Tablespoon to mL: Accurate Medicine Dosing

June 30, 2025 • 4 min read

Many liquid medicines still list doses in tablespoons or teaspoons, but using actual kitchen spoons can lead to significant over- or under-dosing. Here is what you need to know about accurate measurement.

The Standard Conversions

Why Kitchen Spoons Are Dangerous for Medicine

Research has shown that household spoons are unreliable for dosing medicine:

• ▶ Kitchen tablespoons vary from 6 mL to 29 mL depending on the spoon
• ▶ Teaspoons range from 2 mL to 9 mL — nearly double the intended dose at the high end
• ▶ A 2016 study found that 70% of parents made dosing errors when using kitchen spoons
• ▶ The American Academy of Pediatrics recommends only using mL-marked syringes or cups

Safe Dosing Tools

• ▶ Oral syringe: Most accurate (±0.5 mL), best for children and precise doses
• ▶ Dosing cup: Good for adults, read at eye level on a flat surface
• ▶ Dropper: For very small doses (infants), usually marked in mL
• ▶ Medicine spoon: Calibrated spoon with mL markings — better than kitchen spoons but less accurate than syringes

Common Medicine Doses Converted

• ▶ 1/2 teaspoon = 2.5 mL (common infant dose)
• ▶ 1 teaspoon = 5 mL (common children's dose)
• ▶ 2 teaspoons = 10 mL
• ▶ 1 tablespoon = 15 mL (common adult dose for cough syrup)
• ▶ 2 tablespoons = 30 mL (1 fluid ounce)

Tips for Accurate Dosing

• ▶ Always use the measuring device that comes with the medicine — it is calibrated for that specific product
• ▶ Ask your pharmacist for an oral syringe if the medicine does not include one
• ▶ Think in mL — if a doctor says "one teaspoon," confirm whether they mean exactly 5 mL
• ▶ For children: doses are usually calculated by weight (mg per kg), so get the exact mL amount from your pharmacist
• ▶ Never use abbreviations loosely — "tsp" and "tbsp" look similar and a mix-up means a 3x dosing error

When in doubt, always measure in millilitres. It is unambiguous, internationally understood, and the safest way to dose liquid medications accurately.