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# How do I know the length of my Clock Pendulum?

The pendulum length (cm) will be from the suspension post all the way down to the bottom of the pendulum nut threads. So this pendulum length (cm) includes the pendulum from tip to tip, the leader it hangs on, and the suspension spring the leader hangs on all in one measurement. This pendulum length will not always be exactly what is marked on the movement, There are other factors such as the pendulum bob diameter and how much the bob weighs. If the CM length on the old unit matches the CM length on the new unit, this is all that is needed.