This converter turns teaspoons into imperial fluid ounces instantly, using the exact factor 1 teaspoon = 0.1734737885 imperial fluid ounces. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The smallest standard kitchen measure, 4.93 millilitres. The UK fluid ounce, about 4% smaller than its US counterpart.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
teaspoons- The amount you are converting, measured in teaspoons
0.1734737885- The exact number of imperial fluid ounces in one teaspoon
imperial fluid ounces- The converted result
How it works, step by step
- Enter the number of teaspoons you want to convert.
- The value is multiplied by 0.1734737885, the exact conversion factor.
- The result is displayed in imperial fluid ounces, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 teaspoons
Multiply 5 by 0.17347379. That gives 0.867369 imperial fluid ounces. A quick sanity check: one teaspoon is smaller than one imperial fluid ounce, so the number should get smaller — and it does.
Converting 72 teaspoons
72 × 0.17347379 = 12.4901 imperial fluid ounces. Working backwards, 12.4901 ÷ 0.17347379 returns 72 teaspoons, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many imperial fluid ounces are in one teaspoon?
Exactly 0.1734737885. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert teaspoons to imperial fluid ounces?
Imperial Fluid Ounces = teaspoons × 0.1734737885. To reverse it, divide instead: teaspoons = imperial fluid ounces ÷ 0.1734737885, which is the same as multiplying by 5.764559642.
Is the teaspoon bigger than the imperial fluid ounce?
No. One teaspoon is only 0.173474 of a imperial fluid ounce, so the imperial fluid ounce is the larger unit.
Why does my answer differ slightly from other teaspoons to imperial-fluid-ounces converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a teaspoon?
The smallest standard kitchen measure, 4.93 millilitres.
What is a imperial fluid ounce?
The UK fluid ounce, about 4% smaller than its US counterpart.
Teaspoons to imperial fluid ounces reference table
| Teaspoons | Imperial Fluid Ounces |
|---|---|
| 0.5 tsp | 0.086737 fl oz |
| 1 tsp | 0.173474 fl oz |
| 2 tsp | 0.346948 fl oz |
| 3 tsp | 0.520421 fl oz |
| 5 tsp | 0.867369 fl oz |
| 10 tsp | 1.7347 fl oz |
| 15 tsp | 2.6021 fl oz |
| 20 tsp | 3.4695 fl oz |
| 25 tsp | 4.3368 fl oz |
| 50 tsp | 8.6737 fl oz |
| 75 tsp | 13.0105 fl oz |
| 100 tsp | 17.3474 fl oz |
| 250 tsp | 43.3684 fl oz |
| 500 tsp | 86.7369 fl oz |
| 1000 tsp | 173.4738 fl oz |
Exact factor: 1 teaspoon = 0.1734737885 imperial fluid ounces. Values rounded for display.