Creatinine clearance calculator
Enter age, sex, weight, and a serum creatinine value in mg/dL or µmol/L to see the creatinine clearance the 1976 Cockcroft and Gault equation returns, with the ideal-weight and adjusted-weight variants when you give a height.
Medically reviewed by Kevin Brandstetter, M.D.Updated September 23, 2026
Temi's tools are written for adults.
The creatinine value on a blood test report, in the unit the report uses.
Optional. Adds the clearance on ideal and adjusted body weight when your weight is above the Devine ideal body weight for your height.
Estimated creatinine clearance
Enter sex, age, weight, and creatinine
The estimate appears here once each is filled in. Height is optional.
Cockcroft and Gault published this equation using actual body weight. Dosing references differ on which weight to use, and a clinician picks the one that fits the medication and the patient.
This is an estimate from one lab value. A clinician reads it alongside the rest of your record.
A calculator, not a diagnosis.
This tool is for adults: estimates for children use different equations entirely. The equation estimates kidney filtration from a single creatinine value, and creatinine varies with muscle mass, diet, pregnancy, amputation, acute illness, and some medications, so a single value on a single day is not a measurement of filtration.
Methodology
- How this is calculated
- Creatinine clearance in mL/min is 140 minus age in years, times weight in kilograms, divided by 72 times serum creatinine in mg/dL, and multiplied by 0.85 for the female equation. A creatinine entered in µmol/L is converted to mg/dL first, using creatinine's molar mass (about 88.4 µmol/L per mg/dL). The headline uses the actual weight entered. When a height of five feet or more is given and the actual weight is above the Devine ideal body weight for that height, the same equation also runs on the Devine weight and on adjusted body weight, the Devine weight plus 0.4 times the weight above it. Each clearance is rounded to a whole number.
- Where the data comes from
- Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron. 1976;16(1):31-41. The paper's abstract gives the equation for adult men and states the value for women as 15 percent less, which is the 0.85 factor: a fixed correction stated beside the equation, not a separate equation fitted to women. Ideal body weight follows McCarron MM, Devine BJ. Clinical pharmacy: case studies. Case number 25: gentamicin therapy. Drug Intell Clin Pharm. 1974;8(11):650-655, and the 0.4 factor for adjusted body weight traces to Bauer LA, Edwards WA, Dellinger EP, Simonowitz DA. Influence of weight on aminoglycoside pharmacokinetics in normal weight and morbidly obese patients. Eur J Clin Pharmacol. 1983;24(5):643-647.
- Last updated
- September 23, 2026
- What this does not account for
- People under 18. Muscle mass, diet, pregnancy, amputation, acute illness, and medications that change creatinine without changing filtration. Heights below five feet, where Devine published no equation and this tool shows only the actual-weight figure. Which weight a given medication's dosing reference calls for.
What creatinine clearance is
Creatinine is a waste product of muscle that the kidneys filter out of the blood. Creatinine clearance is the volume of blood cleared of creatinine each minute. Measuring it takes a timed urine collection, so in 1976 Cockcroft and Gault published an equation that estimates it from one blood creatinine value, age, weight, and sex. Many medication references still state their kidney limits in these terms.
Which weight the equation uses
Cockcroft and Gault published the equation using actual body weight, and that is the headline figure here. Some dosing references use the Devine ideal body weight or adjusted body weight instead, particularly when actual weight is well above the Devine weight. When you give a height, this tool shows all three, each with the weight it used, and leaves the choice to a clinician.
Creatinine clearance and eGFR
The two numbers answer different questions. Creatinine clearance is in mL/min for one person of a given weight. The eGFR calculator gives a filtration rate normalized to a standard body-surface area of 1.73 m², from an equation that takes no weight at all.
Nothing here is stored
Your answers stay in your browser. They are not sent to Temi, not saved, not attached to you, and not recorded in any session replay, and closing the tab clears them. Temi knows only that someone opened this tool, the same thing it knows about every page.
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