[header] How to measure length [title] Choose the most appropriate tool. [step] There are several tools you can use to measure length, but the right tool will depend on the unit system you plan to use and the size of the length you wish to measure. [substeps] Rulers are stiff, straight edges with graduated markings. 
Typically, one side has markings for inches and the other side has markings for centimeters. These tools are good to use for relatively short lengths.