I wouldn't worry too much about the ppm so long as you know your dKH and dGH. For reference though, you can multiply 17.86 by your degree reading to find out the ppm.
For example: When testing my KH, it took 12 drops to change the color of the solution. This puts my dKH at 12, or 214.32 ppm. Same with GH... 12 drops so my dGH is 12, or 214.32 ppm.