Cockcroft-Gault estimates creatinine clearance in mL/min, not indexed to body surface area, which is why drug labels often use it.
How to use the Creatinine Clearance Calculator
- Sex
- Age
- Weight
- Serum creatinine
Results update as you type, and every field accepts the units shown in its menu.
How it works
Weight in kg, age in years and creatinine in mg/dL go into the formula; women’s results are multiplied by 0.85.
Inputs explained
| Field | What to enter |
|---|---|
| Sex | Choose one: Male, Female |
| Age | In years |
| Weight | Units: kg, lb, g, oz, st |
| Serum creatinine | Units: mg/dL, µmol/L |
Example values
How the main result changes when Age changes and everything else stays at the example values above:
| Age (years) | Creatinine clearance (mL/min) |
|---|---|
| 30 | 110 |
| 45 | 95 |
| 60 | 80 |
| 75 | 65 |
| 90 | 50 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
CrCl = (140 − age) × weight ÷ (72 × Scr) × 0.85 [female]Worked example
Inputs — Sex: Male; Age: 60 years; Weight: 72 kg; Serum creatinine: 1 mg/dL.
Results — Creatinine clearance = 80 mL/min.
Frequently asked questions
Which weight should I use?
Practice varies; ideal or adjusted body weight is often used in obesity.
How does it differ from eGFR?
eGFR is indexed to 1.73 m² and uses newer equations; CrCl is in absolute mL/min.
What formula does the Creatinine Clearance Calculator use?
CrCl = (140 − age) × weight ÷ (72 × Scr) × 0.85 [female].