Oz to Tsp Converter
Convert between US fluid ounces and US teaspoons with the exact 6:1 liquid-volume relationship.
Paste fl oz, fl. oz., fluid ounces, US fluid ounces, tsp, tsp., teaspoons, or US teaspoons. A recognized suffix sets the direction. Bare oz or ounce is rejected because ounces can mean weight.
US fluid ounces to US teaspoons formula
US teaspoons = US fluid ounces × 6. The exact relationship is 1 US fl oz = 6 US tsp. NIST Handbook 44 defines one measuring tablespoon as exactly 3 teaspoons and exactly one-half fluid ounce, which gives the same 6:1 relationship.
Common US fluid ounce to teaspoon values
| US fluid ounces | US teaspoons |
|---|---|
| 0.25 US fl oz | 1.5 US tsp |
| 0.5 US fl oz | 3 US tsp |
| 1 US fl oz | 6 US tsp |
| 2 US fl oz | 12 US tsp |
| 4 US fl oz | 24 US tsp |
| 8 US fl oz | 48 US tsp |
US teaspoons to US fluid ounces
US fluid ounces = US teaspoons ÷ 6. Six US teaspoons equals exactly 1 US fluid ounce. One US teaspoon equals exactly 1/6 US fluid ounce, but its nine-place decimal display is approximately 0.166666667.
Why fl oz matters
A bare oz or ounce suffix is not accepted because ounce can refer to weight. Use fl oz, fluid ounce, or US fluid ounce for liquid volume. The converter also rejects weight units and Imperial, U.K., metric, and FDA measurement labels rather than treating them as US measures.
Frequently asked questions
How many US teaspoons are in one US fluid ounce?
One US fluid ounce equals exactly 6 US teaspoons.
How do I convert US fluid ounces to teaspoons?
Multiply US fluid ounces by 6. For example, 2 US fluid ounces equals 12 US teaspoons.
How do I convert US teaspoons to fluid ounces?
Divide US teaspoons by 6. One US teaspoon is exactly 1/6 US fluid ounce and displays as approximately 0.166666667 US fluid ounces.
Why does the converter reject oz or ounce?
Ounces can describe weight or fluid volume. Enter fl oz or fluid ounce so the US liquid-volume meaning is explicit.
Can I enter fractions?
Yes. Decimal, simple-fraction, mixed-number, and Unicode-fraction inputs are accepted, including 1/2 fl oz, 1 1/2 fl oz, and ½ fl oz.
Does this page support Imperial, metric, or FDA measures?
No. The converter is limited to US fluid ounces and US teaspoons and rejects other measurement systems instead of silently mixing them.