Architect Scale Calculator
Pick a drawing scale, enter a measurement from the plan, and convert it to real-world size instantly.
Metric scales (1:N) mean 1 unit on the drawing equals N units in real life. Imperial architectural scales (e.g. 1/4″ = 1′) mean a fraction of an inch on paper equals one real foot.
Frequently asked questions
How does an architectural scale work?
A drawing scale like 1:50 means 1 unit on paper equals 50 real-world units — measure 1 cm on the drawing and the real object is 50 cm. Imperial architectural scales like 1/4″ = 1′ mean a quarter-inch on paper represents one real foot.
What's the most common scale for floor plans?
1:50 (metric) and 1/4″ = 1′ (imperial) are the most common scales for residential floor plans — detailed enough to show room layouts and furniture placement. Site plans typically use smaller scales like 1:100 or 1:200 to fit a whole property on one page.
How do I convert a scale drawing measurement to real size?
Measure the distance on the drawing, then multiply by the scale ratio. This calculator does the math for you — pick your scale, enter the measured distance in centimeters, and get the real-world size in meters and feet instantly.
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