Teaspoon (tsp)

Definition

A US teaspoon, one third of a tablespoon (4.92892159375 milliliters).

History

The teaspoon was originally the spoon used to stir tea and became standardised as a cooking measure at one third of a tablespoon, about 4.93 milliliters in the US.

Where it is used

Teaspoons measure small amounts in recipes and are also used, loosely, for medicine doses.

Typical uses include recipes, medicine doses.

Conversion pages

These pages convert teaspoon to or from another unit in volume.

• Teaspoon to milliliter
• Tablespoon to teaspoon

Other Volume units

• Liter (L)
• Milliliter (mL)
• US gallon (gal)
• US quart (qt)
• US pint (pt)
• US cup (cup)
• US fluid ounce (fl oz)
• Tablespoon (tbsp)
• Cubic meter (m³)
• Cubic foot (ft³)

Sources

• NIST HB 44 NIST Handbook 44, Appendix C §2 (U.S. Customary Units) and §5 (Tables of Equivalents) · Dataset reviewed Nov 11, 2026