Milliequivalents per liter to parts per million as CaCO₃
Type a value in meq/L to get it in ppm instantly.
400.3ppm
That's 1.33× as buffered as hard, heavily buffered water — nothing on our list beats it. That is high: stable, but it can drive scale and push the pH up.
Convert the other way: ppm to meq/L
What it means
How well buffered is it?
Alkalinity is reported as calcium carbonate by convention, even though most of it is really bicarbonate. That convention is what makes the units comparable.
The math
How to convert meq/L to ppm
To convert milliequivalents per liter to parts per million as CaCO₃, multiply by 50.0434.
Example: 8 meq/L × 50.0434 = 400.347 ppm.
In the other direction, 1 ppm = 0.0199827 meq/L.
Every unit
Your alkalinity in every unit
Tables
meq/L to ppm conversion table
| meq/L | ppm |
|---|---|
| 10 meq/L | 500.434 ppm |
| 20 meq/L | 1,000.87 ppm |
| 40 meq/L | 2,001.74 ppm |
| 60 meq/L | 3,002.6 ppm |
| 80 meq/L | 4,003.47 ppm |
| 100 meq/L | 5,004.34 ppm |
| 120 meq/L | 6,005.21 ppm |
| 143 meq/L | 7,156.21 ppm |
| 180 meq/L | 9,007.81 ppm |
| 250 meq/L | 12,510.9 ppm |
| 400 meq/L | 20,017.4 ppm |
ppm to meq/L conversion table
| ppm | meq/L |
|---|---|
| 10 ppm | 0.199827 meq/L |
| 20 ppm | 0.399653 meq/L |
| 40 ppm | 0.799306 meq/L |
| 60 ppm | 1.19896 meq/L |
| 80 ppm | 1.59861 meq/L |
| 100 ppm | 1.99827 meq/L |
| 120 ppm | 2.39792 meq/L |
| 143 ppm | 2.85752 meq/L |
| 180 ppm | 3.59688 meq/L |
| 250 ppm | 4.99566 meq/L |
| 400 ppm | 7.99306 meq/L |
Quick answers
Quick answers
- How many ppm is 1 meq/L?
- 1 meq/L is 50.0434 ppm.
- How many ppm is 10 meq/L?
- 10 meq/L is 500.434 ppm.
- How many ppm is 8 meq/L?
- 8 meq/L is 400.347 ppm.
The units
About these units
Milliequivalents per liter (meq/L)
The chemist’s unit, and the one reef chemistry calculates in.
Parts per million as CaCO₃ (ppm)
The water treatment and pool standard.
Keep going