Parts per million to grains per gallon
Type a value in ppm to get it in gpg instantly.
29.21gpg
That's about the same as the drinking water guideline. That is ordinary tap water, within the usual guidelines.
What it means
How pure is that water?
A TDS meter does not measure solids. It measures conductivity and multiplies, so anything dissolved that does not conduct — sugar, for instance — is invisible to it.
The math
How to convert ppm to gpg
To convert parts per million to grains per gallon, multiply by 0.058418.
Example: 500 ppm × 0.058418 = 29.209 gpg.
In the other direction, 1 gpg = 17.118 ppm.
The table below uses NaCl scale (× 0.5).
Every unit
Your reading in every unit
Tables
ppm to gpg conversion table
| ppm | gpg |
|---|---|
| 10 ppm | 0.58418 gpg |
| 50 ppm | 2.9209 gpg |
| 100 ppm | 5.8418 gpg |
| 250 ppm | 14.6045 gpg |
| 500 ppm | 29.209 gpg |
| 800 ppm | 46.7344 gpg |
| 1,000 ppm | 58.418 gpg |
| 1,500 ppm | 87.6271 gpg |
| 3,000 ppm | 175.254 gpg |
| 10,000 ppm | 584.18 gpg |
| 35,000 ppm | 2,044.63 gpg |
gpg to ppm conversion table
| gpg | ppm |
|---|---|
| 10 gpg | 171.18 ppm |
| 50 gpg | 855.9 ppm |
| 100 gpg | 1,711.8 ppm |
| 250 gpg | 4,279.5 ppm |
| 500 gpg | 8,559 ppm |
| 800 gpg | 13,694.4 ppm |
| 1,000 gpg | 17,118 ppm |
| 1,500 gpg | 25,677 ppm |
| 3,000 gpg | 51,354 ppm |
| 10,000 gpg | 171,180 ppm |
| 35,000 gpg | 599,130 ppm |
Quick answers
Quick answers
- How many gpg is 1 ppm?
- 1 ppm is 0.058418 gpg.
- How many gpg is 10 ppm?
- 10 ppm is 0.58418 gpg.
- How many gpg is 500 ppm?
- 500 ppm is 29.209 gpg.
The units
About these units
Parts per million (ppm)
Total dissolved solids, as a TDS meter reports it.
Grains per gallon (gpg)
The US water-treatment unit, also used for hardness.
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