1:18 Scale to 1:24 Scale Conversion
These scales are close enough that aftermarket wheels, engines, and interior parts get swapped between 1:24 and 1:18 kits fairly often, but the 33% size difference is exactly the kind of thing that looks fine in photos and wrong on the shelf. This conversion tells you whether a part will actually fit before you commit glue or resin to it.
To convert a model dimension from 1:18 Scale to 1:24 Scale, multiply it by 0.75 (18 ÷ 24). The result is a smaller model — every length, width, and height changes by the same factor.
Conversion Chart
| 1:18 Scale size (mm) | 1:24 Scale size (mm) |
|---|---|
| 1 mm | 0.75 mm |
| 2 mm | 1.50 mm |
| 5 mm | 3.75 mm |
| 10 mm | 7.50 mm |
| 20 mm | 15.00 mm |
| 50 mm | 37.50 mm |
| 100 mm | 75.00 mm |
Frequently Asked Questions
How do I convert 1:18 Scale to 1:24 Scale?
Multiply any 1:18 Scale model dimension by 0.75 to get the 1:24 Scale dimension. This works because 1:18 Scale is 1:18 and 1:24 Scale is 1:24, so the factor is 18 ÷ 24 = 0.75.
Is 1:24 Scale bigger or smaller than 1:18 Scale?
1:24 Scale models are smaller: the same subject is only 0.75× the size in each dimension compared to 1:18 Scale.
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Reverse: 1:24 Scale to 1:18 Scale · 1:18 Scale guide · 1:24 Scale guide · Full calculator