Cobb Test Calculator in Excel
Professional free tool to calculate water resistance in paper and cardboard according to TAPPI T 441 standard. Get automatic results with average, range interpretation and complete guide included.
They trust our calculator:
Cobb Test Calculator
Free tool to calculate water resistance
Cobb (g/m²) = (Final Weight - Initial Weight) × 100
Why use our calculator?
Everything you need to perform and analyze the Cobb test in one professional tool.
Save Time
Automatic calculations with average of up to 5 samples. Forget manual formulas.
Official Standard
Based on TAPPI T 441 standard for accurate and reliable results.
Expert Guide
Includes step-by-step instructions and results interpretation table.
100% Free
No hidden costs, no subscriptions. Just enter your data and download.
What is included in the calculator?
A complete tool that includes everything needed to perform the Cobb test professionally.
About Coaterex
Learn about our experience in water-based coatings and paper technology.
What is the Cobb Test?
Understand the basis of this standardized test for measuring water absorption.
Step-by-Step Procedure
Detailed guide with necessary equipment and times according to TAPPI T 441.
Automatic Calculator
Enter initial and final weights of up to 5 samples and get automatic results.
Results Interpretation
Complete reference table to evaluate the water resistance of your materials.
“This calculator has saved us a lot of time in the laboratory. The included results interpretation is very useful for explaining Cobb values to customers.”
Maria Gonzalez
Quality Manager, Northern Packaging
Download Calculator
Complete the form and receive the calculator in your email
Results Interpretation
Interpret your Cobb results with our reference table included in the calculator.
| Cobb Range | Resistance Level | Recommended Applications |
|---|---|---|
| < 10 g/m² | Very good resistance | Refrigerated, plastic replacement, high-demand packaging |
| 10 - 20 g/m² | Good resistance | Standard packaging and labels, dry products |
| 20 - 50 g/m² | Moderate resistance | Controlled humidity, dry environments, indoor use |
| > 50 g/m² | Low resistance | Requires more protection, limited use, untreated materials |
Frequently Asked Questions
Answers to the most common questions about the calculator and the Cobb test.
Yes, the calculator is completely free. You just need to complete the form with your information to receive it in your email. There are no hidden costs or mandatory subscriptions.
Related Resources
Explore more content about the Cobb test and water barrier coatings.
Complete Cobb Test Guide
Learn everything about how to perform the Cobb test step by step according to TAPPI T 441 standard.
Read guideWater Barrier Coatings
Discover our waterproofing solutions for paper and cardboard.
View productsNeed help?
Our technical team is ready to advise you on laboratory tests.
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