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Paper Weight Calculator

How much does your paper weigh? Choose a paper size, enter its GSM and the number of physical sheets. This paper weight calculator estimates one sheet or a stack, with custom dimensions for other rectangular sizes.

Estimate the weight of paper

Choose a size, enter the GSM shown on the paper packaging, and count the physical sheets.

Standard sizes use nominal dimensions. Choose Custom only if your paper has a different size.

GSM means grams per square metre (g/m²), not the weight of one sheet.

Count physical sheets, not printed pages. For a pack, use the sheet count stated on its label.

A decimal point or comma is accepted. Do not use thousands separators.

Estimated paper weight

Enter the paper’s GSM to see an estimate.

Paper only. Packaging, binding and other additions are not included. Weigh the finished parcel when an actual shipping weight is needed.

How this estimate is calculated

Totals shown in grams are rounded to 0.01 g; totals shown in kilograms to 0.001 kg. A value that rounds up to 1,000 g is shown in kilograms. Rounding is applied only after the total is calculated.

Converted dimensions may be rounded on screen. The calculation still uses your original measurements.

Calculations run in your browser. This calculator adds no upload or saved-input feature.

How to calculate paper weight

  1. Select the paper size. For a nonstandard rectangular sheet, choose Custom and enter its finished width and height in millimetres, centimetres or inches.
  2. Enter the GSM printed on the paper packaging or product specification. GSM is the weight in grams of one square metre of that paper.
  3. Enter the number of physical sheets. Keep 1 for a single sheet; for a pack or ream, use the quantity actually stated on its label.
  4. Read the paper-only estimate. Open the calculation details if you need the per-sheet estimate or formula, then copy or print the summary.

A straightforward sheet and stack calculator

  • Common A-series, Letter and Legal sizes use nominal dimensions; Custom covers other rectangular sheets.
  • The same form estimates one sheet or a whole stack from GSM and a physical sheet count.
  • One main answer uses grams or kilograms automatically. Per-sheet weight and the formula stay in closed calculation details.
  • Copy or print a summary that includes the selected size, inputs and paper-only limitations.

When a paper weight estimate is useful

  • Compare the approximate weight of different paper stocks for the same size and number of sheets.
  • Estimate the paper portion of a mailing or print order before adding packaging and other materials.
  • Check a pack’s nominal paper weight when its GSM and actual sheet count are known.

GSM, sheet size and physical sheets

GSM stands for grams per square metre. It describes mass per area, so paper size matters: a larger sheet at the same GSM weighs more. Multiply the sheet area in square metres by GSM and then by the number of sheets.

For dimensions in millimetres, divide width × height by 1,000,000 to obtain square metres. The A4 preset uses 210 × 297 mm, not a theoretical area of exactly 1/16 m². Letter uses exactly 8.5 × 11 inches, with 25.4 mm per inch.

Count pieces of paper, not page numbers. Printing on both sides still uses one physical sheet. A sheet count cannot be inferred from a document’s page count without knowing the printing and finishing arrangement.

GSM is not paper thickness. Paper construction and material can affect thickness at the same GSM. This calculator also does not convert GSM to a paper grade’s pound-based basis weight, which needs the correct basis size.

Paper weight examples

One nominal A4 sheet at 80 GSM: 210 × 297 ÷ 1,000,000 × 80 = 4.9896 g, displayed as approximately 4.99 g. For 500 sheets, multiply before rounding: 2,494.8 g, displayed as approximately 2.495 kg.

One nominal Letter sheet at 80 GSM uses 8.5 × 11 inches, or exactly 215.9 × 279.4 mm. Its calculated paper weight is 4.8257968 g, displayed as approximately 4.83 g.

A custom 10 × 15 cm sheet at 300 GSM has an area of 0.015 m². One sheet is approximately 4.5 g; 100 sheets are approximately 450 g.

What this estimate does not include

The result uses nominal or entered rectangular dimensions and stated GSM. Actual sheet size, moisture, coatings and manufacturing variation can change the measured weight.

Packaging, envelopes, binding, separate covers, labels and other additions are not included. This is not a postal rate calculator. Weigh the finished parcel before relying on a shipping weight or threshold.

A pack or ream is not assumed to contain 500 sheets. Use its stated quantity. The tool does not infer paper thickness, actual document sheet count, postage, strength or suitability for a printer.

Your entries and this calculator

The calculation runs in your browser. This calculator adds no upload, account, stored-input feature or input-sharing link.

The website’s existing analytics and cookie settings still apply. Copying and printing are actions you choose; summaries include your inputs and the estimate’s limitations.

Paper weight calculator questions

Using nominal dimensions of 210 × 297 mm, the calculated weight is 4.9896 g, shown as approximately 4.99 g. Actual paper can differ, so use a scale when a measured weight is required.

The paper-only calculation is 2,494.8 g, shown as approximately 2.495 kg. The wrapper or box is not included, and the actual sheet count should be checked.

No. GSM means grams per square metre. A sheet’s estimated weight depends on both its area and the GSM, so two different paper sizes at the same GSM do not weigh the same.

Enter physical sheets. A sheet printed on both sides is still one sheet. Page numbers alone do not establish the sheet count, especially for booklet layouts or separate covers.

Yes. Select Custom and enter the finished rectangular width and height in one shared unit: millimetres, centimetres or inches. Irregular cut-outs and other shapes are outside this calculator’s scope.

Not by itself. Thickness is a different property, and a paper grade’s pound-based basis weight depends on its basis size. Neither conversion is included here.

It is only an estimate of the paper portion. Additions such as an envelope, box or binding affect the finished weight. Use a scale for the actual parcel weight and check the carrier’s requirements.

The calculator multiplies the unrounded sheet value by the count, then rounds the total. Multiplying a displayed per-sheet value would accumulate rounding error.

Sources and assumptions

These sources explain the dimensions and quantities used. This estimate is not a measurement, a thickness conversion or a claim of compliance with a testing standard.

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