This Glomerular filtration rate (GFR) Calculator gives out estimated GFR values based on Serum creatinine value, age, race, gender, etc. For comparison, the results based on 3 most popular formula are provided.
GFR Calculator for Adults
This calculator is for people aged 18 years or older.
GFR Calculator for Children
This calculator is for people aged 18 years or younger.
Glomerular filtration rate (GFR) is the amount of liquid filtered by the kidney glomerular capillaries into the Bowman's capsule in a certain period of time. It is a measurement of the quantity of the substance in the urine that originated from a calculable volume of blood.
GFR can be accurately measured by comparing the ingredient in the blood and urine. It can also be estimated by formulas based on blood test result. In practice, creatinine clearance based on the serum creatinine level is used to estimate GFR. Creatinine is a breakdown product of creatine phosphate, which is found in muscle.
Yet, creatinine estimates of GFR have limitations. The estimating Formulas depend on a prediction of the 24-hour creatinine excretion rate, which is a function of muscle mass. Due to the different level of muscle in the body, same serum creatinine might means different levels of rental function on different people.
The following is a list of popular GFR estimation formula.
1 mg/dL = 88.4 µmol/L
Population Mean Estimated GFR
|Age||Mean Estimated GFR (mL/min/1.73 m2)|
Chronic Kidney Disease Stages
For most people, a GFR over 60 mL/min/1.73m2 is enough. But significant decline of the GFR from a previous test result can be an early indicator of kidney disease requiring medical intervention. The sooner kidney dysfunction is diagnosed and treated the greater odds of preserving remaining nephrons, and preventing the need for dialysis.
|Stage||GFR Value (mL/min/1.73 m2)|
|Normal||90+ or above and no proteinuria|
|CKD1||90+ with evidence of kidney damage|
|CKD2 (Mild)||60 to 89 with evidence of kidney damage|
|CKD3 (Moderate)||30 to 59|
|CKD4 (Severe)||15 to 29|
|CKD5 Kidney failure||less than 15|