Model Railroad Scale Converter
Real to Model Scale
Convert real-world dimensions to model scale
Model to Real Scale
Convert model dimensions to real-world size
Scale Speed Calculator
Convert real speed to scale speed
Formula
Model Size = Real Size / Scale Ratio | Real Size = Model Size × Scale Ratio | Scale Speed = Real Speed / Scale Ratio
Frequently Asked Questions
What is HO scale?
HO scale is the most popular model railroad scale at 1:87.1 ratio. One foot in real life equals approximately 0.138 inches (3.5mm) in HO scale. HO stands for 'Half O' as it is roughly half the size of O scale. Track gauge is 16.5mm.
What is the difference between N scale and HO scale?
N scale (1:160) is roughly half the size of HO scale (1:87.1). N scale allows larger layouts in smaller spaces. HO has more available models and is easier to detail, while N scale is better for apartment-sized layouts and dramatic scenery.
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