Architectural Scale Explained
Architectural scales allow blueprints and drawings to represent real-world dimensions at a reduced size.
What Is a Scale?
A scale like 1:100 means 1 cm on the drawing = 100 cm (1 m) in reality. Common scales include:
| Scale | 1 cm = | Use |
|---|---|---|
| 1:50 | 50 cm | Detailed floor plans |
| 1:100 | 1 m | Standard floor plans |
| 1:200 | 2 m | Site plans |
| 1:500 | 5 m | Master plans |
How to Read a Scale Ruler
- Find the scale matching your drawing
- Place the ruler on the drawing
- Read the measurement directly — no math needed!
Imperial vs Metric Scales
- Imperial: 1/4” = 1’-0” (common in US)
- Metric: 1:100 (common internationally)
Tips
- Always check the scale noted on the drawing
- Use the correct edge of the scale ruler
- Don’t scale from copies — they may be resized
- When converting between metric and imperial plans, use our converter