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Scale comparison

Compare the same object in different scales. Choose your scale and see how much space it needs on your layout.

Model scale

Scale denominator (1:n)

Real dimensionUnit

Compare dimensions across all scales. Your chosen scale appears first.

Units, scales and calculation method

At 1:n, model dimensions equal real dimensions divided by n. Speed is scaled proportionally. Grade uses the horizontal run; ramp length uses the Pythagorean theorem. Results use up to 8 significant digits.

Standard and narrow gauge scales follow NEM 010, with T (1:450) and 00 (1:76.2) also available. Narrow gauge variants share the parent scale ratio. For other standards, choose a custom scale (1:1 to 1:10000). An inch is 25.4 mm; a foot is 304.8 mm. Sources: MOROP NEM 010 (PDF) · T Gauge · NIST

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