How can a hardness result be converted from grains per gallon (gpg) to milligrams per liter (mg/L)?

Document ID

Document ID TE781

Version

Version 3.0

Status

Status Published

Published Date

Published Date 08/14/2018
Question
How can a hardness result be converted from grains per gallon (gpg) to milligrams per liter (mg/L)?
Summary
Converting hardness from gpg to mg/L
Answer
Multiply the hardness result in gpg by 17.1 to get mg/L (1 gpg = 17.1 mg/L). For example, a hardness test result of 3 gpg as CaCO3 is equivalent to 51 mg/L as CaCO3, because 3 multiplied by 17.1 equals 51.

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