How scale conversion works
A scale ratio such as 1:50 means that one unit on the drawing equals 50 of the same units in reality. To find the real-world measurement, multiply the drawing measurement by the scale factor. To find the drawing measurement, divide the real-world measurement by the scale factor.
The calculator handles both directions and converts the result to multiple units so the output is compatible with whatever measuring tools are available.
Real size = Scale size x Scale factor
Multiply the measurement on the drawing or model by the scale factor to get the actual size.
Scale size = Real size / Scale factor
Divide the real-world measurement by the scale factor to get the dimension to draw or build.