How do I set the correct architectural scale in Plan7Architect?

In Plan7Architect, the “1:100” value you see in the Scale field is simply a ratio — it means 1 unit on the drawing equals 100 units in real life.
It is not metric or imperial by itself — just a proportional relationship.

For example:

• 1:100 → 1″ on screen equals 100″ in reality.

• 1:48 → 1″ on screen equals 48″ in reality (this is the same as 1/4″ = 1′).

• 1:96 → 1″ on screen equals 96″ in reality (this is the same as 1/8″ = 1′).

If you’re using 1/8″ per 6″ or 1/4″ per foot, both equal a 1:48 ratio — the most common U.S. architectural scale.

To set your scale correctly:

1. Go to Settings → Units and choose Feet & Inches.

2. Under Scale, type or select 1:48.

3. If you’ve imported a scanned or JPEG drawing, use Scale / Calibrate on a known measurement (for example, trace over a 12′ wall and set that line to exactly 12′ 0″).

4. Your image will then be perfectly scaled, and you can continue drawing over it in real dimensions.

Common U.S. architectural scales for reference:

This lets you design in real-world dimensions while displaying or printing your project in any U.S. architectural scale you prefer.