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KH, GH in PPM?

Just a quickie:  according to the Krib to go from ppm to dH for GH you
divided ppm by 17.8.  It says ppm KH is also measured in equivalent CaCO3.
I assume this means to also divide ppm KH by 17.8 to be able to relate it to
the charts.

In my case I've got GH of about 120ppm (= dH of about 7) and a KH of 100ppm
(= dH of about 6).

pH is just below 7 so this means about 20-25ppm CO2.

I'm running 2W/gal and the plants seem to be doing well.

jtm (newbie)