Model Scale Calculator
Real to Scale Size
Convert real-world dimensions to scale model dimensions
Scale to Real Size
Convert model dimensions back to real-world size
Formula
Model Size = Real Size / Scale Factor
Frequently Asked Questions
What are common model scales?
Popular scales include: 1:87 (HO trains), 1:160 (N scale trains), 1:48 (O scale), 1:12 (dollhouses), 1:24 (model cars), 1:72 (aircraft), and 1:35 (military models). The ratio means the model is that many times smaller than reality.
How do I calculate model scale?
Divide the real measurement by the scale number. For 1:87 (HO scale), a 60-foot building becomes 60 × 12 / 87 = 8.28 inches tall in model form.
What scale is HO?
HO scale is 1:87, the most popular model railroad scale. The name comes from 'Half O' since it is roughly half the size of O scale (1:48). In HO, 1 foot = 3.5mm.
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