# Creatinine Clearance Calculator (Cockcroft-Gault)

URL: https://speedycalculator.com/calculators/health/creatinine-clearance/
Last updated: 2026-10-25

> The creatinine clearance calculator estimates kidney function with the Cockcroft-Gault equation from age, weight, sex and serum creatinine. It is still used to adjust many medication doses.

## Inputs

- Sex
- Age (years)
- Weight (kg, lb, g, oz, st)
- Serum creatinine (mg/dL, µmol/L)

## Results

- Creatinine clearance

## Formula

```
CrCl = (140 − age) × weight ÷ (72 × Scr) × 0.85 [female]
```

## Explanation

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

FieldWhat to enterSexChoose one: Male, FemaleAgeIn yearsWeightUnits: kg, lb, g, oz, stSerum creatinineUnits: 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)301104595608075659050
*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.*

## Worked example

Inputs — Sex: Male; Age: 60 years; Weight: 72 kg; Serum creatinine: 1 mg/dL.

Results — **Creatinine clearance = 80 mL/min**.

## FAQ

**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].


## Sources

- [Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine. Nephron, 1976](https://pubmed.ncbi.nlm.nih.gov/1244564/)