GFR Calculator

Estimate glomerular filtration rate from the patient information requested by the calculator using an established eGFR equation.

GFR Calculator

The GFR Calculator estimates glomerular filtration rate, a measure used to assess how well the kidneys filter blood. The calculation depends on the equation and clinical inputs used by the tool.

How eGFR is estimated

Modern adult eGFR calculations commonly use serum creatinine together with age and sex. The 2021 CKD-EPI creatinine equation is one established approach and does not include a race coefficient.

Using the calculator

Enter the laboratory and personal values requested by the calculator exactly as reported. Check the units for creatinine before calculating because unit differences can substantially change an estimated GFR.

Important interpretation

Estimated GFR is a clinical estimate and can be affected by factors that are not fully captured by an equation. Kidney results should be interpreted with a qualified healthcare professional, especially when values are abnormal or changing.

Frequently Asked Questions FAQ

What does GFR mean?
GFR means glomerular filtration rate and describes the estimated rate at which the kidneys filter blood.
What information is commonly used to estimate GFR?
Adult eGFR equations commonly use serum creatinine, age, and sex, with the exact inputs depending on the equation.
Does eGFR measure kidney function exactly?
No. eGFR is an estimate and can be influenced by factors not fully represented in the equation.
Why do creatinine units matter?
The equation expects creatinine in a specific unit, so entering a different unit without conversion can produce a misleading result.

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