Free GFR Calculator - Estimate Kidney Function
Calculate estimated GFR (eGFR) using CKD-EPI or MDRD formulas. Understand your kidney function stage.
Quick Answer
GFR (Glomerular Filtration Rate) measures kidney function. Normal GFR: 90+ mL/min/1.73m². eGFR calculated from creatinine, age, sex. CKD stages: G1 (90+), G2 (60-89), G3 (30-59), G4 (15-29), G5 (<15).
Key Facts about GFR Calculator:
- Normal GFR: 90+ mL/min/1.73m²
- Calculated from serum creatinine
- CKD-EPI formula most accurate
- Declines with age (~1 mL/min per year after 40)
- Race-neutral formulas now standard
- GFR classifies kidney disease stages
Why Use Our GFR Calculator?
Kidney function tools:
eGFR Calculator
Estimate kidney function.
Multiple Formulas
CKD-EPI and MDRD.
CKD Staging
Kidney disease classification.
Health Guidance
Understanding results.
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How to GFR Calculator in 3 Easy Steps
Calculate GFR:
Enter Labs
Creatinine value.
Add Details
Age and sex.
View Results
See eGFR and stage.
Why Use Our Calculator?
Medical-grade formulas
CKD staging
Easy to understand
Track over time
Common Use Cases for GFR Calculator
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Frequently Asked Questions
Everything you need to know about our gfr calculator
What is normal GFR?
90+ is normal. 60-89 mildly decreased. Under 60 for 3+ months = CKD.
Normal GFR is 90+ mL/min/1.73m². GFR 60-89 is mildly decreased. Under 60 for 3+ months indicates chronic kidney disease.
How is GFR calculated?
From creatinine, age, sex using CKD-EPI or MDRD formula.
eGFR uses serum creatinine, age, and sex. CKD-EPI formula is: 142 × (Scr/A)^B × 0.9938^age × (1.012 if female).
Still have questions? Try the tool yourself!
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