Ppm CaCO₃ to French degrees
Type a value in ppm to get it in °fH instantly.
15°fH
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 °fH
To convert ppm CaCO₃ to French degrees, multiply by 0.1.
Example: 150 ppm × 0.1 = 15 °fH.
In the other direction, 1 °fH = 10 ppm.
Every unit
Your hardness in every unit
Tables
ppm to °fH conversion table
| ppm | °fH |
|---|---|
| 20 ppm | 2 °fH |
| 40 ppm | 4 °fH |
| 60 ppm | 6 °fH |
| 80 ppm | 8 °fH |
| 100 ppm | 10 °fH |
| 120 ppm | 12 °fH |
| 150 ppm | 15 °fH |
| 180 ppm | 18 °fH |
| 200 ppm | 20 °fH |
| 250 ppm | 25 °fH |
| 300 ppm | 30 °fH |
| 400 ppm | 40 °fH |
°fH to ppm conversion table
| °fH | ppm |
|---|---|
| 20 °fH | 200 ppm |
| 40 °fH | 400 ppm |
| 60 °fH | 600 ppm |
| 80 °fH | 800 ppm |
| 100 °fH | 1,000 ppm |
| 120 °fH | 1,200 ppm |
| 150 °fH | 1,500 ppm |
| 180 °fH | 1,800 ppm |
| 200 °fH | 2,000 ppm |
| 250 °fH | 2,500 ppm |
| 300 °fH | 3,000 ppm |
| 400 °fH | 4,000 ppm |
Quick answers
Quick answers
- How many °fH is 1 ppm?
- 1 ppm is 0.1 °fH.
- How many °fH is 10 ppm?
- 10 ppm is 1 °fH.
- How many °fH is 150 ppm?
- 150 ppm is 15 °fH.
The units
About these units
Ppm CaCO₃ (ppm)
Milligrams of calcium carbonate per liter, the unit on most water company reports.
French degrees (°fH)
One French degree is exactly 10 ppm, which makes the arithmetic easy.
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