How to do convertion of GH reading to a single digits

[goody992828]

Hi

Can someone help me on my query on how to convert GH reading.

example like

GH = 5 how to convert it to PPM?

or if my GH values is 240ppm how does it covert to a single digit just like example above???

[silane]

1 dGH = 17.9ppm

[goody992828]

1 dGH = 17.9ppm

Hi Silane

Thanks for the help