This converter turns US cups into teaspoons instantly, using the exact factor 1 US cup = 48 teaspoons. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The US legal cup used in recipes: 240 mL, or 236.6 mL by the customary definition. The smallest standard kitchen measure, 4.93 millilitres.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
US cups- The amount you are converting, measured in US cups
48- The exact number of teaspoons in one US cup
teaspoons- The converted result
How it works, step by step
- Enter the number of US cups you want to convert.
- The value is multiplied by 48, the exact conversion factor.
- The result is displayed in teaspoons, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 US cups
Multiply 5 by 48. That gives 240 teaspoons. A quick sanity check: one US cup is larger than one teaspoon, so the number should get bigger — and it does.
Converting 72 US cups
72 × 48 = 3,456 teaspoons. Working backwards, 3,456 ÷ 48 returns 72 US cups, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many teaspoons are in one US cup?
Exactly 48. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert US cups to teaspoons?
Teaspoons = US cups × 48. To reverse it, divide instead: US cups = teaspoons ÷ 48, which is the same as multiplying by 0.02083333333.
Is the US cup bigger than the teaspoon?
Yes. One US cup equals 48 teaspoons, so it is the larger unit.
Why does my answer differ slightly from other cups to teaspoons converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a US cup?
The US legal cup used in recipes: 240 mL, or 236.6 mL by the customary definition.
What is a teaspoon?
The smallest standard kitchen measure, 4.93 millilitres.
Us Cups to teaspoons reference table
| Us Cups | Teaspoons |
|---|---|
| 0.5 cup | 24 tsp |
| 1 cup | 48 tsp |
| 2 cup | 96 tsp |
| 3 cup | 144 tsp |
| 5 cup | 240 tsp |
| 10 cup | 480 tsp |
| 15 cup | 720 tsp |
| 20 cup | 960 tsp |
| 25 cup | 1,200 tsp |
| 50 cup | 2,400 tsp |
| 75 cup | 3,600 tsp |
| 100 cup | 4,800 tsp |
| 250 cup | 12,000 tsp |
| 500 cup | 24,000 tsp |
| 1000 cup | 48,000 tsp |
Exact factor: 1 US cup = 48 teaspoons. Values rounded for display.