Model Scale Calculator
Convert real-world sizes to model sizes and back for any scale — 1:24, 1:43, 1:87 (HO), 1:160 (N) and more — in mm, cm or inches.
How to use
- 1Choose a scale (or enter a custom 1:N).
- 2Enter a real size to get the model size, or a model size to get the real size.
How it's calculated
Model size = real size ÷ N. Real size = model size × N.
Frequently asked questions
What are common model railway scales?
O (1:48 US / 1:43.5 UK), HO (1:87), OO (1:76.2), N (1:160) and Z (1:220).
What scale are most die-cast cars?
1:18, 1:24, 1:43 and 1:64 are the most common.
Does scale apply to weight?
No — volume and weight shrink with the cube of the scale, so a 1:10 model weighs about 1/1,000 as much if made of the same material.