GFR Calculator: Estimate Your Kidney Function

Calculate your Glomerular Filtration Rate (GFR) with our accurate, medical-grade calculator. This essential tool helps assess your kidney function using both CKD-EPI and MDRD equations, providing valuable insights into your kidney health.

Why Calculate Your GFR?

Your GFR score is the best way to measure your kidney function and detect potential kidney disease early. Regular monitoring can help you:

  • Track your kidney health over time
  • Detect early signs of kidney dysfunction
  • Make informed decisions about your health
  • Discuss results with your healthcare provider

Enter Your Information

Enter your current age in years
Select your biological sex at birth
Select your racial background for accurate calculation
Enter your most recent creatinine lab result
Enter your height in centimeters
Enter your weight in kilograms

Understanding GFR Stages

Stage 1: Normal Kidney Function

GFR ≥ 90 mL/min/1.73m² - Kidneys are working optimally

Stage 2: Mild Kidney Damage

GFR 60-89 mL/min/1.73m² - Minor decrease in kidney function

Stage 3a: Mild to Moderate Damage

GFR 45-59 mL/min/1.73m² - Kidney function showing notable decline

Stage 3b: Moderate to Severe Damage

GFR 30-44 mL/min/1.73m² - Significant decrease in kidney function

Stage 4: Severe Kidney Damage

GFR 15-29 mL/min/1.73m² - Severe decline in kidney function

Stage 5: Kidney Failure

GFR < 15 mL/min/1.73m² - Kidneys have very little to no function

About GFR Testing

The Glomerular Filtration Rate (GFR) is considered the gold standard for assessing kidney function. Our calculator uses two widely-accepted formulas:

  • CKD-EPI Equation: The most accurate formula for most patients, recommended by kidney disease guidelines worldwide.
  • MDRD Study Equation: A well-established alternative that provides additional verification of your kidney function.