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Creatinine Clearance Calculator

Estimate creatinine clearance (CrCl) using the Cockcroft-Gault equation.

Complete Guide

Overview

Estimate creatinine clearance (CrCl) using the Cockcroft-Gault equation. Use this calculator to get instant, accurate results based on standard health formulas and guidelines.

⚠️This tool is for educational and screening purposes only and is not a substitute for professional medical advice.

How to Use

Enter your details in the input fields above.

Select your preferred units (metric or imperial) if available.

Click the Calculate button to view your instant results and interpretation.

Formula & Calculation

Refer to the in-depth guide below for complete calculation formulas.

Benefits of Using This Calculator

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Accurate Results

Provides instant calculations for creatinine clearance calculator.

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Clear Guidance

Compares your score against standard medical reference ranges.

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Fast & Free

No sign-up required — fast, private calculation on any device.

Pro Tips

Enter accurate measurements for the most reliable results.
Track your results over time to identify long-term trends.
Consult a qualified healthcare professional for medical interpretation.

In-Depth Guide

Creatinine Clearance Calculator: Assess Your Kidney Function

The kidneys filter waste from your blood at a rate that reflects their functional capacity. Creatinine Clearance (CrCl), calculated using the Cockcroft-Gault equation, estimates this filtration rate from a serum creatinine blood test — and is widely used for drug dosing in patients with kidney disease.

The Cockcroft-Gault Formula

CrCl (mL/min) = [(140 − Age) × Weight (kg)] ÷ (72 × Serum Creatinine mg/dL)
Multiply by 0.85 for females

Worked Example

Female, 65 years old, 60 kg, serum creatinine 1.1 mg/dL.
CrCl = [(140−65) × 60] ÷ (72 × 1.1) = 4500 ÷ 79.2 = 56.8 × 0.85 = 48.3 mL/min (Mild-Moderate decrease)

Calculate your CrCl with our Creatinine Clearance Calculator.

CKD Stage Classification

CrCl / eGFR (mL/min)	CKD Stage	Kidney Function
90+	Stage 1 (if markers present)	Normal or high
60–89	Stage 2	Mildly decreased
30–59	Stage 3	Moderately decreased
15–29	Stage 4	Severely decreased
Below 15	Stage 5	Kidney failure — dialysis

Clinical Use in Drug Dosing

CrCl from the Cockcroft-Gault equation is the standard used to adjust doses of renally-cleared drugs including antibiotics, diabetes medications (metformin, SGLT-2 inhibitors), blood thinners (apixaban, dabigatran), and many others. Using the wrong dose in kidney disease can cause drug toxicity.

Practical Tips

Serum creatinine alone is misleading. A muscle-wasted elderly person may have a "normal" creatinine (0.7 mg/dL) but actually poor kidney function — because less creatinine is produced from reduced muscle mass. CrCl corrects for this by including age and weight.

Get kidney function checked annually if you have hypertension, diabetes, or cardiovascular disease — the main causes of chronic kidney disease.

Final Thoughts

Creatinine clearance is essential for safe drug prescribing and for monitoring kidney disease progression. Understanding your result helps you have informed conversations with your doctor.

Calculate your kidney function with our free Creatinine Clearance Calculator.