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 the use of race when estimating GFR. The joint NKF/ASN Task Force recommends using the CKD-EPI Creatinine Equation (2021) 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. For more information about measuring your kidney health, please refer to the following resources:
For specific questions about your results or kidney health, be sure to ask your health care professional.
Serum Creatinine:
Serum Cystatin C:
Standardized Assays:
These equations are valid only with standardized creatinine and cystatin methods. To learn more, click here.
Adjust for body surface area:

Choosing "No" will calculate an indexed eGFR value, standardized to a body surface area of 1.73m2 (units: mL/min/1.73m2)

  • Assessment for CKD staging and CKD progression should generally be assessed using the indexed eGFR value.

Choosing "Yes" will bring up fields to input height and weight. A non-indexed 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 non-indexed eGFR value.
  • Exception: Using non-indexed eGFR in morbidly obese patients can result in a large overestimate of measured GFR and potential for overdosing.


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

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

Is it CKD?

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

  • GFR less than 60 ≥3 months
  • ACR ≥30 mg/g or other markers of kidney damage

Click to learn more.

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 30-300 mg/g for > 3 months indicates CKD.

Additional Information


About CKD

CKD Risk Map

Clinician Tools

Kidney Failure Risk Equation