Convert teaspoons to mL and back. Supports US, metric, and UK teaspoons with quick reference, medicine dosing table, and visual volume indicator.
The teaspoon is the smallest standard cooking measure and one of the most critical — a quarter teaspoon of baking soda can make or break a recipe, and a teaspoon of liquid medicine must be dosed accurately for safety. Like the tablespoon, the teaspoon's exact volume varies by country: 4.93 mL (US), 5 mL (metric), and 5.92 mL (UK imperial), and the difference matters for both cooking precision and medication safety.
This converter handles all three teaspoon standards plus nine additional volume units, provides fractional teaspoon conversions (⅛, ¼, ½, ¾ tsp), includes a visual mL indicator for intuitive scale, and offers a medicine dosing reference table. The drops-per-mL approximation is useful for essential oils, tinctures, and liquid supplement dosing.
For home cooks working with international recipes, parents dosing children's medicine, herbalists measuring tinctures, or laboratory workers pipetting small volumes, this tool provides the precision and context that the teaspoon measurement demands at its small scale.
Teaspoons vary by country (4.93–5.92 mL), and at small scales, a 20% difference matters — especially for medication dosing and baking chemistry. This converter distinguishes all three standards and includes a medicine dosing reference that generic tools lack. Keep these notes focused on your operational context. Tie the context to the calculator’s intended domain. Use this clarification to avoid ambiguous interpretation.
1 US teaspoon = 4.92892 mL ≈ 5 mL 1 metric teaspoon = 5 mL (exact) 1 UK imperial teaspoon = 5.919 mL 3 teaspoons = 1 tablespoon 6 teaspoons = 1 fluid ounce 48 teaspoons = 1 cup ≈ 20 drops = 1 mL (standard dropper)
Result: 2.46 mL
0.5 US teaspoons × 4.929 mL/tsp = 2.46 mL. In metric, half a teaspoon is exactly 2.5 mL — close enough for cooking.
Many recipes call for ¼ or ½ teaspoon, and measuring spoon sets include these sizes. For ⅛ teaspoon (a "tad"), ⅙ teaspoon (a "dash"), or 1/16 teaspoon (a "smidgen"), you may need specialized spoons or must estimate by halving.
| Fraction | US mL | Metric mL | Common ingredient example | |---|---|---|---| | ⅛ tsp | 0.62 | 0.625 | Salt for 1 egg | | ¼ tsp | 1.23 | 1.25 | Baking soda per cup of flour | | ½ tsp | 2.46 | 2.5 | Vanilla extract per batch of cookies | | ¾ tsp | 3.70 | 3.75 | Cream of tartar for meringue | | 1 tsp | 4.93 | 5.0 | Baking powder per cup of flour |
The FDA and pediatric organizations recommend NEVER using household spoons for liquid medications. A 2006 study found that household teaspoons delivered 2.5–7.5 mL when attempting to measure 5 mL — errors of up to 50%. Use the calibrated dosing device provided with the medication.
In pharmacy, "one teaspoon" always means 5 mL (the metric teaspoon). Dosing tables, drug labels, and medical guidelines use this standard globally. Cooking teaspoons (US 4.93 mL) are technically smaller, but the difference is clinically insignificant for most medications.
US teaspoon = 4.93 mL, metric = 5 mL, UK imperial = 5.92 mL. Most medicine dosing uses 5 mL as "one teaspoon."
No. Household silverware teaspoons range from 2.5 to 7.5 mL — highly variable. Always use calibrated measuring spoons for cooking and especially for medication.
Approximately 100 drops (at ~20 drops/mL × 5 mL). Drop size varies by dropper and liquid viscosity.
3 teaspoons = 1 tablespoon in both US and metric systems. In Australia, 1 tablespoon = 4 teaspoons (because Australian tbsp = 20 mL).
5 mL is the metric teaspoon — used internationally and for medicine dosing. The US teaspoon is 4.93 mL, but the difference (1.4%) is negligible for most purposes.
⅛ teaspoon ≈ 0.62 mL — about 12 drops. This tiny measure is used for potent spices and baking ingredients.