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Measuring in large or baggy pants will make your calculations far too big, and measuring without pants will make it difficult to get accurate numbers. Instead, wear a pair of pants that sit close to the leg itself. If you plan on buying jeans using this measurement, wear pants similar in length to what you want to purchase. If you do not own a pair of properly fitted jeans, measuring your own inseam will give you the information necessary purchase some. Shoes add extra bulk and height that can mess with the length of your pants and throw off your measurements. To avoid this, remove your shoes so your feet touch the ground. Unless they're extremely bulky, feel free to keep your socks on. Slouching can throw off your measurements, so stand against a wall to make sure your posture stays good. Push your shoulders back and hold your torso up, keeping your back straight and tall. Keep your legs shoulder-width apart and make sure they're straight, not bent. Your feet should be flat on the ground. Hold a soft tape measure to your pants' crotch seam, about 1 to 2 inches (2.5 to 5.1cm) below your actual crotch. Measure down your inner leg until you reach the middle of your ankle. Your general inseam measurement will be listed on the tape measure. Remember to keep your legs straight, otherwise the measurement will not be accurate. If you have trouble finding this measurement on your own, ask a friend or family member to help.
Put on a pair of close-fitting pants. Take off your shoes. Stand up straight with your back against the wall. Measure your leg from crotch to ankle.