Creatinine Clearance Calculator

This calculator relies on the Cockcroft-Gault equation to estimate creatinine clearance (CrCl) in milliliters per minute (mL/min). The core formula adjusts for age, sex, and weight: CrCl = [(140 - Age) * Weight * Constant] / (72 * Serum Creatinine), where the constant is 0.85 for females and 1.0 for males. Depending on body mass index (BMI) and ideal body weight, the calculator automatically selects the most appropriate weight parameter—such as total body weight, ideal body weight, or adjusted body weight (ABW)—to ensure maximum accuracy for underweight or overweight individuals.

Consider a 50-year-old male patient who weighs 80 kg, stands 175 cm tall, and has a serum creatinine level of 1.2 mg/dL. First, the calculator determines his ideal body weight (IBW) as 50 + 0.9 * (175 - 152) = 70.7 kg. Next, his BMI is calculated as 80 / (1.75^2) = 26.1 kg/m^2. Using the standard Cockcroft-Gault equation for males: CrCl = [(140 - 50) * 80 * 1.0] / (72 * 1.2). This simplifies to (90 * 80) / 86.4, resulting in a estimated creatinine clearance of approximately 83.3 mL/min.

Always ensure your serum creatinine test results are up to date and measured in standard units (mg/dL) before running the calculation. When evaluating individuals with extreme body weights or severe muscle wasting, consult a medical professional to determine whether adjusted body weight or a 24-hour urine collection method provides a more reliable assessment than estimated CrCl.