Actual body weight
— mL/minMatches the weight input used in the original equation.
Renal function · Adult
Creatinine Clearance
Estimates creatinine clearance using the Cockcroft–Gault equation. Compare actual, ideal, and adjusted body-weight inputs without hiding the method.
Evidence recordSources and method currentVersion 0.2 · Updated July 17, 2026
Step 1
Enter patient values
Private by design. Values are calculated on this device and are not saved or sent to analytics.
Step 2
Compare results
Ideal body weight (Devine)
— mL/minShown for comparison; requires height of at least 5 ft.
Adjusted body weight (0.4)
— mL/minAdjBW = IBW + 0.4 × (actual − ideal).
No automatic “recommended weight.”Weight selection is context- and medication-specific. Verify the renal-function method and weight convention in the current prescribing information or institutional protocol before dosing.
Evidence packet
What this tool is based on
This versioned record keeps the citations, equation or decision rule, units, test coverage, intended population, and exclusions attached to the tool.
How evidence review works →Primary equation · Primary publicationCockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine.Nephron. 1976;16(1):31–41. PMID: 1244564 ↗Regulatory context · GuidanceFDA guidance: Pharmacokinetics in patients with impaired renal function.U.S. Food and Drug Administration. ↗Drug-dosing context · GuidanceNIDDK: Determining drug dosing in adults with chronic kidney disease.National Institute of Diabetes and Digestive and Kidney Diseases. ↗Weight-method comparison · Validation studyWinter et al. Impact of various body weights and serum creatinine concentrations on Cockcroft–Gault.Pharmacotherapy. 2012;32(7):604–612. PMID: 22576791 ↗
Intended population
Adults with stable serum creatinine when Cockcroft–Gault is the renal estimate required by the dosing evidence.
Equation record
Cockcroft–Gault (1976), with actual, Devine ideal, and adjusted body weight 0.4 shown separately.
Unit handling
Weight accepts kg or lb; height accepts cm or in; serum creatinine accepts mg/dL or µmol/L. Calculations normalize to kg, cm, and mg/dL.
Test coverage
Reference cases, coefficient handling, unit equivalence, body-weight methods, and invalid-input behavior.
Do not skip
Limitations and exclusions
- Not validated here for patients younger than 18 years.
- Unreliable in acute or rapidly changing kidney function.
- Not a substitute for measured creatinine clearance when measurement is clinically necessary.
- Use caution in pregnancy, dialysis, severe muscle-mass extremes, amputation, cachexia, or unusual body size.
- The 0.85 female coefficient is historical and does not represent contemporary gender identity.
- Low serum creatinine values are not rounded automatically.
One clearly labeled, contextually relevant sponsor may support this reference area. Sponsorship will never interrupt inputs, obscure results, influence formulas, or imply clinical endorsement.
About this tool
Creatinine Clearance (CrCl) Calculator
Use this CrCl calculator to estimate adult creatinine clearance with the Cockcroft–Gault equation. It places actual, ideal, and adjusted body-weight results side by side so the weight assumption stays visible.
The page shows the equation, converted inputs, BMI, and each weight used. It does not select a dosing weight or replace current labeling, institutional policy, or clinical judgment.