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Drawing Scale Calculator

Convert between drawing and real dimensions at architectural and engineering scales.

Enter values

Results update as you type.

Result

Real measurement

6 m

In millimetres
6,000
In feet
19.685
Scale
1 : 50
1 mm on the drawing equals
0.05 m

About the Drawing Scale Calculator

Convert between drawing and real dimensions at architectural and engineering scales.

Also known as: architectural scale calculator, blueprint scale, plan scale converter, scale drawing calculator.

How to use this calculator

  1. Enter calculate, scale and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

real size = drawing size × scale denominator

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: Real size from drawing
  • Scale: 1:50
  • Drawing measurement = 120 mm

the calculator returns:

  • Real measurement: 6 m
  • In millimetres: 6,000
  • In feet: 19.685
  • Scale: 1 : 50