by Creative Labs Medical Calculators
Calculate glomerular filtration rate using the 2021 CKD-EPI creatinine equation. Recommended by ASN and NKF for accurate kidney function assessment.
Enter patient information to calculate estimated glomerular filtration rate (eGFR) using the 2021 CKD-EPI equation.
1. Select patient sex (male or female)
2. Enter age in years (18-120)
3. Enter serum creatinine value and select units
4. Black race is optional for comparison purposes only
5. Click "Calculate GFR" for results
Complete the calculator to receive personalized medical advice based on your GFR result.
The 2021 CKD-EPI creatinine equation is now the recommended standard for estimating glomerular filtration rate (GFR). This version eliminates race as a variable, addressing health equity concerns in kidney disease diagnosis and management.
The 2021 equation estimates a lower GFR for Black patients and a higher GFR for non-Black patients compared to previous equations using the same creatinine value. This calculator is for clinical decision support only and should not replace professional medical advice.
The CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) equation is a formula used to estimate glomerular filtration rate (GFR) from serum creatinine levels. The 2021 version is the current standard and does not include race as a variable.
Race was removed to address health equity concerns and because it is a social construct rather than a biological variable. The 2021 equation provides more equitable GFR estimates across all racial groups.
Cystatin C testing can add accuracy when creatinine-based estimates are unreliable (e.g., in patients with extreme muscle mass, amputations, or specific diets). However, creatinine-based equations are adequate for most clinical purposes.
CKD is classified into 5 stages based on GFR: Stage 1 (≥90 mL/min) - kidney damage with normal function; Stage 2 (60-89) - mild reduction; Stage 3 (30-59) - moderate reduction; Stage 4 (15-29) - severe reduction; Stage 5 (<15) - kidney failure.
This calculator is designed for adults (18+) with stable kidney function. It may not be accurate for pregnant women, hospitalized patients, or those with rapidly changing kidney function. Always consult a healthcare provider for medical decisions.
This calculator is based on peer-reviewed scientific literature and clinical guidelines:
For more information about kidney health and CKD management:
Equation Used: 2021 CKD-EPI creatinine equation (race-free)
Variables: Sex, age, serum creatinine
Units: GFR expressed in mL/min/1.73m²
Limitations: This equation estimates GFR in adults with stable kidney function. It may be less accurate in:
Last Updated: Based on literature current through December 2024
Creative Labs Medical Calculators. CKD-EPI GFR Calculator. Retrieved from https://tools4u.click/ckd-epi-gfr-calculator/
When using this calculator for research or clinical purposes, please also cite the original 2021 CKD-EPI publication.