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GFR Calculator

Calculate estimated Glomerular Filtration Rate (eGFR) using CKD-EPI and MDRD formulas with age, gender, serum creatinine, and race inputs.

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About This Tool

This GFR Calculator helps estimate glomerular filtration rate, a key measure of kidney function. It implements both the CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) and MDRD (Modification of Diet in Renal Disease) equations. Users input their age, gender, serum creatinine level, and race (African American or non-African American) to get an accurate eGFR calculation. The tool also classifies results according to CKD stages (1-5) and provides interpretation of what the GFR value means for kidney health. All calculations are performed client-side with no data sent to servers.
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How to Use

  1. Enter your age in years
  2. Select your biological gender
  3. Input your serum creatinine level in mg/dL
  4. Select your race (African American or non-African American)
  5. Choose calculation method (CKD-EPI or MDRD)
  6. Click 'Calculate GFR' to see your estimated glomerular filtration rate
  7. View your CKD stage classification and interpretation
How to use gfr calculator nephron

Frequently Asked Questions

Find Quick Answers

What is GFR and why is it important?
GFR (Glomerular Filtration Rate) measures how well your kidneys filter waste from your blood. It's the best overall indicator of kidney function and helps diagnose and monitor kidney disease.
What's the difference between CKD-EPI and MDRD formulas?
CKD-EPI is generally more accurate at higher GFR levels (>60 mL/min) and is now the preferred equation. MDRD is older but still widely used. Both consider age, gender, serum creatinine, and race.
What do the CKD stages mean?
CKD stages range from 1 (normal kidney function with kidney damage) to 5 (kidney failure). Stage 1: GFR ≥90, Stage 2: 60-89, Stage 3a: 45-59, Stage 3b: 30-44, Stage 4: 15-29, Stage 5: <15.
What units should I use for serum creatinine?
This calculator uses mg/dL units. If your lab uses μmol/L, divide by 88.4 to convert to mg/dL (e.g., 100 μmol/L = 1.13 mg/dL).

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