Estimate cardboard box or sheet mass from board area and grammage, or estimate board grammage from its paper layers. Box dimensions use cm, mm or inches; results include g, kg, oz and lb.

Simplified rectangular RSC blank; manufacturing allowances vary.

Estimates board mass, not carrier dimensional weight. Use supplier grammage and actual blank dimensions for a closer estimate; board presets and take-up factors are illustrative.

Cardboard Box Weight Formula

The following formula is used to calculate the Cardboard Box Weight. 

M = A × G

Variables:

  • M is the estimated board mass (g)
  • A is the rectangular blank or sheet area (m²)
  • G is the combined board grammage (g/m²), preferably supplied by the manufacturer
  • For the simplified RSC estimate, blank length = 2 × (box length + box width) + joint allowance, and blank width = box width + box height + width allowance. Use consistent length units.

Multiply blank area in square metres by combined grammage in grams per square metre. The box mode estimates a rectangular RSC blank; actual score positions, board thickness, slots and finishing materials can change finished mass. Use sheet mode with the actual blank dimensions for a closer estimate. Dividing box volume by a carrier divisor gives dimensional shipping weight, not physical cardboard mass.

How to Calculate Cardboard Box Weight?

These examples use combined board grammage of 500 g/m², a 35 mm joint allowance and a 6 mm blank-width allowance, with no additional mass allowance. These are illustrative assumptions, not standard values for every board grade or box.

Example Problem #1

  1. First, determine the  cardboard box length (in).
    • The  cardboard box length (in) is calculated to be 10.
  2. Next, determine the  cardboard box width (in).
    • The  cardboard box width (in) is measured to be 15.
  3. Next, determine the  cardboard box height (in).
    • The  cardboard box height (in) is found to be 20.
  4. Finally, calculate the Cardboard Box Weight using the formula above: 

M = blank area × combined board grammage

The values provided above are inserted into the equation below and computed.

For 10 × 15 × 20 inches, the estimated blank is 1,305 × 895 mm. M = 1.167975 × 500 ≈ 583.99 g.

Example Problem #2

The variables required for this problem are provided below:

 cardboard box length (in) = 15

 cardboard box width (in) = 15

 cardboard box height (in) = 30

Test your knowledge and check your answer with the calculator.

For 15 × 15 × 30 inches, the estimated blank is 1,559 × 1,149 mm. M = 1.791291 × 500 ≈ 895.65 g.