What is eGFR and how is it calculated?

eGFR (estimated Glomerular Filtration Rate) is a measure of kidney function that estimates how much blood passes through the glomeruli (tiny filters in the kidneys) each minute. It is calculated using equations like CKD-EPI 2021, MDRD, or Cockcroft-Gault that consider factors like age, sex, and serum creatinine levels.

Which eGFR equation should I use?

The CKD-EPI 2021 equation is currently recommended for adults as it removes race from the calculation. For elderly patients (≥70 years), consider BIS-1. For pediatric patients, use the Schwartz equation or CKiD U25. The EKFC and FAS equations work across all ages.

What is the CKD-EPI calculator?

The CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) calculator uses the CKD-EPI equations to estimate GFR. The 2021 version is race-free and recommended by KDIGO 2024 guidelines. Our calculator includes both CKD-EPI 2021 and CKD-EPI 2009 versions.

How does the MDRD calculator work?

The MDRD (Modification of Diet in Renal Disease) calculator estimates GFR using serum creatinine, age, sex, and optionally race. While largely replaced by CKD-EPI, it's still used for historical comparison. Our calculator includes MDRD with full medical references.

What is the Cockcroft-Gault equation used for?

The Cockcroft-Gault equation estimates creatinine clearance (CrCl), which is important for drug dosing. It requires age, weight, sex, and serum creatinine. Many medication guidelines reference Cockcroft-Gault values specifically for dose adjustments.

What is the EKFC calculator?

The EKFC (European Kidney Function Consortium) calculator uses a race-free equation that works across all ages. It normalizes creatinine to age-specific reference values and is particularly useful in European populations.

What is the Full Age Spectrum (FAS) calculator?

The FAS (Full Age Spectrum) equation calculates eGFR accurately from children to elderly. It uses age-specific creatinine reference values and is race-free, making it versatile for clinical use across different age groups.

What is the BIS-1 calculator for elderly patients?

The BIS-1 (Berlin Initiative Study) equation was developed specifically for patients aged 70 years and older. It provides more accurate eGFR estimates in elderly adults where standard equations may overestimate kidney function.

What are the CKiD U25 equations?

CKiD U25 (Chronic Kidney Disease in Children Under 25) equations are specifically designed for patients under 25 years. Our calculator includes creatinine-only, cystatin C-only, and combined versions for pediatric kidney function assessment.

What is a normal eGFR value?

A normal eGFR is typically 90 mL/min/1.73m² or higher. CKD stages: Stage 1 (≥90) normal function, Stage 2 (60-89) mild decrease, Stage 3a (45-59) mild-moderate, Stage 3b (30-44) moderate-severe, Stage 4 (15-29) severe, Stage 5 (<15) kidney failure.

Can I use this calculator for pediatric patients?

Yes! Our calculator includes pediatric equations: Schwartz (bedside) for children, CKiD U25 equations for patients under 25, and Neonatal eGFR for infants. The calculator automatically recommends appropriate equations based on patient age.

eGFR Calculator | CKD-EPI, MDRD, Cockcroft-Gault, EKFC & More

eGFR Calculator

Free Online GFR Calculator with CKD-EPI, MDRD, EKFC & 17+ Equations

Calculate estimated Glomerular Filtration Rate instantly using CKD-EPI 2021, CKD-EPI 2009, MDRD, Cockcroft-Gault, EKFC, FAS (Full Age Spectrum), BIS-1, Schwartz, CKiD U25 & more. Includes CKD staging, medical references, and KDIGO 2024 guidelines.

17+ Validated EquationsCKD Staging CalculatorMedical ReferencesFree for Healthcare Professionals

The estimated Glomerular Filtration Rate (eGFR) is the standard method for assessing kidney function in clinical practice. Our free eGFR calculator measures how effectively your kidneys filter waste products from your blood, expressed in milliliters per minute per 1.73 square meters of body surface area (mL/min/1.73m²). Healthcare professionals worldwide rely on GFR calculation to diagnose chronic kidney disease (CKD), determine CKD staging, monitor disease progression, adjust medication dosages, and make critical treatment decisions.

This online GFR calculator supports 17+ validated equations including: CKD-EPI 2021 (recommended by KDIGO 2024 guidelines), CKD-EPI 2009, MDRD (Modification of Diet in Renal Disease), Cockcroft-Gault for creatinine clearance, EKFC (European Kidney Function Consortium), FAS (Full Age Spectrum), BIS-1 for elderly patients, and pediatric equations like Schwartz, CKiD U25, and Neonatal eGFR. Each equation includes medical references, clinical explanations, and validation context to help healthcare professionals make informed decisions.

eGFR Calculator

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eGFR Calculator: Understanding Estimated Glomerular Filtration Rate

CKD Staging Calculator: eGFR Values and Kidney Disease Stages

Supported eGFR Equations: CKD-EPI, MDRD, EKFC, FAS & More

Adult eGFR Equations

Pediatric GFR Equations

Frequently Asked Questions About eGFR