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Thermoformed Part Material Weight Calculator

Calculate gross sheet material allocated to one thermoformed part from web width, machine pitch, parts across and sheet GSM.

Use a saved product specification (optional)
01 / INPUTS

Enter your values

First time using this calculator?

Replace the example values with figures from your supplier sheet or measurements. Choose the unit beside each value. Results update as you type; fix any highlighted field before using the result.

GSM means grams per square metre. Net weight excludes the core and other packaging. MOQ means the minimum order quantity. An optional field can stay blank unless the result you need depends on it.

Prices keep the selected currency; changing its label does not convert an exchange rate. Save or export the result after checking your inputs.

Help with web width

Measure the full width of the flat material from edge to edge, rather than the width of one finished pack. Choose the matching unit.

units
g/m²
Help with sheet gsm

GSM is the weight of one square metre of material, in grams. Find it on the supplier specification; use the complete laminate value for layered film.

Results update as you edit. Nothing is saved until you choose to.
02 / RESULTExample result — replace the inputs

Gross sheet material allocation per part

36.00 g/part
Gross web area per part0.0600 m²/part
Gross allocation per 1,000 parts36.00 kg/1,000 parts

This is gross web allocation, not finished part weight. The difference includes skeleton trim and any material outside the retained part.

Assumes one machine-direction row of parts per entered pitch; include all cavities across that repeat.

THE CALCULATION

Gross g/part = web width (m) × machine pitch (m) ÷ parts across × sheet GSM

0.8 × 0.3 ÷ 4 × 600 = 36 g/part
Example result — replace the sample valuesThe formula works, but the values are illustrative.

Saved calculations stay in this browser. No account or cloud backup is created.

Save to a product project (optional)Choose or create a saved product project ↗

This is an illustrative example. Saved or transferred values must be checked against your job.

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Calculated from your inputs. Confirm specifications with your supplier.

How sensitive is this result to your assumptions?

Vary one input and inspect gross sheet material allocation per part

All other entered inputs stay fixed. Ranges are your scenarios, not statistical confidence or supplier performance predictions. This uses the same validated calculator engine.

UNDERSTAND THE CALCULATION

The formula, made clear.

Gross allocation/part (g) = Web width × Machine pitch ÷ Parts across × Sheet GSM

Each machine pitch consumes a rectangle of sheet. Dividing that area by the number of parts across allocates its mass to each nominal part position. This includes surrounding skeleton and layout material, so it is not necessarily the weight of the trimmed finished tray or cup. Weigh a finished sample to establish retained part mass.

How to use this calculator

  1. 01

    Enter full forming-web width and machine pitch.

  2. 02

    Enter parts across and actual sheet GSM.

  3. 03

    Use the result as gross material allocation per part position.

WORKED EXAMPLE

A calculation you can check

The example apportions one pitch of thermoforming sheet across its part positions without treating the trim skeleton as retained part weight.

Web width
800 mm
Machine pitch
300 mm
Parts across
4 units
Sheet GSM
600 g/m²
0.8 × 0.3 ÷ 4 × 600 = 36 g/part
Gross sheet material allocation per part36.00 g/part
HOW TO VERIFY THIS RESULT

Check the displayed formula and units against your quotation. Use measured GSM, net weight and actual layout dimensions where available. Default densities are planning assumptions, not certified material properties. Calculated cost does not certify strength, compatibility or safe loading.

Method, units and material assumptions ↗