# Creatinine Clearance Calculator (Cockcroft-Gault)

Estimate creatinine clearance (CrCl) with the Cockcroft-Gault equation: CrCl (mL/min) = [(140 − Age) × Weight(kg)] / [72 × SCr(mg/dL)] × 0.85 if female. Choose the weight basis: Actual Body Weight (ABW), Ideal Body Weight (IBW, Devine 1974), or Adjusted Body Weight (AdjBW = IBW + 0.4 × (ABW − IBW), for obese patients). Optional SCr floor at 1.0 mg/dL for elderly / low-muscle-mass patients. Returns an UN-indexed CrCl in mL/min — the value drug-dosing tables use (for BSA-indexed eGFR use MDRD or CKD-EPI). Derived from Cockcroft & Gault, Nephron 1976. Valid for stable renal function in adults. Not medical advice.

> Canonical page: https://elysiatools.com/en/tools/creatinine-clearance-cockcroft

- **Category:** Health

- **Keywords:** creatinine clearance, CrCl, Cockcroft-Gault, renal function, kidney, IBW, ideal body weight, Devine, adjusted body weight, drug dosing, serum creatinine, nephrology, pharmacokinetics

## Overview

Estimate unindexed creatinine clearance (CrCl) in mL/min with the Cockcroft-Gault equation for adults with stable renal function. Enter age, sex, actual body weight, serum creatinine, and select ABW, IBW, or AdjBW as the weight basis.

## Inputs

- **Age (years)** (number): Patient age in years. Must be ≥18 and ≤120.
- **Sex** (select)
- **Actual Body Weight (kg)** (number): Actual body weight in kg. Must be positive.
- **Height (cm, required for IBW/AdjBW)** (number): Height in cm. Required when weight basis is IBW or AdjBW.
- **Serum Creatinine (mg/dL)** (number): Serum creatinine in mg/dL. Must be positive.
- **Weight basis** (select)
- **Floor SCr at 1.0 mg/dL (elderly/low muscle mass)** (checkbox): If checked and SCr < 1.0 mg/dL, use 1.0 mg/dL (convention to avoid overestimating CrCl in elderly/low-muscle-mass patients).
- **Decimal Places** (number)

## When to use

- Estimate creatinine clearance for reviewing renal function in adults with stable kidney function.
- Generate the unindexed CrCl value used by many drug-dosing tables.
- Compare results using actual, ideal, or adjusted body weight when the selected weight basis matters.

## How it works

- Enter the patient’s age, actual body weight, serum creatinine, and optional height when using IBW or AdjBW.
- Select sex and a weight basis: ABW, IBW, or AdjBW.
- Optionally floor serum creatinine at 1.0 mg/dL for elderly or low-muscle-mass patients.
- The calculator applies Cockcroft-Gault and returns CrCl in mL/min with the selected decimal precision.

## Use cases

- Reviewing renal function estimates for medication dose assessment.
- Calculating CrCl with IBW or AdjBW when actual body weight may not be the chosen basis.
- Documenting reproducible Cockcroft-Gault calculations with the inputs and weight basis used.

## Frequently asked questions

### What equation does this calculator use?

It uses the Cockcroft-Gault equation: CrCl = [(140 − age) × weight] / [72 × serum creatinine], multiplied by 0.85 for females.

### What weight options are available?

You can select Actual Body Weight, Ideal Body Weight using the Devine formula, or Adjusted Body Weight.

### When is height required?

Height is required when using Ideal Body Weight or Adjusted Body Weight. It is not required for Actual Body Weight.

### What does the serum creatinine floor option do?

When selected, serum creatinine values below 1.0 mg/dL are treated as 1.0 mg/dL.

### Is the result indexed to body surface area?

No. The result is an unindexed CrCl in mL/min, not a BSA-indexed eGFR.

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