eGFR Calculator

Glomerular filtration rate (GFR) is the best overall index of kidney function. Normal GFR varies according to age, sex, and body size, and declines with age.

The National Kidney Foundation (NKF) and the American Society of Nephrology (ASN) convened a Task Force in 2021 to focus on eliminating the use of race when estimating GFR. The joint NKF/ASN Task Force recommends using the race-free CKD-EPI equations to estimate GFR. More information regarding this recommendation may be found in this article highlighting the Task Force’s recommendations.

This eGFR Calculator is intended for use only by health care professionals. If you are a patient interested in learning more about your kidney health, please check out the following resources and refer specific questions to your healthcare provider.

This calculator estimates GFR using serum creatinine and/or cystatin C; both biomarkers are not required. The results displayed will depend on which value(s) you enter.

For persons under 18 years of age, use the pediatric eGFR calculator.

Serum Creatinine:
Serum Cystatin C:
Age:
Sex:
Standardized Assays:
These equations are valid only with standardized creatinine and cystatin methods.
Adjust eGFR for body surface area (for medication-related decision making, using Dubois Method):

Choosing "No" will calculate an eGFR value standardized to a body surface area (BSA) of 1.73m2 (units: mL/min/1.73m2), i.e. standardized eGFR (also known as indexed eGFR)

  • CKD staging and CKD progression should generally be assessed using the standardized (indexed) eGFR value.

Choosing "Yes" will bring up fields to input height and weight. A BSA-adjusted eGFR value (i.e. adjusted for the patient's body surface area) will be calculated (units: mL/min).

  • Drug dosing decisions should generally be based on the BSA-adjusted eGFR value (units: mL/min).
Height:
Weight:

Results

 
CKD-EPI creatinine equation (2021)
CKD-EPI creatinine-cystatin equation (2021)
CKD-EPI cystatin C equation (2012)

Is it CKD?

Either of the following must be present for ≥3 months to be CKD:

  • eGFR less than 60
  • uACR ≥30 mg/g or other markers of kidney damage

Learn more about the criteria for CKD.

Equation used to estimate GFR?




What is the patient’s ACR?†

Based on the information supplied:

GFR category is:‡   see note below
ACR category is:**
CKD classification is:
Risk of progression is:
Frequency of monitoring should be:
Referral to a nephrologist is:

In the absence of evidence of kidney damage, neither GFR category G1 nor G2 fulfill the criteria for CKD.

† Neither the category of GFR nor the category of albuminuria alone can fully capture prognosis of CKD. Persistent and increased albuminuria has been shown to be an independent risk factor for CKD progression.

‡ In the absence of evidence of kidney damage, neither GFR category G1 nor G2 fulfill the criteria for CKD.

** ACR >30 mg/g for ≥3 months indicates CKD.