
Understanding Your Results
Glomerular Filtration Rate (GFR) is a measure of how well your kidneys are filtering waste from your blood. It's often estimated (eGFR) using a formula based on your serum creatinine level, age, and sex. A higher GFR generally indicates better kidney function.
Medical Disclaimer
What is a GFR Calculator?
The glomerular filtration rate (GFR) is a measure of how well your kidneys are filtering waste and excess fluid from your blood. It’s a key indicator of kidney function and overall renal health.
The GFR Calculator—also known as an eGFR calc or glomerular filtration rate calculator—helps estimate your kidney’s filtering efficiency using factors like age, sex, and serum creatinine. This tool gives a quick snapshot of your kidney performance without invasive tests, helping you and your doctor make better health decisions.
Why it matters
Your kidneys quietly do a lot of heavy lifting—removing toxins, balancing electrolytes, and controlling blood pressure. A low GFR can signal early kidney damage long before symptoms appear, making regular monitoring especially valuable for people with diabetes, hypertension, or chronic kidney disease (CKD).
By using a GFR Calculator, you can compute GFR easily and track trends over time, giving you an early warning system for kidney health.
The calculator estimates your estimated glomerular filtration rate (eGFR) based on the CKD-EPI or MDRD equation. It uses your serum creatinine level (a waste product in your blood) along with your age and sex to predict kidney function.
| eGFR (mL/min/1.73 m²) | Kidney Function Category |
|---|---|
| ≥ 90 | Normal kidney function |
| 60–89 | Mild decrease |
| 30–59 | Moderate decrease |
| 15–29 | Severe decrease |
| < 15 | Kidney failure (end-stage) |
For example, if your serum creatinine is higher than normal, your GFR will likely be lower—indicating your kidneys are filtering less efficiently. The calculator’s result helps medical professionals interpret where you stand on the CKD spectrum.