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Creatinine Clearance Calculator (Cockcroft-Gault)

· Last updated：2026-08-05

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

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.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Health
Input types
number, select, checkbox
Output type
json
Sample coverage
4
API ready
Yes

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.

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

  1. 1Enter the patient’s age, actual body weight, serum creatinine, and optional height when using IBW or AdjBW.
  2. 2Select sex and a weight basis: ABW, IBW, or AdjBW.
  3. 3Optionally floor serum creatinine at 1.0 mg/dL for elderly or low-muscle-mass patients.
  4. 4The 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.

Examples

1. ABW-based CrCl estimate for a male patient

Clinician

Background

A 70-year-old male has an actual body weight of 75 kg and serum creatinine of 1.0 mg/dL.

Problem

Calculate creatinine clearance using Actual Body Weight.

How to use

Enter age 70, select Male, enter weight 75 kg and serum creatinine 1.0 mg/dL, then select ABW.

Outcome

The calculator returns CrCl = 72.9167 mL/min using ABW, with serum creatinine of 1.0 mg/dL.

2. IBW-based CrCl estimate for a female patient

Pharmacist

Background

A 55-year-old female weighs 60 kg, is 160 cm tall, and has serum creatinine of 0.9 mg/dL.

Problem

Calculate CrCl using Devine Ideal Body Weight rather than actual body weight.

How to use

Enter age 55, select Female, enter weight 60 kg, height 160 cm, serum creatinine 0.9 mg/dL, and select IBW.

Outcome

The calculator uses an IBW of 52.3819 kg and returns CrCl = 58.4042 mL/min.

FAQ

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.

Hub

Renal Function, Dialysis, and Dose-Model Checks

Compare kidney-function formulas, dialysis adequacy metrics, and renal medication math in an educational workflow that avoids patient-specific dosing or diagnosis.

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