Heel to Pedal Method

The most common and straightforward method to use is known as the Heel-to-pedal method. While this doesn’t take into account all of the elements that can affect saddle height, it will get you in the ball park.

The heel-to-pedal method involves sitting on the bike, be it on the turbo trainer, holding on to a chair or table, or just leaning against a wall.

Place your heel on the pedal and pedal backwards to reach the six o’clock position. Your knee should be completely straight.
If your knee is still bent you need to increase the height, adjusting in small increments each time, and if your heel loses contact with the pedal then you need to lower the saddle.