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Paper Sheet Mass, Grammage & 500-Sheet Basis

Calculate sheet and stack mass from grammage, or convert 500-sheet basis weights using retained paper-size and basic-sheet presets.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

An A4 sheet measuring 210 mm by 297 mm at 80 g/m² weighs 4.9896 g. A stack of 500 weighs 2494.8 g before packaging.

Sheet mass = grammage × sheet area; grammage = basis weight in grams / (500 × basic-sheet area in m²)

Worked example

Enter these known values and leave the other values blank.

Paper mass specification
Grammage
Paper size
A4 (210 mm x 297 mm)
Grammage in grams per square meter
80 gsm
Number of finished sheets
500 sheets
Weight per sheet
4.99 g
Total weight
2495 g

Assumptions and limitations

  • Basis weight refers to 500 sheets of the selected basic stock size. Different paper families have different basic sizes, so the same pound rating does not imply the same grammage.
  • Sheet presets use their stated nominal dimensions. The A-series millimeter dimensions are converted exactly rather than through the source’s rounded inch values.
  • Quantity is a nonnegative whole number of finished sheets. Actual paper can vary with moisture, coating and manufacturing tolerance; packaging mass is excluded.
  • Changing paper size or basic stock size retains the other inputs. Custom dimensions remain available in each selector.

Common questions

Why does 20 lb bond differ from 20 lb cover?

The pound value describes 500 sheets of different basic sizes. Divide by the actual basic-sheet area before comparing grammage.

References

Bookify supports zero sheets and requires whole sheet counts. Bookify uses the exact international pound and inch in the 500-sheet basis-weight conversion, replacing the rounded captured factor. Bookify converts each stated A-series millimeter dimension exactly into the internal inch basis instead of using rounded inch presets.

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