Ppm CaCO₃ to grains per gallon
Type a value in ppm to get it in gpg instantly.
8.763gpg
That's 1.67× as hard as moderately hard water, while hard water is 1.2× harder. That counts as hard water: expect limescale in kettles and showers.
Convert the other way: gpg to ppm
What it means
How hard is that water?
All scales measure the same thing, calcium carbonate content, just with different sized degrees.
The math
How to convert ppm to gpg
To convert ppm CaCO₃ to grains per gallon, multiply by 0.058418.
Example: 150 ppm × 0.058418 = 8.76271 gpg.
In the other direction, 1 gpg = 17.118 ppm.
Every unit
Your hardness in every unit
Tables
ppm to gpg conversion table
| ppm | gpg |
|---|---|
| 20 ppm | 1.16836 gpg |
| 40 ppm | 2.33672 gpg |
| 60 ppm | 3.50508 gpg |
| 80 ppm | 4.67344 gpg |
| 100 ppm | 5.8418 gpg |
| 120 ppm | 7.01016 gpg |
| 150 ppm | 8.76271 gpg |
| 180 ppm | 10.5152 gpg |
| 200 ppm | 11.6836 gpg |
| 250 ppm | 14.6045 gpg |
| 300 ppm | 17.5254 gpg |
| 400 ppm | 23.3672 gpg |
gpg to ppm conversion table
| gpg | ppm |
|---|---|
| 20 gpg | 342.36 ppm |
| 40 gpg | 684.72 ppm |
| 60 gpg | 1,027.08 ppm |
| 80 gpg | 1,369.44 ppm |
| 100 gpg | 1,711.8 ppm |
| 120 gpg | 2,054.16 ppm |
| 150 gpg | 2,567.7 ppm |
| 180 gpg | 3,081.24 ppm |
| 200 gpg | 3,423.6 ppm |
| 250 gpg | 4,279.5 ppm |
| 300 gpg | 5,135.4 ppm |
| 400 gpg | 6,847.2 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 150 ppm?
- 150 ppm is 8.76271 gpg.
The units
About these units
Ppm CaCO₃ (ppm)
Milligrams of calcium carbonate per liter, the unit on most water company reports.
Grains per gallon (gpg)
Grains of calcium carbonate per US gallon, the unit American water softeners are set in.
Keep going