How to Convert Teaspoons to US cups (tsp to cup)
Volume conversions help with baking from American recipes, comparing petrol prices quoted per gallon abroad with pump prices per litre here, and reading PUB water bills in cubic metres. This guide shows how to convert teaspoons into us cups by hand, with examples and a quick-reference table.
The conversion
To convert teaspoons to us cups, multiply the value by 0.0208333474. To go the other way, divide by the same number (or multiply by 47.9999675385). For a quick estimate, multiply by about 0.021.
US cups = teaspoons × 0.0208333474
Worked examples
- 3 tsp = 0.0625 cup
- 12.5 tsp = 0.260417 cup
- 75 tsp = 1.5625 cup
Teaspoons to US cups table
| Teaspoons | US cups |
|---|---|
| 1 tsp | 0.020833 cup |
| 2 tsp | 0.041667 cup |
| 5 tsp | 0.104167 cup |
| 10 tsp | 0.208333 cup |
| 20 tsp | 0.416667 cup |
| 25 tsp | 0.520834 cup |
| 50 tsp | 1.0417 cup |
| 100 tsp | 2.0833 cup |
| 250 tsp | 5.2083 cup |
| 500 tsp | 10.4167 cup |
| 1,000 tsp | 20.8333 cup |
Common questions
Is tsp to cup exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the US cups to Teaspoons converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For any value, use the Teaspoons to US cups Converter or browse all volume converters.
Run your own numbers: Teaspoons to US cups Converter