Cockcroft & Gault Online Calculator

The Cockcroft & Gault formula is an equation used to estimate glomerular filtration rate (GFR), which is an indicator of kidney function. Below we share a free online Cockcroft & Gault 100% calculator with no form to fill.

To use the Cockcroft & Gault calculator, you will need the patient's age, gender, weight, and serum creatinine information. This information can usually be obtained through clinical and blood tests performed by a healthcare professional.

The glomerular filtration rate is mL/min.


Interpreting the Result of the Cockcroft & Gault Calculation

The conclusion of the Cockcroft & Gault calculator result can be interpreted in different ways, depending on the clinical context and additional information available about the patient.

Below is a list of glomerular filtration rate (GFR) ranges according to the National Kidney Foundation (NKF):

  • GFR greater than or equal to 90 mL/min/1.73m²: normal renal function
  • GFR between 60 and 89 mL/min/1.73m²: slight decrease in renal function
  • GFR between 45 and 59 mL/min/1.73m²: moderate decrease in renal function
  • GFR between 30 and 44 mL/min/1.73m²: severe decrease in kidney function
  • GFR between 15 and 29 mL/min/1.73m²: advanced renal failure
  • GFR less than 15 mL/min/1.73 m²: end-stage renal failure

GFR is a measure of kidney function and is usually expressed in mL/min. A low GFR can indicate reduced kidney function and the need for medical treatment. On the other hand, a high GFR can indicate normal or increased kidney function.


About TFG

Glomerular filtration rate (GFR) is an important indicator of kidney function, which reflects the ability of the kidneys to filter blood and remove waste and excess from the body.

GFR is an indicator of kidney health and can be affected by several conditions, such as diabetes, high blood pressure, kidney infections, among others.

To help estimate GFR, the Cockcroft & Gault formula is an equation used to calculate GFR based on age, gender, weight, and serum creatinine.


How does the Cockcroft & Gault formula work?

The Cockcroft & Gault formula is an equation used to estimate GFR based on age, sex, weight, and serum creatinine. Creatinine is a waste product of muscle metabolism that is eliminated by the kidneys. GFR is a measure of the filtration rate of the kidneys and is calculated based on serum creatinine.

The Cockcroft & Gault formula is as follows:

(GFR in mL/min) = ((140 – age) * weight * constant) / (72 * creatinine)


  • age: is the patient's age in years.
  • weight: is the patient's weight in kilograms.
  • creatinine: is the patient's serum creatinine in milligrams per deciliter (mg/dL).
  • constant: it is a constant that varies according to the gender of the patient. For men, the constant is 1.0. For women, the constant is 0.85.

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