Calculator Form
Enter adult patient values for Cockcroft-Gault creatinine clearance.
Example Data Table
| Case | Age | Sex | Weight | Height | SCr | Method | Estimated CRCL |
|---|---|---|---|---|---|---|---|
| Adult outpatient | 52 | Male | 78 kg | 175 cm | 1.0 mg/dL | Actual | 95.4 mL/min |
| Older female | 71 | Female | 64 kg | 162 cm | 1.3 mg/dL | Ideal | 38.6 mL/min |
| Obesity review | 60 | Male | 118 kg | 173 cm | 115 µmol/L | Adjusted | 73.8 mL/min |
Formula Used
The calculator uses the Cockcroft-Gault equation for adults. Serum creatinine values entered in µmol/L are converted to mg/dL before calculation.
Cockcroft-Gault: CRCL = ((140 − age) × weight in kg) ÷ (72 × serum creatinine in mg/dL)
Female adjustment: multiply the result by 0.85.
Ideal body weight: Male = 50 + 2.3 × inches over 5 feet. Female = 45.5 + 2.3 × inches over 5 feet.
Adjusted body weight: IBW + 0.4 × (actual weight − IBW)
BSA: √((height in cm × weight in kg) ÷ 3600)
Normalized clearance is displayed as CRCL × 1.73 ÷ BSA. Use clinical judgment before applying any dose change.
How to Use This Calculator
- Enter adult age, sex, actual weight, height, and serum creatinine.
- Choose the creatinine unit used by the laboratory report.
- Select a weight method or keep auto selection enabled.
- Add an optional note for the medication under review.
- Press Calculate CRCL to show the result above the form.
- Review supporting values such as BMI, BSA, IBW, and adjusted weight.
- Export the result to CSV or PDF when documentation is needed.
Important Notes
This tool is intended for adult creatinine clearance estimation. It does not replace direct measurement, lab review, or professional medical judgment.
Creatinine clearance and eGFR are related but not interchangeable for every dosing decision. Follow local protocols and the product label when adjusting medications.
FAQs
1. What does CRCL mean?
CRCL means creatinine clearance. It estimates how much blood the kidneys clear of creatinine each minute and helps support medication dosing reviews.
2. Which equation does this calculator use?
It uses the Cockcroft-Gault equation, a common adult method for drug dosing decisions when creatinine clearance is requested.
3. Why does the calculator ask for height?
Height helps estimate ideal body weight, adjusted body weight, lean body weight, BMI, and body surface area for a fuller renal dosing review.
4. When should adjusted body weight be considered?
Adjusted body weight is often considered in obesity when actual weight may overestimate kidney function in the Cockcroft-Gault equation.
5. Is CRCL the same as eGFR?
No. They are different estimates built for different purposes. Many drug labels specifically reference creatinine clearance rather than eGFR.
6. Can I use this for children?
No. This calculator is designed for adults. Pediatric kidney assessment usually requires age-specific equations such as Schwartz-based methods.
7. Does a low result confirm kidney disease?
No. A low estimate needs clinical interpretation, repeat testing, trend review, and correlation with symptoms, labs, and the full medical picture.