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mEq / mL Conversion Table (Strength = 1 mEq/mL)
Formula: mL = mEq / 1 mEq/mL
| mEq to mL | mL to mEq |
| 10 mEq = 10 mL | 1 mL = 1 mEq |
| 25 mEq = 25 mL | 2 mL = 2 mEq |
| 35 mEq = 35 mL | 3 mL = 3 mEq |
| 50 mEq = 50 mL | 4 mL = 4 mEq |
| 60 mEq = 60 mL | 5 mL = 5 mEq |
| 75 mEq = 75 mL | 10 mL = 10 mEq |
| 85 mEq = 85 mL | 15 mL = 15 mEq |
| 100 mEq = 100 mL | 20 mL = 20 mEq |
| 125 mEq = 125 mL | 25 mL = 25 mEq |
| 150 mEq = 150 mL | 30 mL = 30 mEq |
| 175 mEq = 175 mL | 40 mL = 40 mEq |
| 200 mEq = 200 mL | 45 mL = 45 mEq |
| 225 mEq = 225 mL | 50 mL = 50 mEq |
| 250 mEq = 250 mL | 60 mL = 60 mEq |
| 275 mEq = 275 mL | 75 mL = 75 mEq |
| 300 mEq = 300 mL | 85 mL = 85 mEq |
| 350 mEq = 350 mL | 100 mL = 100 mEq |
| 400 mEq = 400 mL | 125 mL = 125 mEq |
| 450 mEq = 450 mL | 150 mL = 150 mEq |
| 500 mEq = 500 mL | 200 mL = 200 mEq |
mEq / mL Conversion Table (Strength = 2 mEq/mL)
Formula: mL = mEq / 2 mEq/mL
| mEq to mL | mL to mEq |
| 5 mEq = 2.5 mL | 1 mL = 2 mEq |
| 7 mEq = 3.5 mL | 1.5 mL = 3 mEq |
| 10 mEq = 5 mL | 2 mL = 4 mEq |
| 12 mEq = 6 mL | 2.5 mL = 5 mEq |
| 15 mEq = 7.5 mL | 3 mL = 6 mEq |
| 17 mEq = 8.5 mL | 3.5 mL = 7 mEq |
| 20 mEq = 10 mL | 4 mL = 8 mEq |
| 22 mEq = 11 mL | 4.5 mL = 9 mEq |
| 25 mEq = 12.5 mL | 5 mL = 10 mEq |
| 27 mEq = 13.5 mL | 6 mL = 12 mEq |
| 30 mEq = 15 mL | 7 mL = 14 mEq |
| 35 mEq = 17.5 mL | 8 mL = 16 mEq |
| 40 mEq = 20 mL | 9 mL = 18 mEq |
| 45 mEq = 22.5 mL | 10 mL = 20 mEq |
| 50 mEq = 25 mL | 11 mL = 22 mEq |
| 55 mEq = 27.5 mL | 12 mL = 24 mEq |
| 60 mEq = 30 mL | 13 mL = 26 mEq |
| 65 mEq = 32.5 mL | 14 mL = 28 mEq |
| 75 mEq = 37.5 mL | 15 mL = 30 mEq |
| 80 mEq = 40 mL | 25 mL = 50 mEq |
Common IV Fluids and Additive Concentrations
| Electrolyte Product | Standard Concentration | Active mEq per mL |
| Potassium Chloride (KCl) | 2 mEq/mL | 2 mEq K⁺ |
| Sodium Bicarbonate (NaHCO₃) | 8.4% | 1 mEq Na⁺ / 1 mEq HCO₃⁻ |
| Sodium Chloride (NaCl) | 23.4% (Hypertonic) | 4 mEq Na⁺ |
| Sodium Chloride (NaCl) | 3% (Hypertonic) | 0.513 mEq Na⁺ |
| Sodium Chloride (NaCl) | 0.9% (Normal Saline) | 0.154 mEq Na⁺ |
| Calcium Gluconate | 10% | 0.465 mEq Ca²⁺ |
| Calcium Chloride (CaCl₂) | 10% | 1.36 mEq Ca²⁺ |
| Magnesium Sulfate (MgSO₄) | 50% | 4 mEq Mg²⁺ |
| Magnesium Sulfate (MgSO₄) | 10% | 0.8 mEq Mg²⁺ |
Molecular Weight and Valence Data
Users need these exact values to operate the % to mEq/mL derivation tab. Providing this data prevents users from leaving your site to search for chemical properties elsewhere.
| Salt / Compound | Chemical Formula | Molecular Weight (MW) | Valence Charge (|z|) |
| Sodium Chloride | NaCl | 58.44 g/mol | 1 |
| Potassium Chloride | KCl | 74.55 g/mol | 1 |
| Sodium Bicarbonate | NaHCO₃ | 84.01 g/mol | 1 |
| Calcium Chloride | CaCl₂ | 110.98 g/mol | 2 |
| Calcium Gluconate | C₁₂H₂₂CaO₁₄ | 430.37 g/mol | 2 |
| Magnesium Sulfate | MgSO₄ | 120.37 g/mol | 2 |
| Sodium Acetate | C₂H₃NaO₂ | 82.03 g/mol | 1 |
Standard Daily Electrolyte Requirements
| Electrolyte | Adult Daily Requirement | Pediatric Daily Requirement |
| Sodium (Na⁺) | 1 to 2 mEq/kg | 2 to 4 mEq/kg |
| Potassium (K⁺) | 1 to 2 mEq/kg | 2 to 3 mEq/kg |
| Calcium (Ca²⁺) | 10 to 15 mEq | 1 to 2.5 mEq/kg |
| Magnesium (Mg²⁺) | 8 to 20 mEq | 0.25 to 0.5 mEq/kg |
| Chloride (Cl⁻) | 2 to 4 mEq/kg | 2 to 4 mEq/kg |
Why You Cannot Convert mEq Directly to mL
You cannot convert milliequivalents (mEq) directly to milliliters (mL) because they measure entirely different physical properties. A milliequivalent measures the chemical activity or combining power of an ion. A milliliter measures the physical volume of a liquid.
To bridge this gap, you must know the concentration of the solution. Concentration acts as the translator between chemical charge and liquid volume. Medical professionals and pharmacists refer to this as the product’s strength, typically expressed as mEq/mL.
Without the strength, any conversion attempt fails. A 40 mEq dose of potassium chloride requires a different liquid volume depending on whether your vial holds 2 mEq/mL or 0.1 mEq/mL. The calculator above prevents this error by forcing you to define the concentration before generating a result.
How to Use the Three Calculator Modules
Module 1: Finding Required Volume (mEq → mL) Use this tab when a physician prescribes a specific electrolyte dose. You input the target dose in mEq and the strength of your available stock. The calculator instantly outputs the exact liquid volume you need to draw into the syringe or add to an IV bag.
Module 2: Finding Delivered Dose (mL → mEq) This tab works in reverse. Use it to determine how much active electrolyte a patient actually received from a known volume of fluid. You enter the administered volume in mL and the fluid’s concentration to calculate the total delivered mEq.
Module 3: Advanced Derivation (% to mEq/mL) Standard drug labels often list concentrations in percentages (like 8.4% NaHCO₃) or mg/mL rather than mEq/mL. This tab translates those commercial formats into a usable mEq/mL strength. You input the label concentration, the molecular weight, and the valence charge of the specific salt to derive the exact equivalent strength.
The Mathematical Formulas
Required Volume Equation
Find the total fluid volume needed for a specific mEq dose:
mL = Prescribed Dose (mEq) ÷ Strength (mEq/mL)
Delivered Dose Equation
Find the total mEq delivered in a known volume of fluid:
mEq = Fluid Volume (mL) × Strength (mEq/mL)
Advanced Derivation Equation
Calculate mEq/mL strength based on a product label percentage:
mEq/mL = (% w/v Label × 10) ÷ (Molecular Weight / Valence |z|)
Demystifying Molecular Weight and Valence
Electrolyte conversions require an understanding of the specific salt’s chemical structure. Physical mass alone does not equal chemical activity.
Molecular weight (MW) represents the sum of the atomic weights of all atoms in a molecule. For example, sodium chloride (NaCl) has a molecular weight of 58.44 g/mol because it combines sodium (22.99) and chlorine (35.45). You must divide the total mass by this specific number to find the millimoles of the substance.
Valence (|z|) measures the absolute electrical charge of the active ion. This multiplier dictates the combining power of the molecule. Sodium (Na+) has a valence of 1, meaning one millimole equals one milliequivalent. Calcium (Ca2+) has a valence of 2, so one millimole yields two milliequivalents, effectively doubling its chemical activity per molecule.
Real-World Pharmacy and Clinical Scenarios
Scenario 1: Preparing a continuous potassium chloride (KCl) infusion. A provider orders a 40 mEq KCl piggyback for a hypokalemic patient. Your pharmacy stocks standard 2 mEq/mL KCl vials. Using the volume equation, you divide the 40 mEq target by the 2 mEq/mL strength. You draw exactly 20 mL from the vial to inject into the primary IV fluid bag.
Scenario 2: Administering sodium bicarbonate during a code. A patient in cardiac arrest requires 50 mEq of sodium bicarbonate. The crash cart contains pre-filled 8.4% NaHCO₃ syringes. As the tool’s derivation module confirms, an 8.4% solution provides exactly 1 mEq/mL. You administer 50 mL of the solution to achieve the ordered dose.
Scenario 3: Calculating calcium gluconate equivalents. A physician prescribes 4.65 mEq of elemental calcium. Your supply consists of 10% calcium gluconate vials. Our built-in derivation logic identifies 10% calcium gluconate as providing roughly 0.465 mEq/mL of active Ca2+. You divide the 4.65 mEq target by 0.465 to extract the precise 10 mL required volume.
Standard Electrolyte Reference Values
- • Potassium Chloride (KCl): 2 mEq/mL
- • Sodium Bicarbonate (NaHCO₃) 8.4%: 1 mEq/mL
- • Sodium Chloride (NaCl) 23.4%: 4 mEq/mL
- • Sodium Chloride (NaCl) 3%: 0.513 mEq/mL
- • Calcium Gluconate 10%: 0.465 mEq/mL Ca2+
- • Calcium Chloride (CaCl₂) 10%: 1.36 mEq/mL Ca2+
- • Magnesium Sulfate (MgSO₄) 50%: 4 mEq/mL Mg2+
Avoiding Common Calculation Errors
Many clinical calculation errors stem from misreading product labels. A 1% solution contains 1 gram per 100 mL, which translates exactly to 10 mg/mL. Never treat a percentage value as a direct milligram equivalent without multiplying by 10 first.
Physicians prescribe calcium by elemental weight or milliequivalents, but pharmacies stock compound salts like calcium gluconate or calcium chloride. Ten percent calcium gluconate yields only about 90 mg of elemental calcium per gram of salt. Always use the specific salt’s molecular weight and valence, as hardcoded in the third module of our tool, rather than the raw compound mass.
Failing to account for the valence charge drastically alters your final dose. Divalent ions like magnesium (Mg2+) and calcium (Ca2+) require you to multiply the millimole count by 2. Forgetting this step cuts the active chemical dose exactly in half.