Architectural Scale Converter
Convert between real-world dimensions and what they measure on paper, across US and metric drawing scales.
Drawing size (imperial)6"
Drawing size (mm)152.4 mm
Drawing size (cm)15.24 cm
How scale works
A drawing scale is a ratio between paper and reality. 1/4" = 1'-0"
means a foot of building is drawn as a quarter inch — a 1:48
ratio. Metric drawings use the ratio directly: 1:50 means one
unit on paper is fifty in reality.
Choose a direction and a scale, then enter a dimension in any format. The converter handles US scales (1/16" to 3") and metric ratios (1:5 to 1:1000).