GFR Calculator

Gentian GFR Calculator v2.1

This tool calculates relative GFR from your Gentian Cystatin C value and absolute GFR using three parameters: Relative GFR, height and weight.

The calculation of the Absolute GFR below is based on the Du Bois and Du Bois1) formula for body surface estimation.

To calculate relative GFR, insert cystatin c value and click the 'Relative GFR' button.

To calculate absolute GFR, insert relative GFR (or calculate from cystatin c value). Insert height and weight and click the 'Absolute GFR' button.

Cystatin C value

Relative GFR

mL · min-1 ·(1.73 m2)-1

To calculate Absolute GFR, complete the form:

Height [cm]

Weight [kg]

Body surface area:


Absolute GFR

1) DuBois D and DuBois EF. A formula to estimate the approximate surface area if height and weight are known. Arch Intern Medicine. 1916; 17:863-871.