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Volume
Teaspoons to Fluid ounces
Convert teaspoons (tsp) to fluid ounces (fl oz). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 tsp = 0.166667 fl oz
Teaspoons to Fluid ounces Conversion Table
Common values, ready to copy:
| teaspoons | fluid ounces |
|---|---|
| 1 tsp | 0.166667 fl oz |
| 2 tsp | 0.333334 fl oz |
| 5 tsp | 0.833334 fl oz |
| 10 tsp | 1.6667 fl oz |
| 25 tsp | 4.1667 fl oz |
| 50 tsp | 8.3333 fl oz |
| 100 tsp | 16.6667 fl oz |
| 1,000 tsp | 166.67 fl oz |
Formula
fluid ounces = teaspoons × 1.66666779e-1
Volume conversions use US customary measure (the cup, fluid ounce, and gallon are US definitions, not imperial). 1 US cup = 236.588 mL, 1 US gallon = 3.785411784 L.
About Teaspoons and Fluid ounces
Teaspoons (tsp): Standardized at about 5 mL for cooking purposes; US legal definition is exactly 4.92892 mL, but international cooking convention uses 5 mL even in the US. Common uses: Small cooking measurements (spices, baking powder, vanilla extract), liquid medication dosing for adults (often 1 or 2 teaspoons = 5 or 10 mL).
Fluid ounces (fl oz): 1/128 of a US gallon, or 29.5735 mL; the UK imperial fluid ounce is slightly different at 28.4131 mL, a remnant of pre-metric British measurement. Common uses: US beverage container sizes (a 12-oz soda can), US liquid recipe measurements, and UK pub measures for spirits (where a 'single' is 25 or 35 mL but historically tracked from imperial fl oz).
How the conversion works
Volume conversions use US customary measure (the cup, fluid ounce, and gallon are US definitions, not imperial). 1 US cup = 236.588 mL, 1 US gallon = 3.785411784 L.
The exact relationship is fluid ounces = teaspoons × 1.66666779e-1, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between teaspoons and fluid ounces comes up wherever volume measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.