Calibrating new keggle

So we recently bought an old Sanke keg and converted it into a brew kettle. As we will be brewing on Saturday, I decided to calibrate the keg so we know how much wort is in there. I'm posting it in case I lose the paper. Anyway, here's the calibration (height from 16" is the grade it reaches when holding a tape measure/yardstick with the top of the keg at 16"):

Height Height
Gallon (middle) (from 16")
------ ------ ------
1 2 --
2 3.25 1
3 4.5 2.25
4 5.75 3.5
5 7 4.75
6 8.25 6
7 9.5 7.25
8 10.75 8.5
9 12 9.75
10 13.25 11
11 14.5 12.25
12 15.75 13.5
13 17 14.75

FYI, there are two rings around the keg: the lower ring is calibration is 5.6 gallons and the higher ring is 10.8 gallons. Anyway, sorry to the two of you who actually read this, as it is pretty much of no use to anybody.