Using the GFR Calculator
The creatinine field expects milligrams per deciliter. Do not enter a value reported in micromoles per liter without converting it first. The result is indexed to a standard body surface area of 1.73 square meters, as shown in the output unit.
Worked example
Use the example inputs below to reproduce this result. These are the form's starting values, not recommended targets. Changing your inputs updates your result above; this worked example stays fixed for comparison. Results are rounded for display.
Example inputs
- Sex used by the equation
- Male
- Age (years)
- 50
- Serum creatinine (mg/dL)
- 1
Example result
- Estimated GFR (mL/min/1.73 m²)
- 91.691479
Method and assumptions
2021 CKD-EPI creatinine equation for adults. This is an estimate, not a diagnosis; a clinician should interpret it alongside other findings.
Reference: niddk.nih.gov — method and further reading
Keep the equation with the result
A clinical estimate is easier to interpret when its equation, units and input values are recorded together. Different formulas can answer related questions without producing identical values. The decimal output does not remove uncertainty in the measurements or model. A qualified clinician can interpret the result in the context of the other information this form does not collect.
Common question
Does this calculation use a race adjustment?
No. It implements the 2021 CKD-EPI creatinine equation without a race term. Other laboratory methods, including equations that use additional markers, can produce different estimates. The linked NIDDK reference explains the adult equation used here.
Guide updated .