21 Cup (US) to Teaspoon (UK)
Quick answer
21 Cup (US) (cup) equals
839.335578 tsp (UK)
To convert 21 Cup (US)s to Teaspoon (UK)s, multiply by 39.9683608622. Therefore, 21 Cup (US) (cup) equals 839.335578 Teaspoon (UK) (tsp (UK)).
Formula: tsp (UK) = cup × 39.9683608622. Calculation: 21 × 39.9683608622 = 839.335578 tsp (UK).
Convert Cup (US) (cup) to Teaspoon (UK) (tsp (UK)) online with our free unit converter. In volume, 1 cup = 39.968361 tsp (UK). Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Cup (US) to Teaspoon (UK)
- Step 1 — start with the formula. tsp (UK) = cup × 39.9683608622
- Step 2 — substitute your figure. 21 cup × 39.9683608622
- Step 3 — read the result. 21 cup = 839.335578 tsp (UK)
- Step 4 — check it in reverse. cup = tsp (UK) × 0.0250197901 returns 21 cup, which matches the figure you started with.
Volume Converter
40 units available
21 cup = 839.335578 tsp (UK)
Formula:
tsp (UK) = cup × 39.9683608622With your value: 21 cup = 839.33557811 tsp (UK)
How big is that?
Everyday references on a logarithmic scale, all expressed in cup (us) so you can sanity-check the result.
Other Cup (US) to Teaspoon (UK) conversions
Cup (US) to Teaspoon (UK) Conversion Table
| Cup (US) (cup) | Teaspoon (UK) (tsp (UK)) |
|---|---|
| 0.5 | 19.98418 |
| 1 | 39.968361 |
| 2 | 79.936722 |
| 5 | 199.841804 |
| 10 | 399.683609 |
| 15 | 599.525413 |
| 20 | 799.367217 |
| 25 | 999.209022 |
| 50 | 1,998.418043 |
| 100 | 3,996.836086 |
| 250 | 9,992.090216 |
| 500 | 19,984.180431 |
| 1000 | 39,968.360862 |
Teaspoon (UK) to Cup (US) Conversion Table
| Teaspoon (UK) (tsp (UK)) | Cup (US) (cup) |
|---|---|
| 0.5 | 0.01251 |
| 1 | 0.02502 |
| 2 | 0.05004 |
| 5 | 0.125099 |
| 10 | 0.250198 |
| 15 | 0.375297 |
| 20 | 0.500396 |
| 25 | 0.625495 |
| 50 | 1.25099 |
| 100 | 2.501979 |
| 250 | 6.254948 |
| 500 | 12.509895 |
| 1000 | 25.01979 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Cup (US) (cup)
Volume
Derived from the cubic metre. The litre is exactly 10⁻³ m³; US and imperial capacity units are exact multiples fixed by statute.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Teaspoon (UK) (tsp (UK))
Volume
Derived from the cubic metre. The litre is exactly 10⁻³ m³; US and imperial capacity units are exact multiples fixed by statute.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Cup (US) to Teaspoon (UK)
To convert from Cup (US) (cup) to Teaspoon (UK) (tsp (UK)), multiply the value by 39.9683608622.
Formula: tsp (UK) = cup × 39.9683608622
Reverse: cup = tsp (UK) × 0.0250197901
Step-by-Step Example
- Start with your value in Cup (US). For example: 5 cup
- Multiply by the conversion factor: 5 x 39.9683608622
- The result is: 199.841804 tsp (UK)
Cup (US) and Teaspoon (UK) Relationship
Both Cup (US) and Teaspoon (UK) belong to the US Customary / Imperial system, making this an intra-system conversion within volume. Since 1 Cup (US) equals approximately 39.9684 Teaspoon (UK)s, the Cup (US) represents a larger unit interval than the Teaspoon (UK). Understanding the relationship between Cup (US) and Teaspoon (UK) is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Cup (US)
The US cup equals approximately 236.6 mL and is a standard cooking measurement in the United States.
Common uses of Cup (US): baking, cooking, recipes.
About Teaspoon (UK)
The Teaspoon (UK) (symbol: tsp (UK)) is a recognized unit in the US Customary / Imperial measurement framework, utilized within volume applications for precision and standardized data representation.
Common uses of Teaspoon (UK): volume calculations, engineering and science, education.
Frequently Asked Questions
- What is 21 Cup (US) in Teaspoon (UK)?
- 21 Cup (US) equals 839.335578 Teaspoon (UK).
- How many Teaspoon (UK)s are in 1 Cup (US)?
- There are exactly 39.9683608622 Teaspoon (UK)s in 1 Cup (US). This means the conversion factor from Cup (US) to Teaspoon (UK) is 39.9683608622.
- What is the formula to convert Cup (US) to Teaspoon (UK)?
- The formula to convert Cup (US) to Teaspoon (UK) is: tsp (UK) = cup × 39.9683608622. For example, to convert 10 Cup (US)s to Teaspoon (UK)s, you would multiply 10 by 39.9683608622.
- What is a Cup (US)?
- The US cup equals approximately 236.6 mL and is a standard cooking measurement in the United States.
- What is a Teaspoon (UK)?
- The Teaspoon (UK) (symbol: tsp (UK)) is a recognized unit in the US Customary / Imperial measurement framework, utilized within volume applications for precision and standardized data representation.
- What are the common uses of Cup (US)?
- The Cup (US) is commonly used in baking, cooking, recipes.
Related Volume Conversions
Cite this page
UnitConvertLab. (2026). 21 Cup (US) to Teaspoon (UK). UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/21-cup_us-to-teaspoon_uk