Scale Conversion Calculators
Convert real-world measurements to any model scale and back. Compare scales, calculate speed, weight, area and volume at scale.
Scale Calculator
Convert any measurement between real world and model scale. Supports all common scales.
Real to Scale Converter
Convert a real-world measurement down to your chosen model scale.
Scale to Real Converter
Convert a model measurement back up to find the real-world equivalent.
Scale Ratio Calculator
Find the scale ratio from a real measurement and its model equivalent.
Mixed Scale Calculator
Convert a measurement from one model scale to another without going back to real size.
Scale Speed Calculator
Calculate the correct scale speed so your model moves at a realistic pace.
Scale Weight Calculator
Estimate the scale-equivalent weight of an object using the cube law.
Scale Area Calculator
Convert real-world areas to scale areas and back using the square law.
Scale Volume Calculator
Convert real-world volumes to scale volumes and back using the cube law.
Scale Comparison Calculator
Compare model sizes across different scales side by side.
10 free calculators in Scale Conversion
Understanding Scale Conversion
Scale conversion is the foundation of all model making. Whether you are building a 1:72 aircraft, a 1:35 tank, an OO gauge (1:76) railway layout, or a 1:700 waterline ship, every dimension on your model is the real-world measurement divided by the scale factor. Our calculators handle the maths so you can focus on building.
For linear measurements, dividing by the scale factor is straightforward. But areas scale by the square of the factor (a 1:72 surface is 1/5,184th of the real area) and volumes scale by the cube (1/373,248th at 1:72). Speed scales linearly, but the visual effect at model size means a 1:72 scale jet moving at scale Mach 1 would only be travelling at about 15 km/h on the tabletop.
Common modelling scales include 1:72, 1:48 and 1:32 for aircraft; 1:35 and 1:72 for armour; 1:350 and 1:700 for ships; OO (1:76), HO (1:87) and N (1:148/1:160) for railways; and 28mm (roughly 1:56) for wargaming miniatures. Our mixed scale calculator lets you convert directly between any two scales without intermediate steps.