Model Railroad Scale Calculator

Convert real-world dimensions to model railroad scale dimensions for popular scales including HO, N, O, and G.

Real-World Length (feet)

Real-World Width (feet)

Real-World Height (feet)

Model Scale

Formula

Model Dimension (inches) = Real Dimension (feet) x 12 / Scale Ratio; Model Dimension (mm) = Model Dimension (inches) x 25.4

What is the most popular model railroad scale?

HO scale (1:87) is the most popular worldwide. It offers a good balance between detail and space requirements.

How do I convert real dimensions to scale?

Divide the real dimension by the scale ratio. For HO scale, divide by 87. A 50-foot building becomes about 6.9 inches in HO.

How much space do I need for a model railroad?

A basic HO layout needs at least a 4 by 8 foot table. N scale can fit in smaller spaces. O and G scale require significantly more room.

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