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Grains per Gallon (GPG) to PPM

Convert water hardness from GPG to PPM for water treatment.

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Formula: GPG × 17.1206 = ppm
How to use this converter
  1. 1Enter hardness in GPG.
  2. 2PPM appears instantly.
Common questions
Both measure mineral concentration. GPG is used in US water softener industry. PPM is used in pool chemistry. 1 GPG = 17.12 ppm.
Soft: under 1 GPG. Hard: 7-10 GPG. Very hard: over 10 GPG (171+ ppm).
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