The Ultimate Scale Converter
Convert architectural, engineering, model, and map scales instantly. Accurate, fast, and free.
Scale Converter
1:50·architectural
Popular Scales
Quick access to the most commonly used scale ratios.
Scale Categories
Browse scales organized by discipline and use case.
Architectural
Standard scales used in architectural drawings and building plans.
Engineering
Scales commonly used in civil, mechanical, and structural engineering.
Model & Miniature
Scales used for scale models, miniatures, tabletop gaming, and dioramas.
Map & Survey
Cartographic scales used in topographic maps, surveys, and GIS.
How Scale Conversion Works
Choose Your Scale
Select a scale ratio from our comprehensive library of architectural, engineering, model, and map scales.
Enter a Measurement
Type in a real-world measurement or a scaled measurement. Choose from millimeters, centimeters, meters, inches, feet, and more.
Get Instant Results
The conversion is calculated in real time as you type. Swap directions with one click to convert in either direction.
Frequently Asked Questions
- What is a scale ratio?
- A scale ratio expresses the relationship between a measurement on a drawing or model and the corresponding real-world measurement. For example, 1:50 means that 1 unit on the drawing represents 50 of the same units in reality.
- How do I convert from real-world to scaled measurements?
- Divide the real-world measurement by the scale factor. For instance, at 1:100, a 5-meter wall would be drawn as 50 mm (5000 mm ÷ 100 = 50 mm).
- What scales do architects use?
- Common architectural scales include 1:50 for floor plans and elevations, 1:100 for general arrangements, 1:200 for site plans, and 1:5 or 1:10 for construction details.
- What is the most popular model scale?
- It depends on the subject. For military models, 1:35 is the most popular. For aircraft, 1:72 dominates. For model railways, HO scale (1:87) is the worldwide standard.
- Is this converter free to use?
- Yes. ScaleConvert.pro is completely free with no registration required. Use it as many times as you need for any project.