Ppm CaCO₃ to millimoles per liter
Type a value in ppm to get it in mmol/L instantly.
1.499mmol/L
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.
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 mmol/L
To convert ppm CaCO₃ to millimoles per liter, multiply by 0.00999101.
Example: 150 ppm × 0.00999101 = 1.49865 mmol/L.
In the other direction, 1 mmol/L = 100.09 ppm.
Every unit
Your hardness in every unit
Tables
ppm to mmol/L conversion table
| ppm | mmol/L |
|---|---|
| 20 ppm | 0.19982 mmol/L |
| 40 ppm | 0.39964 mmol/L |
| 60 ppm | 0.59946 mmol/L |
| 80 ppm | 0.799281 mmol/L |
| 100 ppm | 0.999101 mmol/L |
| 120 ppm | 1.19892 mmol/L |
| 150 ppm | 1.49865 mmol/L |
| 180 ppm | 1.79838 mmol/L |
| 200 ppm | 1.9982 mmol/L |
| 250 ppm | 2.49775 mmol/L |
| 300 ppm | 2.9973 mmol/L |
| 400 ppm | 3.9964 mmol/L |
mmol/L to ppm conversion table
| mmol/L | ppm |
|---|---|
| 20 mmol/L | 2,001.8 ppm |
| 40 mmol/L | 4,003.6 ppm |
| 60 mmol/L | 6,005.4 ppm |
| 80 mmol/L | 8,007.2 ppm |
| 100 mmol/L | 10,009 ppm |
| 120 mmol/L | 12,010.8 ppm |
| 150 mmol/L | 15,013.5 ppm |
| 180 mmol/L | 18,016.2 ppm |
| 200 mmol/L | 20,018 ppm |
| 250 mmol/L | 25,022.5 ppm |
| 300 mmol/L | 30,027 ppm |
| 400 mmol/L | 40,036 ppm |
Quick answers
Quick answers
- How many mmol/L is 1 ppm?
- 1 ppm is 0.00999101 mmol/L.
- How many mmol/L is 10 ppm?
- 10 ppm is 0.0999101 mmol/L.
- How many mmol/L is 150 ppm?
- 150 ppm is 1.49865 mmol/L.
The units
About these units
Ppm CaCO₃ (ppm)
Milligrams of calcium carbonate per liter, the unit on most water company reports.
Millimoles per liter (mmol/L)
The chemist’s form: one mmol/L of calcium carbonate is 100 ppm.
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