Model Railway Scale Calculator
Compare any two scales, convert a size from one scale to another, or work out model sizes from real life.
Want to know how to convert one scale to another?
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Enter the size and scale of the item and then what scale you want to convert it to.
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Turn a real measurement into the size you want in the scale you want.
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Model railway scale reference
| Scale | Ratio | Track gauge | mm per metre | Typical use |
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Ratios are the figures commonly quoted by manufacturers. OO is 1:76.2 (4 mm to the foot) running on 16.5 mm track, which is a compromise gauge, so the track is narrower than true scale.
Results are for lengths only. Areas change by the square of the ratio and volumes or weights by the cube.