Creatinine Clearance Calculator

Estimate kidney filtration with the Cockcroft-Gault equation — the number behind many drug dose adjustments and renal checks.

Age

Weight

Sex

Serum creatinine

The equation
CrCl = [(140 − age) × weight(kg)] ÷ (72 × SCr mg/dL)
× 0.85 for females.

Most reliable with a stable creatinine. Acute kidney injury or extreme muscle mass skew the result.

🎯 Cockcroft-Gault

Classic equation still used for drug dosing.

💊 Two creatinine units

mg/dL or μmol/L, auto-converted.

📊 CKD stage view

Rough kidney function category.

⚠️ Dosing hint

Many antibiotics adjust below 50 mL/min.