Convert US Cup to US Teaspoon
Convert us cups to us teaspoons instantly. 1 us cup = 48 us teaspoon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Teaspoon to US Cup converter for the reverse conversion.
Units explained
US Cup
A US customary cup is one sixteenth of a US gallon (236.588 mL).
Standardized for American cooking; distinct from the 240 mL US legal cup and the 250 mL metric cup.
The standard US cooking-volume unit in recipes.
US customary cooking measure.
US Teaspoon
A US teaspoon is one third of a US tablespoon (4.9289 mL).
A standardized small cooking measure.
Used everywhere in US recipes and home dosing.
US cooking measure.
US Cup to US Teaspoon conversion formula
The relationship between us cups and us teaspoons:
To convert us cups to us teaspoons, multiply the value in us cups by 48. To reverse, multiply us teaspoons by 0.0208333333.
How to use this converter
Type a value into the calculator. The result in us teaspoons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Teaspoon to US Cup converter for the reverse direction.
Step-by-step: convert us cups to us teaspoons
- Write down the value in us cups (cup).
- Multiply that value by the factor 48.
- The product is the equivalent value in us teaspoons (tsp).
- To reverse, multiply the us teaspoon value by 0.0208333333.
Worked examples
Example 1 — Convert 1 cup to tsp:
1 × 48 = 48 tsp
Example 2 — Convert 100 cup to tsp:
100 × 48 = 4800 tsp
Real-world example — Plastic-film thickness alternates
A 150-us cup plastic film converts cleanly to us teaspoons — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 cup × 48 = 7200 tsp
Real-world example — Hair-width scale measurements
A 70-us cup measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like us teaspoons for direct comparison across supplier datasheets.
70 cup × 48 = 3360 tsp
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 us cups), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 cup × 48 = 144 tsp
US Cup to US Teaspoon conversion table
Standard reference values for converting us cups to us teaspoons:
| US Cup [cup] | US Teaspoon [tsp] |
|---|---|
| 0.01 | 0.48 |
| 0.1 | 4.8 |
| 1 | 48 |
| 2 | 96 |
| 3 | 144 |
| 4 | 192 |
| 5 | 240 |
| 10 | 480 |
| 20 | 960 |
| 30 | 1440 |
| 40 | 1920 |
| 50 | 2400 |
| 100 | 4800 |
| 500 | 24000 |
| 1000 | 48000 |
Frequently asked questions
How many us teaspoons is 1 us cup?
How do I convert us cups to us teaspoons?
How do I convert us teaspoons back to us cups?
How many us teaspoons is 100 us cups?
Popular volume unit conversions
Convert US Cup to other volume units
Show all US Cup conversions
Metric / SI (8 units)
US Customary (Liquid) (7 units)
Imperial (UK) (4 units)
Cubic (length-derived) (3 units)
Cooking / Culinary (3 units)
Sources & references
Conversion factor (1 cup = 48 tsp) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.