Q&A for How to Measure Your Inseam

Use a pair of pants that fit the way you'd like. Lay them flat, then measure from the center crotch down the pant leg, along the inseam.

No. Inseam is the measurement taken from the pubic bone to the ankle, while length size is from the waist to the ankle.

Use whichever system is common to where you live. In the US, people generally use inches, but most of the rest of the world uses metric units. If you use the most prevalent units in your country, you stand a really good chance of finding a tailor who also uses those units.

You need to know where you want the cuffs on the pants. Typically that is where your ankles are when you wear the pants. You can find what the inseam is on a pair that fits to determine what size the inseam should be on the pair to be shortened. Be sure the pants are more or less similar: a pair of jeans can be used to determine where to shorten a pair of khakis. But do not use a pair of legging to do so...those pants are more stretchy and the fabric is not very similar.

You have been given a very simple answer that could cause a big problem in a hurry. Since fashion trends change often, first determine where you would like the hem edge to end. Sometimes it's closer to the ankle and other times almost dragging on the floor.