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US Teaspoons to UK Fluid Ounces (tsp to imp fl oz) Converter

1 US teaspoon (tsp) = 0.173474 UK fluid ounces (imp fl oz). To convert US teaspoons to UK fluid ounces, multiply by 0.173474: 1 tsp × 0.173474 = 0.173474 imp fl oz.

1 tsp = 0.1734737887 imp fl oz
Convert the other way: UK Fluid Ounces to US Teaspoons

Quick facts

How to convert US teaspoons to UK fluid ounces

  1. Take the value in US teaspoons.
  2. Multiply it by 0.173474 (the number of UK fluid ounces in one US teaspoon).
  3. Round the result to the precision you need.
imp fl oz = tsp × 0.173474

Worked example (a recipe): 1 tsp × 0.173474 = 0.173474 imp fl oz.

To convert UK fluid ounces back to US teaspoons, multiply by 5.76456, or divide by 0.173474.

Source: NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units).

US Teaspoons to UK Fluid Ounces conversion table

US Teaspoons to UK Fluid Ounces conversion table
US Teaspoons [tsp]UK Fluid Ounces [imp fl oz]
0.01 tsp0.0017347379 imp fl oz
0.1 tsp0.0173473789 imp fl oz
1 tsp0.1734737887 imp fl oz
2 tsp0.3469475774 imp fl oz
3 tsp0.5204213661 imp fl oz
5 tsp0.8673689434 imp fl oz
10 tsp1.7347378868 imp fl oz
20 tsp3.4694757737 imp fl oz
50 tsp8.6736894342 imp fl oz
100 tsp17.3473788684 imp fl oz
1000 tsp173.4737886843 imp fl oz

tsp to imp fl oz chart from 1 to 100

UK Fluid Ounces to US Teaspoons conversion table

UK Fluid Ounces to US Teaspoons conversion table
UK Fluid Ounces [imp fl oz]US Teaspoons [tsp]
0.01 imp fl oz0.0576455964 tsp
0.1 imp fl oz0.5764559635 tsp
1 imp fl oz5.7645596351 tsp
2 imp fl oz11.5291192702 tsp
3 imp fl oz17.2936789053 tsp
5 imp fl oz28.8227981756 tsp
10 imp fl oz57.6455963511 tsp
20 imp fl oz115.2911927023 tsp
50 imp fl oz288.2279817557 tsp
100 imp fl oz576.4559635114 tsp
1000 imp fl oz5764.5596351137 tsp

US Teaspoons vs UK Fluid Ounces

US TeaspoonUK Fluid Ounce
Symboltspimp fl oz
Equals1 tsp = 0.173474 imp fl oz1 imp fl oz = 5.76456 tsp

What is a US teaspoon?

A US customary cooking measure equal to 1/3 tablespoon. Used in US recipes for small quantities of ingredients.

What is a UK fluid ounce?

A UK imperial unit equal to 1/20 of an imperial pint (exactly 28.4130625 ml). Used in the UK and Canada on older recipes, drinks measures and some bottle labels.

Frequently asked questions

How many UK fluid ounces are in a US teaspoon?

There are 0.173474 UK fluid ounces in 1 US teaspoon (1 tsp = 0.1734737887 imp fl oz).

How many US teaspoons are in a UK fluid ounce?

There are 5.76456 US teaspoons in 1 UK fluid ounce (1 imp fl oz = 5.7645596351 tsp).

How do I convert US teaspoons to UK fluid ounces?

Multiply the number of US teaspoons by 0.173474. For example, 10 tsp × 0.173474 = 1.73474 imp fl oz. To convert back, multiply by 5.76456.

What is 10 tsp in UK fluid ounces?

10 tsp = 1.73474 imp fl oz.

What is 100 tsp in UK fluid ounces?

100 tsp = 17.3474 imp fl oz.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST Handbook 44, Appendix C, and NIST SP 811 (US customary volume units)). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026