Paper Strength Calculator

Calculate paper strength indices (tensile, tear, burst) from raw test data. Includes breaking length, TEA, and fold endurance estimates.

Basis weight (GSM)

Tensile strength (kN/m)

Tear strength (mN)

Burst strength (kPa)

Stretch at break (%)

Tab to move between fields

Tensile index (N·m/g)

56.25

Tear index (mN·m²/g)10

Burst index (kPa·m²/g)3.5

Breaking length (km)5.73

TEA index (J/g)0.98

Fold endurance (est.)517

Strength rating2

How to Use This Calculator

Enter the paper basis weight (GSM) of the sample you tested.
Input tensile strength (kN/m), tear strength (mN), and burst strength (kPa) from lab results.
Enter stretch at break (%) from the tensile test.
Review normalized Tensile Index, Tear Index, Burst Index, and Breaking Length (km).
Use Strength Rating (Poor/Fair/Good/Excellent) and Fold Endurance for quality classification.

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