3D model scale calculator

Find the percentage scale setting needed to change a model dimension to your target size.

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3D model scale calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Current model dimension

Wanted dimension

Answer

…

Find the percentage scale setting needed to change a model dimension to your target size.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

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

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Both measurements use the same unit. Uniform scaling changes every length by the same factor and volume by its cube; it does not account for printer shrinkage.

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

Scratch calculator

Check another calculation

Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

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Updated 2026-09-26

Using 3D model scale calculator

Find the percentage scale setting needed to change a model dimension to your target size.

Both measurements use the same unit. Uniform scaling changes every length by the same factor and volume by its cube; it does not account for printer shrinkage.

Next: Scale calculator

A worked example

Example inputs: current model dimension = 40, wanted dimension = 100. Scale setting (%) = 250.

Before you use the result

Both measurements use the same unit. Uniform scaling changes every length by the same factor and volume by its cube; it does not account for printer shrinkage.

Example results for current model dimension

These examples use Wanted dimension: 100. They are reference calculations, not recommended settings.

Current model dimension	Scale setting (%)
20	500
40	250
80	125

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ToolOctopus. “3D model scale calculator.” Updated 2026-09-26. https://tooloctopus.com/3d-model-scale-calculator.

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