Drawing Scale Calculator — Convert Measurements

A 1:2 scale means the drawing is half the size of the real object. Every 1 mm on the drawing represents 2 mm in reality. Common architectural scales include 1:50, 1:100 and 1:200.

Choose a scale that fits your subject onto your paper. For small objects, 1:1 (full size) or 2:1 (double size) works well. For room interiors, try 1:20 or 1:50. For buildings, 1:100 or 1:200 is common.

Yes, use a ratio less than 1. For example, 1:0.5 means the drawing is twice real size. This is useful for detailed studies of small objects like insects, jewellery or botanical illustrations.