CR Clearance Calculator
Cr clearance calculator works out Creatinine clearance and Weight used from Age, Sex and Body weight. The default figures on this page give creatinine clearance of 88.9 mL/min; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Serum creatinine in conventional units = 1.0000 mg/dL
- Weight used (Actual (total) body weight) = 80.00 kg
- (140 - age) = 140 - 60 = 80
- CrCl = 80 x 80.00 / (72 x 1.0000) = 88.89 mL/min
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
4 sources
What the cr clearance calculator calculates
Estimates creatinine clearance in mL/min by the Cockcroft-Gault equation, with actual, ideal or adjusted body weight and conventional or SI creatinine units.
How to use this cr clearance calculator
Enter Age, Sex, Body weight and Weight unit. Creatinine clearance updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Creatinine clearance, Weight used and Weight basis used.
The method follows Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron 1976;16(1):31-41, National Kidney Foundation / KDOQI - Cockcroft-Gault equation for estimating creatinine clearance, Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm 1974;8:650-655 - ideal body weight 50 kg (men) / 45.5 kg (women) plus 2.3 kg per inch over 5 feet and KDIGO clinical practice guideline - serum creatinine unit conversion, 1 mg/dL = 88.4 µmol/L.
60-year-old man, 80 kg, creatinine 1.0 mg/dL example
With Age: 60, Sex: male, Body weight: 80, Serum creatinine: 1, the calculator returns Creatinine clearance: 88.8888889, Serum creatinine: 1. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Creatinine clearance, Weight used and Weight basis used. The inputs you can vary are Age, Sex, Body weight, Weight unit, Serum creatinine and Creatinine unit.
Understanding Creatinine clearance, Weight used and Weight basis used
Educational estimate only. Cockcroft-Gault is an estimate of clearance, not a measurement, and renal drug dosing decisions belong to a prescriber.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do you calculate CR clearance?
Estimates creatinine clearance in mL/min by the Cockcroft-Gault equation, with actual, ideal or adjusted body weight and conventional or SI creatinine units. Open “How this is worked out” beside the result to see each step for your own figures.
What is normal creatinine clearance for age?
Estimates creatinine clearance in mL/min by the Cockcroft-Gault equation, with actual, ideal or adjusted body weight and conventional or SI creatinine units. On this page it is computed from Age, Sex and Body weight and shown as Creatinine clearance, Weight used and Weight basis used.
What is the best creatinine clearance calculator?
It needs Age, Sex, Body weight, Weight unit, Serum creatinine and Creatinine unit. Nothing else is required, and the figures stay in your browser.
How do I calculate 24-hour creatinine clearance?
The result gives Creatinine clearance, Weight used, Weight basis used, Serum creatinine, Ideal body weight (Devine) and Adjusted body weight, each labelled with its unit so the figure can be read on its own.
What information do I need for the cr clearance calculator?
You need Age, Sex, Body weight, Weight unit, Serum creatinine, Creatinine unit, Weight basis and Height (optional). The page opens with default figures that give creatinine clearance of 88.9 mL/min, so you can see the scale before entering your own.
What does this cr clearance calculator show?
It shows Creatinine clearance, Weight used, Weight basis used, Serum creatinine, Ideal body weight (Devine), Adjusted body weight, Body surface area (Mosteller) and Clearance normalised to 1.73 m^2, with the working and any warnings for your entries.