Convert teaspoon to ml

Teaspoon (U.S.)

定義
A U.S. customary teaspoon (tsp) is a volume measure equal to 4.9289215938 mL. The “metric teaspoon” used in many nutrition labels and recipes is standardized at 5 mL.

歴史と由来
In the 18th-century Apothecaries’ system, the teaspoon equaled 1 fluid dram, ¼ tablespoon, or ⅛ fluid ounce. Early teacups and spoons were small—reflecting the high cost of tea—so a teaspoon then was smaller than today’s. As tea became affordable in the early 1700s, spoons grew to ⅓ tablespoon, matching the current size ratio.

現代の使用
Teaspoons measure small volumes in cooking (especially baking) and dispense medication. Outside kitchens and pharmacies, metric units like milliliters or liters prevail for volume.

Milliliter

定義
A milliliter (mL) is the metric volume unit equal to 1 cubic centimeter (1 cm³), 0.001 liters, or 1 × 10⁻⁶ m³.

歴史と由来
The milliliter derives from the liter (originally litre in French), once defined by water’s mass. Today it simply reflects the “milli-” prefix—one-thousandth of a cubic decimeter.

現代の使用
Milliliters are ubiquitous for small-volume needs: lab solutions, medicine syringes, condiment bottles, travel toiletries, and nutritional labeling. Precision instruments (pipettes, graduated cylinders) rely on mL graduations.

Teaspoon → Milliliter Conversion Table

変換方法

• 1 tsp US = 4.9289215938 mL

• 1 mL ≈ 0.2028841362 tsp US

例

コンバート 15 tsp US to milliliters:

15 tsp × 4.9289215938 mL/tsp = 73.9338239063 mL