mEq To mg Calculator (+ Potassium Cloride, Calcium Gluconate Examples)

Let’s learn how to convert mEq to mg (milliEquivalents to milligrams). We will explain exactly how this conversion works for electrolytes (including potassium chloride (KCl), calcium gluconate (C12H22CaO14) examples). You will get these 3 key tools you can freely use:

  1. mEq to mg calculator. Here, you insert mEq, the atomic weight of the main atom (K in KCl, Ca in calcium gluconate), and ion charge (K=1, Na=1, Ca=2, Mg=2, etc.), and you will get the conversion to mg right away.
  2. mEq to mg formula. We will look at the equation that convert mEq to mg, and solve an example of 20 mEq potassium chloride to mg using this equation.
  3. mEq to mg conversion charts. We converted 1-1000 mEq to mg for potassium chloride and calcium gluconate, and summarized all the results in 2 neat conversion chart.
  4. Appendix: Nobody knows the atomic weights of atoms by heart (ion charges are easier). To help you out, we prepared a table with atomic weights (K, Na, Ca, Mg, Fe, S, etc.,) and ion charges (you will find this table at the end) that will help you use the calculator.

Quick Example: We have a 100 mEq of potassium chloride (KCl). How many mg of potassium are in these 100 mEq? K (potassium) has an atomic weight of 39.1 g/mol, and is 1-valent ion in KCl (K+). We use the formula or simply use the calculator below (mg = 100 mEq × 39.1 g/mol  / 1 = 3910 mg) and see that 100 mEq of potassium (in KCl) equal to 3910 mg of potassium.

Note: We will explain the conversion step-by-step using the calculator and the conversion charts. If you need a bit of help, you are always welcome to use the comment section below, give us a few numbers and chemical substance, and we will help you out with the math.

Let’s start with the online mEq to mg calculator, and the proceed with the formula and, most importantly, look at the 2 conversion charts that are super useful. Here is the calculator:


Alright, let’s have a look at one example to illustrate how this calculator works: How many mg of potassium is in 40 mEq of potassium chloride (KCL)?

We input ’40’ in the mEq field, check this atomic weight table and see that potassium (K) has 39.1 g/mol atomic weight, slide the 1st atomic weight slider to ‘39.1’, from the same table we also see that the ion charge of potassium is 1, thus slide the 2nd slider to ‘1’, and we get this result (screenshot):

converting 40 meq potassium chloride to mg with an online calculator

We can see that 40 mEq of potassium chloride (KCl) contains 1564 mg of potassium (K).

Let’s have a look at the math behind these conversions:

mEq To mg Formula

The equation that allows us to calculate how many mg of a certain chemical substances are in any number of milliequivalents (mEq) is fairly simple:

mg = mEq × Atomic Weight Of Main Atom / Ion Charge

Namely, to calculate weight in mg from mEq, we have to multiply mEq by the atomic weight of the main atom (K is KCl and Ca for calcium gluconate, for example) and divide the product by ion charge (K has a 1 ion charge, calcium has 2 ion charge, iron has 3 ion charge, etc.).

As promised, let’s use this mEq to mg formula to convert 20 mEq potassium chloride to mg. From the appendix table at the bottom of this article, we see that potassium (K) has a 39.1 g/mol atomic weight and it has an ion charge of 1. Let’s put these numbers in the equation like this (with the result):


mg (20 mEq Potassium Chloride) = 20 mEq × 39.1 g/mol / 1 = 782 mg

We see that 20 mEq of potassium chloride contains 782 mg of potassium.

This is just one example. We converted 1-1000 mEq to mg for potassium chloride (KCl) and calcium gluconate (C12H22CaO14), and summarized the results in 2 conversion charts.

Let’s first look at the potassium chloride mEq to mg chart, and then at a similar calcium gluconate chart:

Potassium Chloride mEq To mg Chart

Potassium Chloride mEq (KCL): mg of Potassium (K):
1 mEq Potassium Chloride 39 mg
2 mEq Potassium Chloride 78 mg
3 mEq Potassium Chloride 117 mg
4 mEq Potassium Chloride 156 mg
5 mEq Potassium Chloride 196 mg
10 mEq Potassium Chloride 391 mg
20 mEq Potassium Chloride 782 mg
30 mEq Potassium Chloride 1173 mg
40 mEq Potassium Chloride 1564 mg
50 mEq Potassium Chloride 1955 mg
60 mEq Potassium Chloride 2346 mg
70 mEq Potassium Chloride 2737 mg
80 mEq Potassium Chloride 3128 mg
90 mEq Potassium Chloride 3519 mg
100 mEq Potassium Chloride 3910 mg
150 mEq Potassium Chloride 5865 mg
200 mEq Potassium Chloride 7820 mg
250 mEq Potassium Chloride 9775 mg
300 mEq Potassium Chloride 11,730 mg
350 mEq Potassium Chloride 13,685 mg
400 mEq Potassium Chloride 15,640 mg
450 mEq Potassium Chloride 17,595 mg
500 mEq Potassium Chloride 19,550 mg
600 mEq Potassium Chloride 23,460 mg
700 mEq Potassium Chloride 27,370 mg
800 mEq Potassium Chloride 31,280 mg
900 mEq Potassium Chloride 35,190 mg
1000 mEq Potassium Chloride 39,100 mg

Right away, we can see that 1 mEq of potassium chloride contains 39 mg of potassium.

10 mEq of potassium chloride contains 391 mg of potassium (not 390 mg; the difference comes from rounding).

When we go towards 1000 mEq of potassium chloride, we can see that potassium content comes close to 40 g (39,100 mg, to be specific).

Let’s have a look at a similar conversion chart for calcium gluconate:

Calcium Gluconate mEq To mg Chart

With calcium gluconate, we have to be a bit more careful. Calcium has a 40.08 g/mol atomic weight, but the key here is that it has an ion charge of 2 (not 1 like potassium chloride). Here is the full conversion chart:

Calcium Gluconate mEq (C12H22CaO14) : mg of Calcium (Ca):
1 mEq Calcium Gluconate 20 mg
2 mEq Calcium Gluconate 40 mg
3 mEq Calcium Gluconate 60 mg
4 mEq Calcium Gluconate 80 mg
5 mEq Calcium Gluconate 100 mg
10 mEq Calcium Gluconate 200 mg
20 mEq Calcium Gluconate 401 mg
30 mEq Calcium Gluconate 601 mg
40 mEq Calcium Gluconate 802 mg
50 mEq Calcium Gluconate 1002 mg
60 mEq Calcium Gluconate 1202 mg
70 mEq Calcium Gluconate 1403 mg
80 mEq Calcium Gluconate 1603 mg
90 mEq Calcium Gluconate 1804 mg
100 mEq Calcium Gluconate 2004 mg
150 mEq Calcium Gluconate 3006 mg
200 mEq Calcium Gluconate 4008 mg
250 mEq Calcium Gluconate 5010 mg
300 mEq Calcium Gluconate 6012 mg
350 mEq Calcium Gluconate 7014 mg
400 mEq Calcium Gluconate 8016 mg
450 mEq Calcium Gluconate 9018 mg
500 mEq Calcium Gluconate 10,020 mg
600 mEq Calcium Gluconate 12,024 mg
700 mEq Calcium Gluconate 14,028 mg
800 mEq Calcium Gluconate 16,032 mg
900 mEq Calcium Gluconate 18,036 mg
1000 mEq Calcium Gluconate 20,040 mg

We see that 1 mEq of calcium gluconate contains 20 mg of calcium. 1000 mEq, on the end of the chart, contains more than 20 g of calcium gluconate (20,040 mg, to be exact).

Here is the promised appendix table with atomic weights and ion charges that will help you use the calculator:

Appendix: Atomic Weight Table With Ion Valence

Main Atom: Atomic Weight: Valence (Ion Charge):
K (Potassium) 39.1 g/mol 1
Na (Sodium) 23.0 g/mol 1
Li (Lithium) 6.94 g/mol 1
Ca (Calcium) 40.08 g/mol 2
Mg (Magnesium) 24.3 g/mol 2
Fe (Iron 3-valent): 55.85 g/mol 3
Cu (Copper 2-valent): 63.55 g/mol 2
Zn (zinc 2-valent): 65.38 g/mol 2
F (Fluoride): 19.0 g/mol 1
Cl (Chloride): 25.45 g/mol 1
Br (Bromide): 79.9 g/mol 1
O (Oxide): 16.0 g/mol 2
S (Sulfur): 32.07 g/mol 2
P (Phosphor): 30.97 g/mol 3
N (Nitrogen): 16.0 g/mol 3
C (Carbon): 12.0 g/mol 4

We hope that using the calculator, formula, and these charts, you will be able to convert any mEq to mg. If you need our help with the conversion, you can use the comment section below, tells us about your problem, and we can help you out as best we can.

Disclaimer: Despite our best efforts to be as exact as possible, there is always a possibility for errors. Please do take these calculations as mere informational content, and consult with appropriate specialists for any and all real-life applications.

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