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mg, mEq, and mmol Conversion Calculator

 

mg, mEq and mmol Calculator
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mg, mEq and mmol Conversion Calculator
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Example 1:

mg to mEq: Convert 750 mg of KCl (MW = 74.5 mg/mmol, valence = 1) to mEq = 10.07 mEq

Example 2:

mg to mEq: Convert 30 mg of calcium (Ca++) (atomic weight = 40.08 mg/mmol, valence = 2) to mEq = 1.5 mEq

Example 3:

mg to mmol: Convert 100 mg of phosphorus (P) (atomic weight = 31 mg/mmol) to mmol = 3.23 mmol

 

Valences and Atomic Weights for Some Important Ions

Cations Formula Valence Atomic Weight, mg/mmol
Aluminum Al+++ 3 26.982
Ammonium NH4+ 1 18.039
Calcium Ca++ 2 40.078
Ferric Fe+++ 3 55.845
Ferrous Fe++ 2 55.845
Lithium Li+ 1 6.94
Magnesium Mg++ 2 24.305
Phosphorus P 3, 5 30.974
Potassium K+ 1 39.098
Sodium Na+ 1 22.990
Sulfur S -2, +2, +4, +6 32.06

 

Anions Formula Valence Atomic Weight, mg/mmol
Acetate CH3COO- 1 59.044
Bicarbonate HCO3- 1 61.016
Carbonate CO3-- 2 60.008
Chloride Cl- 1 35.45
Citrate C6H5O7--- 3 189.099
Gluconate C6H11O7- 1 195.147
Lactate C3H5O3- 1 89.07
Oxygen O-- 2 15.999
Phosphate H2PO4- 1 96.986
Sulfate SO4-- 2 96.056

 

Valences and Molecular Weights for Common Drugs

Drugs Formula Molecular Weight, mg/mmol Valence Quantity/Unit
Calcium chloride (10%) injection solution CaCl2•2H2O (dihydrate) 147.008 2 (Ca++)
1 mL of solution

= 100 mg of cacium chloride, dihydrate

= 27.26 mg Ca++

= 1.4 mEq of Ca++

= 1.4 mEq of Cl-
Calcium gluconate (10%) injection solution C12H22CaO14 430.38 2 (Ca++)
1 mL of solution

= 94 mg of calcium gluconate + 4.5 mg of calcium saccharate (tetrahydrate)

= 9.3 mg of elemental Ca++

= 0.465 mEq Ca++
Magnesium chloride oral tablets MgCl2(H2O)7 203.31 2 (Mg++) 1 g magnesium chloride

= 119.55 mg
of elemental Mg++

= 9.84 mEq Mg++

= 4.92 mmol Mg++
Magnesium chloride injection MgCl2•6H2O 203.295 2 (Mg++)

1 mL of solution

= 200 mg of magnesium chloride hexahydrate

= 9 mg of sodium chloride

= 1.97 mEq of Mg++

= 1.97 mEq Cl--

Magnesium citrate oral solution Mg3(C6H5O7)2 451.1144 2 (Mg++) 30 mL of solution

= 1.745 g of magnesium citrate

= 282.05 mg elemental magnesium

= 23.21 mEq Mg++

= 11.61 mmol Mg++


1 g = 161.633 mg of elemental Mg++
Magnesium oxide oral tablets MgO 40.304 2 (Mg++) 400 mg

= 241.216 mg
of elemental Mg++

= 19.85 mEq Mg++

= 19.85 mEq O--
Magnesium sulfate injection (50%) solution MgSO4•7H2O (heptahydrate) 246.47 (heptahydrate)

120.36 (anhydrous, MgSO4)

24.305 Mg++
2 (Mg++)
1 mL of solution

= 500 mg of magnesium sulfate heptahydrate solution

= 244.17 mg magnesium anhydrous, MgSO4

= 49.31 mg Mg++

= 4.06 mEq Mg++

= 2.03 mmol magnesium sulfate anhydrous, MgSO4

= 4.06 mOsmol
Potassium acetate injection solution CH3COOK 98.142 1 (K+)
1 mL of solution

= 196.5 mg of potassium acetate

= 2 mEq of potassium K+

= 2 mEq of acetate (CH3COO-)
Potassium bicarbonate (K-LYTE, EFFER-K) oral tablets KHCO3 100 1 (K+)
1 tablet

= 2.4 g potassium bicarbonate

= 25 mEq of potassium
Potassium chloride injection, concentrate KCl 74.548 1 (K+) 1 mL

= 149 mg of KCl

= 2 mEq of K+

= 4 mOsmol
Potassium chloride (K-DUR) oral tablets KCl 74.548 1 (K+)
750 mg of KCl tablet

= 393.35 mg of elemental K+

= 10 mEq of K+
Potassium citrate (UROCIT-K) oral tablets K3C6H5O7•H2O 324.408 1 (K+)
1 tablet

= 540 mg


= 195.24 mg of elemental K+

= 5 mEq of K+
Potassium phosphates injection solution KH2PO4 (monobasic)

K2HPO4 (dibasic)
136.086 (monobasic)
(contains 31 mg P + 39.1 mg K+)

174.2 (dibasic) (contains 31 mg P + 78.2 mg K+)
1 (K+)

3 (PO4---)
1 mL of solution

= 224 mg of potassium phosphate monobasic anhydrous + 236 mg of potassium phosphate dibasic anhydrous

= 170.3 mg (4.4 mEq) of K+

= 93 mg (3 mmol) of phosphorus P
Potassium phosphate and sodium phosphate (PHOS-NaK) oral powder K2HPO4 (dibasic potassium phosphate, MW = 174.18)


KH2PO4 (monobasic potassium phosphate, MW = 136.086)

Na2HPO4 (dibasic sodium phosphate MW = 141.96)

NaH2PO4 (monobasic sodium phosphate, MW = 119.98)
174.18 (K2HPO4)

136.086 (KH2PO4)

141.96 (Na2HPO4)

119.98 (NaH2PO4)
1 (K+)
1 packet

= 1.5 g


= 280 mg (7.1 mEq) K+

= 160 mg (6.9 mEq) Na+

= 250 mg (8 mmol) phosphorus P (1 mmol P = 31 mg)
Sodium acetate injection solution C2H3NaO2 82.03 1 (Na+)
1 mL

= 164 mg
sodium acetate anhydrous

= 2 mEq sodium Na+

= 2 mEq acetate (CH3COO-)
Sodium bicarbonate (8.4%) injection solution NaHCO3 84.0066 1 (Na+)
1 mL

= 84 mg
sodium bicarbonate (NaHCO3)

= 1 mEq Na+

= 1 mEq HCO3-

= 2 mOsmol
Sodium chloride oral tablets NaCl 58.44 1 (Na+)
1 tablet

= 1000 mg

= 393 mg (17.09 mEq)
Na+ + 607 mg Cl-
Sodium chloride (23.4%) injection, concentrate NaCl 58.44 1 (Na+)
1 mL

= 234 mg
NaCl

= 4 mEq
Na+

= 4 mEq
Cl-

= 8.008 mOsmol
Sodium phosphates injection solution NaH2PO4•H2O (monobasic sodium phosphate)

Na2HPO4 (dibasic sodium phosphate)
137.995 (NaH2PO4•H2O)

141.96 (Na2HPO4)
1 (Na+)
1 mL

= 276 mg of
monobasic sodium phosphate, monohydrate

142 mg of dibasic sodium
phosphate, anhydrous

= 92 mg Na+ (4 mEq)

= 93 mg (3 mM) of phosphorus P (1 mmol of P = 31 mg)

= 7 mOsmol

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Rev 10/18