What the tool does, how to run it, and what to expect from the result.
Cockcroft-Gault (1976): CrCl = (140 − age) × weight kg ÷ (72 × serum creatinine mg/dL), multiplied by 0.85 for women. A 60-year-old man weighing 72 kg with creatinine 1.0 gets (80 × 72) ÷ 72 = 80 mL/min. It is still the standard for adjusting drug doses; labs report eGFR (CKD-EPI) for staging kidney disease.
A quick way to understand who this helps, what it solves, and where it connects next.
Anyone tracking fitness or health numbers, plus students and clinicians double-checking a formula.
Using the creatinine clearance calculator without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
No. Both estimate kidney filtration, but eGFR (CKD-EPI 2021) is normalized to 1.73 m² of body surface and used for staging, while Cockcroft-Gault gives mL/min for the actual patient and is used in drug labels.
The original used actual weight. For obese patients many pharmacists use adjusted body weight instead, which our Adjusted Body Weight Calculator gives.
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Enter your numbers and the result updates live in your browser. Nothing is uploaded and no server is used.
Calculations run locally in your browser. An estimate for general guidance, not medical advice.