ModelCalcs.uk
Mixed Scale Calculator — Convert Between Scales
Convert a dimension directly from one model scale to another without needing to know the real-world size.
How We Calculate This
The calculator converts from one scale to another via the real-world dimension.
Formula
Target size = Source size × (Source scale ÷ Target scale)
Example: A 1:72 model part measures 15mm. To make the same part in 1:48:
15 × (72 ÷ 48) = 15 × 1.5 = 22.5mm.
Frequently Asked Questions
When adapting plans or references from one scale to another. For example, using a 1:72 kit as a reference to scratch-build the same subject in 1:48, or checking if a diorama accessory from one scale works in another.
The calculator first converts the source-scale measurement back to real-world size (multiply by the source scale factor), then converts to the target scale (divide by the target scale factor). The net effect is multiplying by the ratio of the two scale factors.
Yes. Find the conversion factor (source scale / target scale) and use it as the scaling percentage in your 3D slicing software. For example, 1:72 to 1:48 = 72/48 = 1.5, so scale the file to 150%.
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Last updated: February 2026
All calculations are estimates. Always verify quantities before purchasing materials.