Convert prescribed milligram (mg) doses into exact liquid volume in milliliters (mL) and calibrated teaspoons using the formula: Volume = Dose ÷ Concentration.
≈ 2.0 Medicinal Teaspoons (5 mL each)
(250 mg ÷ 125 mg) × 5 mL = 10.0 mLWhen calculating liquid medication volume, the formula is:
Volume (mL) = (Dose Desired ÷ Dose on Hand) × Volume on HandWhere:
Prescription: Amoxicillin 400 mg oral suspension three times daily.
Medicine on Hand: 250 mg per 5 mL suspension.
(400 mg ÷ 250 mg) × 5 mL = 8.0 mLAdministration: Draw exactly 8.0 mL into a calibrated oral syringe (equivalent to 1.6 medicinal teaspoons).
Use the universal formula: Volume (mL) = Prescribed Dose (mg) ÷ Concentration (mg/mL). For example, if the doctor prescribes 250 mg and the suspension is 125 mg per 5 mL (which is 25 mg/mL), you calculate: 250 ÷ 25 = 10 mL (or 2 medicinal teaspoons).
In pharmaceutical standards, 1 medicinal teaspoon is strictly standardized to exactly 5.0 mL. Never use tableware silverware spoons, which can vary wildly between 2 mL and 10 mL.
1/2 medicinal teaspoon equals 2.5 mL. 1/4 medicinal teaspoon equals 1.25 mL.
Look on the front of the medicine bottle for numbers followed by "mg/mL" or "mg/5 mL" (for example, "160 mg / 5 mL" on children's acetaminophen, or "250 mg / 5 mL" on amoxicillin).
Convert teaspoons of liquid medication to milligrams.
→SupplementsConvert powders and supplements to milligrams.
→Volume ToolConvert teaspoons to milliliters instantly.
→Reverse ToolConvert milligrams back to teaspoon fractions.
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