Trim moulding calculator

Count stock lengths for separate trim runs when offcuts are not reused between runs.

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Separate cut lengths

Usable stock length

Answer

…

Count stock lengths for separate trim runs when offcuts are not reused between runs.

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Precision and calculation record

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Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

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Formula and assumptions

Each run uses ceiling(run length/stock length). Use an effective stock length after trim/kerf allowance. This is a conservative count, not a cut optimizer; visible joins and mitres need their own layout.

In a list, use spaces, new lines, semicolons, or commas followed by a space. A comma between groups of three digits is a thousands separator.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Trim moulding calculator

Count stock lengths for separate trim runs when offcuts are not reused between runs.

Next: Board foot calculator

A worked example

Example inputs: separate cut lengths = 2 3 4, usable stock length = 3. Stock lengths needed without offcut reuse = 4.

Before you use the result

Example results for usable stock length

These examples use Separate cut lengths: 2 3 4. They are reference calculations, not recommended settings.

Usable stock length	Stock lengths needed without offcut reuse
1.5	7
3	4
6	3

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ToolOctopus. “Trim moulding calculator.” Updated 2026-09-26. https://tooloctopus.com/trim-moulding-calculator.

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