How do I convert a drawing measurement to real size?

Multiply by the scale. 25mm measured on a 1:50 drawing is 25 × 50 = 1250mm in reality.

How do I convert a real dimension to drawing size?

Divide by the scale. A 3600mm wall drawn at 1:100 is 36mm on the drawing.

What scales are used for UK architectural drawings?

Location plans are usually 1:1250 or 1:2500, site and block plans 1:500 or 1:200, general arrangement plans, sections and elevations 1:100 or 1:50, and details 1:20, 1:10 or 1:5.

What happens to scale when a drawing is printed smaller?

The scale changes in proportion. Printing an A1 sheet on A3 halves every dimension, so 1:50 becomes 1:100. Always check scale bars and sheet sizes before scaling off a print.

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Scale
converterBETA

Convert dimensions between drawing scales. Input through the measurement and select input and output scales.

Results from brickdims.com tools are indicative only. Using this site does not create a professional relationship or duty of care. Not a substitute for professional advice or formal compliance sign-off.

Scale conversion

Drawing measurement (mm)

Input scale

Output scale

Drawing measurement at 1:1

5,000 mm

Real-world dimension

5,000 mm

5.000 m

Full scale conversion table

Real-world size for 100 mm measured on a drawing at each scale. Click a row to set it as the input scale.

Scale	Real size (mm)	Real size (m)	1mm on drawing =
1:1	100 mm	0.1	1 mm
1:2	200 mm	0.2	2 mm
1:5	500 mm	0.5	5 mm
1:10	1,000 mm	1	10 mm
1:20	2,000 mm	2	20 mm
1:25	2,500 mm	2.5	25 mm
1:50	5,000 mm	5	50 mm
1:100	10,000 mm	10	100 mm
1:200	20,000 mm	20	200 mm
1:250	25,000 mm	25	250 mm
1:500	50,000 mm	50	500 mm
1:1000	100,000 mm	100	1,000 mm
1:1250	125,000 mm	125	1,250 mm
1:2500	250,000 mm	250	2,500 mm

ScaleconverterBETA