Scale Drawing Calculator
Convert a real measurement and a drawing measurement at a scale, with consistent units.
Your result
Enter the length and the scale.
How to use it
- Choose the unit and the direction.
- Enter the length and the scale denominator.
- Read the three lengths.
Examples
- 10 metres at 1:5010 metres to the drawing and a denominator of 50. 200.000 mm, 20.000 cm, and 0.200 m.
- Reverse 200 millimetres200 mm to real size and a denominator of 50. 10.000 m.
- A denominator of zeroThe denominator is 0. A message asks for a denominator of 1 or more.
Tool details and privacy
The scale is 1:N. To the drawing divides the length by N. To real size multiplies it by N.
The result is shown to three decimal places in millimetres, centimetres, and metres together.
Options
- The length allows three decimal places. The denominator is from 1 to 1000000.
Limits
- Amounts use two decimal places and up to 12 digits before the decimal point. Rounding is half up.
- 1,250 is rejected. Write 1250 or 1250.50.
- This converts a length only, not an area.
Privacy
The numbers are calculated in your browser and are not sent to any server.
Questions
How long is 10 m at 1:50 on the drawing?
200 millimetres, which is 20 centimetres or 0.200 metres.
Do 200 mm return to 10 m?
Yes, when the direction is to real size and the denominator is 50.
Does it convert area?
No. Length only.
What is the largest denominator?
1000000.