Paper testing calculators
Grammage
Basis weight from a cut sample — the figure every index below divides by.
Enter sample mass and sample area to calculate.
Bulk & Density
How much thickness a sheet carries per gram — the compressibility of the furnish.
Enter thickness and grammage to calculate.
Bursting Index
Bursting strength normalised against grammage, so grades compare like for like.
Enter bursting strength and grammage to calculate.
Tear Index
Tearing resistance per unit grammage, from an Elmendorf run.
Enter tearing resistance and grammage to calculate.
Tensile Index & Breaking Length
Tensile strength normalised against grammage, and the classic equivalent length.
Enter tensile strength and grammage to calculate.
Moisture Content
Loss on drying, as a percentage of the original wet mass.
Enter mass before drying and mass after drying to calculate.