Measuring for Tall Boots

Using a soft tape measurement and having someone help you will provide the most accurate measurements.

Take measurements whilst wearing the breeches (and socks if applicable) that you most commonly ride in
Measure whilst standing in a comfortable position
Hold the tape measure firm but not tight
Ensure you take multiple measurements from both calves to ensure you have found the widest point

Take the height measurement whilst standing, barefooted
Measure at the back of the leg, from the floor to where the back of your knee creases
If you're primarily jumping and comfort is your main concern, you may wish to take 1-2cm off your measurement
If you're primarily riding dressage and wish to have the appearance of an elongated leg, you may wish to add 1-2cm to your height
Keep in mind that your boots will drop 1-3cm in height