GFR Calculator

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The GFR Calculator tool provides an approximate GFR value, but it is important to consult a doctor for exact results.

What is GFR?


Glomerular filtration rate (GFR) is a value used to measure how well the kidneys are working. GFR refers to the rate at which the kidneys filter blood plasma in one minute and is usually calculated in millilitres of body weight.

GFR Formul?


GFR is usually estimated by measuring the levels of waste substances such as creatinine in the blood. Some formulae provide an approximate GFR value using a range of information including factors such as creatinine level, age, gender and race.

For an accurate assessment of GFR, it is important to see your doctor and have a blood test. However, some formulae, such as the CKD-EPI formula, can be used to approximate your GFR. The CKD-EPI formula is as follows:

GFR = 141 \times \min(\text{Scr} / \text{k}, 1)^a \times \max(\text{Scr} / \text{k}, 1)^{-1.209} \times 0.993^{\text{age}} \times \text{0.813 (if female)}

In this formula

  • Scr represents the serum creatinine level in mg/dL.
  • k is 0.7 (in women) and 0.9 (in men).
  • a is -0.329 (in women) and -0.411 (in men).
  • Age refers to your age in years.

This formula provides an approximate GFR value, but it is important to consult a doctor for exact results.

Where and How is GFR Used?


Glomerular filtration rate (GFR) is an important parameter used to measure how well the kidneys are working. The kidneys have the basic functions of filtering waste materials from the body and producing urine. GFR is a measure of this filtration process and has an important role in assessing kidney function.

The areas of use of GFR are as follows:

  1. Evaluation of Kidney Diseases: GFR is one of the most important parameters in the evaluation of renal function. It is especially used to monitor renal function in conditions such as chronic kidney disease (CKD). GFR usually decreases as CKD progresses.
  2. Adjusting Drug Dosage: Some medicines are excreted from the body by the kidneys. Drug dosage may vary in patients with low GFR in the kidneys. GFR helps doctors adjust the drug dose according to the person’s kidney function.
  3. Kidney Transplant and Other Surgical Procedures: Before and after kidney transplantation, GFR values are used to evaluate the patient’s kidney function and monitor the working capacity of the transplanted kidney. It can also be used to determine kidney function prior to other surgical procedures.
  4. Clinical Trials: GFR is an important measurement in studies of kidney function in clinical trials.


GFR is usually calculated through blood tests. Blood levels of waste substances such as creatinine and some other factors are estimated using calculation formulae.

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