Convert Sodium Meq/L to Sodium ppm


What is mEq/L and ppm?

  • mEq/L (milliequivalents per liter) measures the amount of sodium ions based on their chemical charge.
  • ppm (parts per million) or mg/L measures the weight of sodium in a liter of water.

Why convert?

Farmers often test water or soil for sodium content. Some test results give sodium in mEq/L, but fertilizers, guidelines, or other references might use ppm. So, converting helps compare and understand the sodium level correctly.

How to Convert Sodium mEq/L to ppm?

  1. Understand the basic formula:

Sodium (ppm)=Sodium (mEq/L)×Equivalent weight of Sodium (mg/mEq)

  1. Find the equivalent weight of Sodium:
  • Sodium (Na) atomic weight = 23 g/mol
  • Sodium ion charge = +1
  • Equivalent weight = Atomic weight ÷ charge = 23 ÷ 1 = 23 mg/mEq
  1. Final formula:

Sodium (ppm)=Sodium (mEq/L)×23

Example:

If your water sample has 5 mEq/L of Sodium, then:

Sodium (ppm)=5×23=115 ppm

How to use a calculator:

  • Enter the sodium value in mEq/L.
  • Multiply by 23.
  • The result is the sodium concentration in ppm (mg/L).

Summary Table

Sodium (mEq/L) Sodium (ppm) = mEq/L × 23
1 23
2 46
5 115
10 230

You can find more agriculture conversion calculators here.