GFR Calculator

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.

Serum creatinine (SCr)
Age
Gender Male    Female
Race Black   Not Black

GFR Calculator for Children

This calculator is for people aged 18 years or younger.

Serum creatinine (SCr)
Height

Reference:

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.

The IDMS-traceable MDRD study equation
GFR = 175 × (SCr)-1.154 × (Age)-0.203 × (0.742 if female) × (1.212 if Black)

The Mayo Quadratic Formula
GFR = exp(1.911 + 5.249/SCr - 2.114/SCr2 - 0.00686 × Age - (0.205 if Female))
If SCr < 0.8 mg/dL, use 0.8 mg/dL for SCr

The CKD-EPI formula
Black Female
If serum creatinine (Scr) <= 0.7
GFR = 166 × (SCr/0.7)-0.329 × 0.993Age
If serum creatinine (Scr) > 0.7
GFR = 166 × (SCr/0.7)-1.209 × 0.993Age
Black Male
If serum creatinine (Scr) <= 0.9
GFR = 163 × (SCr/0.9)-0.411 × 0.993Age
If serum creatinine (Scr) > 0.9
GFR = 163 × (SCr/0.9)-1.209 × 0.993Age
White or other race Female
If serum creatinine (Scr) <= 0.7
GFR = 144 × (SCr/0.7)-0.329 × 0.993Age
If serum creatinine (Scr) > 0.7
GFR = 144 × (SCr/0.7)-1.209 × 0.993Age
White or other race Male
If serum creatinine (Scr) <= 0.9
GFR = 141 × (SCr/0.9)-0.411 × 0.993Age
If serum creatinine (Scr) > 0.9
GFR = 141 × (SCr/0.9)-1.209 × 0.993Age

Estimated GFR for children using Schwartz formula
GFR = 0.41 × height(in cm) / SCr
Where GFR is in the unit of (mL/min/1.73 m2), SCr is Serum Creatinine in the unit of mg/dL.
1 mg/dL = 88.4 µmol/L

Population Mean Estimated GFR

AgeMean Estimated GFR (mL/min/1.73 m2)
20-29116
30-39107
40-4999
50-5993
60-6985
70+75

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.

StageGFR Value (mL/min/1.73 m2)
Normal90+ or above and no proteinuria
CKD190+ 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 failureless than 15