# Scale Conversion Calculator – Convert Measurements to a Scaled Size

Scale a measurement to a larger or smaller measurement, which is useful for architecture, modelling, and other projects. You can also add the real size and scaled size to find the scale factor.

## Find the Scaled Size

## Find the Scale Factor

## How to Scale a Measurement Larger or Smaller

Making a measurement smaller or larger, known as scale conversion, requires a common scale factor, which can be used to multiply or divide all measurements by.

To scale a measurement to a smaller measurement, for instance when making a blueprint, simply divide the real measurement by the scale factor. The scale factor is commonly expressed as **1:n** or **1/n**, where **n** is the factor. For example, if the scale factor is 1:8 and the real measurement is 32, divide 32 ÷ 8 = 4 to convert.

To convert a measurement to a larger measurement simply multiply the real measurement by the scale factor. For example, if the scale factor is 1:8 and the measured length is 4, multiply 4 × 8 = 32 to convert.

## Reducing the Scale Factor

The methods above to convert a measurement assume the scale factor is in the form of **1:n** or **1/n**, which means some additional work is needed if the ratio is 2:3, for example. When the scale factor is not in an even 1:n ratio it will need to be reduced to 1:n. Use our ratio calculator to reduce a ratio. A ratio can also be reduced by dividing both the numerator and the denominator by the numerator.

**For example:** 2/3 can be reduced by dividing both numbers by 2, which would be 1/1.5 or 1:1.5.

2 ÷ 2 = 1

3 ÷ 2 = 1.5

scale factor = 1:1.5

## Commonly Used Architectural Scales

Architectural Scale | Scale Factor |
---|---|

1/16″ = 1′ | 1:192 |

3/32″ = 1′ | 1:128 |

1/8″ = 1′ | 1:96 |

3/16″ = 1′ | 1:64 |

1/4″ = 1′ | 1:48 |

3/8″ = 1′ | 1:32 |

1/2″ = 1′ | 1:24 |

3/4″ = 1′ | 1:16 |

1″ = 1′ | 1:12 |

1 1/2″ = 1′ | 1:8 |

3″ = 1′ | 1:4 |

## Commonly Used Model Scales

Scale Factor | Model Type |
---|---|

1:4 | steam trains, RC planes |

1:8 | steam trains, cars |

1:10 | figures |

1:12 | cars, motorcycles, dollhouses |

1:16 | steam trains, cars, motorcycles, military vehicles, figures |

1:18 | diecast cars |

1:20 | formula one cars |

1:22.5 | G-gauge trains |

1:24 | cars, trucks, aircraft, dollhouses |

1:25 | cars, trucks |

1:32 | 1 gauge trains, cars, aircraft, figures |

1:35 | military vehicles |

1:43 | O-gauge trains, cars, trucks |

1:48 | O-gauge trains, dollhouses, Lego minifig |

1:64 | S-gauge trains, diecast cars, Hotwheels:Matchbox |

1:72 | aircraft, military vehicles, boats, cars |

1:76 | aircraft, military vehicles |

1:87 | HO-gauge trains, military vehicles |

1:96 | ships, spacecraft |

1:100 | aircraft, spacecraft |

1:120 | TT-gauge trains |

1:144 | ships, rockets, spacecraft |

1:160 | N-gauge trains, wargaming |

1:200 | aircraft, ships |

1:220 | Z-gauge trains |

1:285 | wargaming |

1:350 | ships |

1:700 | ships |

1:720 | ships |