How to Convert US cups to Teaspoons (cup to tsp)
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 us cups into teaspoons by hand, with examples and a quick-reference table.
The conversion
To convert us cups to teaspoons, multiply the value by 47.9999675385. To go the other way, divide by the same number (or multiply by 0.0208333474). For a quick estimate, multiply by about 48.
Teaspoons = us cups × 47.9999675385
Worked examples
- 3 cup = 143.9999 tsp
- 12.5 cup = 599.9996 tsp
- 75 cup = 3,600 tsp
US cups to Teaspoons table
| US cups | Teaspoons |
|---|---|
| 1 cup | 48 tsp |
| 2 cup | 95.9999 tsp |
| 5 cup | 239.9998 tsp |
| 10 cup | 479.9997 tsp |
| 20 cup | 959.9994 tsp |
| 25 cup | 1,200 tsp |
| 50 cup | 2,400 tsp |
| 100 cup | 4,800 tsp |
| 250 cup | 11,999.99 tsp |
| 500 cup | 23,999.98 tsp |
| 1,000 cup | 47,999.97 tsp |
Common questions
Is cup to tsp 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 Teaspoons to US cups converter.
Mistakes to avoid
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.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
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
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
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.
For any value, use the US cups to Teaspoons Converter or browse all volume converters.
Run your own numbers: US cups to Teaspoons Converter