GFR Calculator

Calculate estimated GFR using the CKD-EPI formula with weight and height inputs to assess kidney function.

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About This Tool

This GFR (Glomerular Filtration Rate) calculator uses the validated CKD-EPI formula to estimate kidney function based on serum creatinine levels, age, gender, weight, height, and race. GFR is the best overall index of kidney function, with normal values around 90-120 mL/min/1.73m². Lower values indicate reduced kidney function. The calculator provides GFR estimation along with CKD (Chronic Kidney Disease) stage classification for clinical interpretation.

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How to Use

Enter your age in years
Select your biological gender
Enter serum creatinine level in mg/dL
Enter your weight in kilograms
Enter your height in centimeters
Select your race (African American or other)
Click 'Calculate GFR' to see your estimated kidney function
Review the results including GFR value and CKD stage classification

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.

Which formula does this calculator use?

This calculator uses the CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) formula, which is currently recommended by clinical guidelines as more accurate than older formulas like MDRD.

Do I need to fast before getting my creatinine tested?

No, serum creatinine tests don't require fasting. However, avoid strenuous exercise 48 hours before the test as it can temporarily increase creatinine levels.

What do the different CKD stages mean?

CKD Stage 1: GFR ≥90 with kidney damage; Stage 2: GFR 60-89; Stage 3: GFR 30-59; Stage 4: GFR 15-29; Stage 5: GFR <15 (kidney failure).

Can this calculator be used for children?

No, the CKD-EPI formula is validated for adults aged 18 and older. Pediatric GFR estimation requires different formulas that account for body surface area.

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