US fluid ounces and tablespoons
The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. Drink cans and bottles, cosmetics and US recipes use fluid ounces. It measures volume, unlike the ounce of weight.
The US tablespoon is half a US fluid ounce: exactly 14.78676478125 milliliters, or 3 teaspoons. Recipes use tablespoons for oil, butter, sauces and spices. Australian tablespoons are 20 mL.
Worked example
Convert 2 fl oz: 2 × 2 = 4, so 2 US fluid ounces is 4 tablespoons. Likewise 5 fl oz = 10 tbsp.
Estimating in your head
The factor is a short exact number, so mental math needs no rounding: multiply by 2.
Going the other way
To convert tablespoons to US fluid ounces, divide by 2 (or multiply by 0.5).
How this works
tbsp = fl oz × 2
1 fl oz = 0.0000295735295625 m³ and 1 tbsp = ≈ 0.00001478676478 m³, both by definition, so the factor is their ratio: 2 exactly. Results drop binary floating-point noise beyond 15 significant digits and display at the precision you choose (6 significant figures by default). Copy result copies the full value.
Frequently asked
How many tablespoons are in a US fluid ounce?
1 US fluid ounce = 2 tablespoons, exactly. The value follows from the unit definitions, so it never changes.
How do I convert US fluid ounces to tablespoons?
Multiply by 2. For example, 5 fl oz × 2 = 10 tbsp.
What is 10 fl oz in tablespoons?
10 fl oz = 20 tbsp. The table next to the converter lists more common values.
Is the result rounded?
Only on screen. The page computes with the exact definitions and removes floating-point noise past 15 significant digits; pick 3 to 12 significant figures, or use Copy result for the full value.
Sources
- NIST SP 811 Appendix B.8 — Factors for units listed alphabetically
- NIST Handbook 44 — Appendix C, General tables of units of measurement
- Wikipedia — United States customary units
Reviewed Oct 17, 2026 · test vectors fixtures/units/volume/oz-to-tablespoons/