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CAD Scale Calculator

Convert measurements between drawing scale and real-world dimensions instantly. Pick a scale, type a number, get the answer — works in millimetres, centimetres, metres or inches.

Measured length on drawing

Unit

Drawing scale (1 : N)

Real-world length

5.00m

50 mm × 100 = 5,000 mm

How scale works. A scale of 1:100 means every 1 unit on the drawing represents 100 units in the real world. So 50 mm on a 1:100 plan is 5,000 mm (5 m) in reality. Common architectural scales: 1:50, 1:100, 1:200 for floor plans; 1:1000, 1:1250, 1:2500 for site and OS plans.

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