In reply to ilovetoclimb:
Climb up to the first clip.
Lower off.
Climb up one more clip
Lower off
Climb up one more clip
....
until you get to the top or can't keep going.
So if the route was 10 clips high you would have climbed
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55 clips or 5.5 x the total route length.
It's the climbing equivalent of this: