Convert Magnesium Meq/L to Magnesium ppm

What is Magnesium Meq/L and ppm?

Meq/L (milliequivalents per liter): This measures the amount of magnesium ions in water or soil solution, considering their charge.
ppm (parts per million): This measures the concentration of magnesium by weight, like how many milligrams of magnesium are present in one liter of water or one kilogram of soil.

Why convert Meq/L to ppm?

Magnesium is essential for crops, and sometimes your soil or water test results show magnesium in Meq/L. But farmers often need to know the amount in ppm to understand how much magnesium is actually present by weight for fertilization or correction purposes.

How to convert Magnesium Meq/L to ppm?

Understand the relationship:

1 Meq/L means 1 milliequivalent of magnesium ions per liter.
The atomic weight of Magnesium (Mg) is approximately 24 g/mol.
Magnesium has a charge of +2 (because it is Mg²⁺).

Formula:

$ppm Mg=Meq/L Mg\timesAtomic weight of Mg/Valence of Mg\times1000$

Apply numbers:

$ppm Mg=Meq/L Mg\times24/2\times1000$

Since Meq/L already means milliequivalents, and 1 eq = 1000 meq, but here we use the direct formula:

Actually, the simplified formula is:

$ppm Mg=Meq/L Mg\times12$

(Where 12 = 24/ 2)

Example:

If your water has 2 Meq/L of Magnesium:

$ppm Mg=2\times12=24 ppm$

So, 2 Meq/L magnesium equals 24 ppm magnesium.

Summary for Farmer:

Multiply the Magnesium value in Meq/L by 12 to get ppm.
This helps you understand how much actual magnesium (in mg per liter) is available for your plants.

You can find more agriculture conversion calculators here.

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