About this calculator
eGFR estimates kidney filtration from serum creatinine, age, and sex. This calculator uses the 2021 CKD-EPI creatinine equation without a race coefficient.
Source-backed
Uses the 2021 CKD-EPI creatinine equation: 142 × min(Scr/κ,1)^α × max(Scr/κ,1)^−1.200 × 0.9938^Age × 1.012 if female.
Uses the 2021 CKD-EPI creatinine equation: 142 × min(Scr/κ,1)^α × max(Scr/κ,1)^−1.200 × 0.9938^Age × 1.012 if female.
Review status
Source-mapped educational formula
Source-mapped educational formula
Limitations
eGFR may be misleading in acute kidney injury, rapidly changing creatinine, dialysis, pregnancy, extremes of muscle mass, amputations, severe malnutrition, or unusual diets.
eGFR may be misleading in acute kidney injury, rapidly changing creatinine, dialysis, pregnancy, extremes of muscle mass, amputations, severe malnutrition, or unusual diets.
Formula and method
eGFR = 142 × min(Scr/κ,1)^α × max(Scr/κ,1)^−1.200 × 0.9938^Age × 1.012 if female, where κ and α vary by sex.
Medical safety note: This page is for education only and should not replace professional medical advice. For emergencies, medication decisions, or severe symptoms, contact a qualified clinician or local emergency service.
Limitations and when not to rely on this result
- eGFR may be misleading in acute kidney injury, rapidly changing creatinine, dialysis, pregnancy, extremes of muscle mass, amputations, severe malnutrition, or unusual diets.
- Drug dosing, contrast decisions, and kidney staging may require repeat testing, albuminuria, cystatin C, clinical context, and local guidance.
- Use clinician judgment when results conflict with the patient’s condition.
Frequently asked questions
Which eGFR equation is used? +
This tool uses the 2021 CKD-EPI creatinine equation without a race coefficient.
Can eGFR diagnose chronic kidney disease by itself? +
No. CKD usually requires abnormalities persisting at least 3 months or other kidney-damage markers such as albuminuria.
Is this valid during acute kidney injury? +
No. Creatinine-based eGFR is unreliable when serum creatinine is changing rapidly.
Is this for children? +
No. Children require pediatric equations and growth/context-specific interpretation.
Why is my lab result different? +
Labs may use different equations, rounding, standardized creatinine methods, or cystatin C-based estimates.