GFR Calculator
Calculate your estimated Glomerular Filtration Rate (eGFR) to assess kidney function for adults and children using clinically validated formulas.
Kidney Function Assessment
Enter patient information to calculate estimated GFR and CKD stage
Normal range: 0.6-1.2 mg/dL (varies by lab)
eGFR Result
Enter patient information to calculate eGFR.
Understanding GFR & CKD Stages
CKD Stages
G1: ≥90Normal
G2: 60-89Mildly decreased
G3a: 45-59Mild-moderate
G3b: 30-44Moderate-severe
G4: 15-29Severe
G5: <15Kidney failure
Formula Comparison
CKD-EPI 2021:
Most current, race-free formula recommended by guidelines
MDRD:
Traditional formula, may underestimate at higher GFR levels
Schwartz Formula:
Pediatric formula for children aged 0-17 years
Clinical Significance
- Normal GFR: 90-120 mL/min/1.73 m² in healthy adults
- CKD diagnosis: GFR <60 for ≥3 months
- Referral to nephrology: Usually at GFR <30
- Dialysis consideration: GFR <15 or symptomatic
Limitations
- Less accurate in extremes of age, body size, or muscle mass
- May be inaccurate in acute kidney injury
- Requires stable creatinine levels
- Consider cystatin C-based equations for better accuracy