// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
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hobby.model-train-scale Calculator
Converts real-world object dimensions to model scale (N, HO, O, G, etc.) and back, and calculates minimum curve radius for a given locomotive length. Model trains derail on curves too tight for their wheel base — this prevents layout planning mistakes.
Inputs
Real Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Scale
Reference formula or conversion factor shown for context.
Layout Width M
Horizontal extent perpendicular to the length.
Min Curve Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
Results
model length (cm)
The computed linear length.
model length (mm)
The computed linear length.
min curve radius represents (m)
The computed radius -- half the diameter.
one oval track length (m)
The computed linear length.
scale
Reference formula or conversion factor shown for context.
HO gauge
Reference formula or conversion factor shown for context.