Convert a real-world measurement to its equivalent on a scaled model — for model cars, railways, architecture, or any scaled reproduction.
How it works
Model measurement is the real measurement divided by the scale ratio: model = real ÷ ratio. A 48-inch real object at 1:24 scale becomes a 2-inch model.
What this does not include
This scales a single linear measurement. Area scales with the square of the ratio and volume with the cube, so this calculator’s straight division doesn’t directly apply to those.
How to use this calculator
- Enter the real-world measurement.
- Enter the scale ratio (the second number in “1:24”).
What does “1:24 scale” actually mean?
It means every unit on the model represents 24 of the same unit in real life — a 24-inch real object becomes a 1-inch model at that scale.
What scale is common for model railways?
HO scale (1:87) is one of the most popular model railway scales worldwide, though N scale (1:160) and O scale (1:48) are also widely used.
How do I scale up from a model to real-world size instead?
Multiply the model measurement by the scale ratio instead of dividing — the reverse of what this calculator does.
