Convert US teaspoons to US cups
1 US teaspoon is 0.02 cup. One US teaspoon is exactly 0.0208333333333 US cups.
One US teaspoon is 0.020833333 US cups. To convert US teaspoons to US cups, multiply by 0.020833333; to go the other way, divide by 0.020833333 or multiply by 48. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130. One third of a tablespoon, about 4.93 ml.
Factor checked against the defining standard · How we check
- US teaspoons × 0.020833333
1 * 0.02083330.021 cup
1 US teaspoon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons (as entered) | 1 tsp | — |
| US tablespoons | 0.3333333333 tbsp | × 0.333333333333 |
| US fluid ounces | 0.1666666667 fl oz | × 0.166666666667 |
| US cups | 0.02083333333 cup | × 0.0208333333333 |
| US pints | 0.01041666667 pt | × 0.0104166666667 |
| US quarts | 0.005208333333 qt | × 0.00520833333333 |
| US gallons | 0.001302083333 gal | × 0.00130208333333 |
| milliliters | 4.928921594 ml | × 4.92892159375 |
| liters | 0.004928921594 L | × 0.00492892159375 |
| imperial gallons | 0.001084211178 gal (UK) | × 0.0010842111779 |
| imperial quarts | 0.004336844712 qt (UK) | × 0.00433684471161 |
| imperial pints | 0.008673689423 pt (UK) | × 0.00867368942322 |
| imperial fluid ounces | 0.1734737885 fl oz (UK) | × 0.173473788464 |
| imperial gills | 0.03469475769 gi (UK) | × 0.0346947576929 |
| cubic millimetres | 4,928.921594 mm³ | × 4,928.92159375 |
| cubic centimetres | 4.928921594 cm³ | × 4.92892159375 |
| cubic inches | 0.30078125 in³ | × 0.30078125 |
| cubic feet | 0.0001740632234 ft³ | × 0.00017406322338 |
| cubic yards | 0.000006446786051 yd³ | × 0.0000064467860511 |
| cubic metres | 0.000004928921594 m³ | × 0.00000492892159375 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert US teaspoons to US cups? The converter and the working
- 1.Take the measurement in US teaspoons.
- 2.Multiply by 0.020833333 — that is how many US cups fit in one US teaspoon.
- 3.To go back the other way, divide by 0.020833333, or multiply by 48.
Worked example: 25 US teaspoons to US cups
- Formula
- tsp × 0.020833333 = cup
- Arithmetic
- 25 × 0.020833333 = 0.52 cup
- Answer
- 25 tsp = 0.52 cup
The factor is rounded for display; the figure above is computed from the full value.
US teaspoons to US cups conversion table
| US teaspoons | US cups |
|---|---|
| 1 tsp | 0.02 cup |
| 2 tsp | 0.04 cup |
| 3 tsp | 0.06 cup |
| 4 tsp | 0.08 cup |
| 5 tsp | 0.1 cup |
| 6 tsp | 0.12 cup |
| 7 tsp | 0.15 cup |
| 8 tsp | 0.17 cup |
| 9 tsp | 0.19 cup |
| 10 tsp | 0.21 cup |
| 12 tsp | 0.25 cup |
| 15 tsp | 0.31 cup |
| 20 tsp | 0.42 cup |
| 25 tsp | 0.52 cup |
| 50 tsp | 1.04 cup |
| 100 tsp | 2.08 cup |
| 200 tsp | 4.17 cup |
| 300 tsp | 6.25 cup |
| 500 tsp | 10.42 cup |
| 1000 tsp | 20.83 cup |
| 2000 tsp | 41.67 cup |
| 5000 tsp | 104.17 cup |
| 10000 tsp | 208.33 cup |
The teaspoon on a nutrition label is exactly 5 ml; the one in the drawer is not
The US customary teaspoon is 4.92892159375 ml and the US customary cup is 236.5882365 ml, so a cup is 48 teaspoons. Food labelling rounds both: 21 CFR sets the labelling teaspoon at 5 ml and the labelling cup at 240 ml. A metric cup, in Australia and New Zealand, is 250 ml, and a Japanese cup is 200 ml. For salt and leavening in a small batch the difference is enough to notice.
21 CFR 101.9(b)(5) — Nutrition labelling of food, household measures
What is a US teaspoon?
One third of a tablespoon, about 4.93 ml. A metric teaspoon is a round 5 ml, which is why recipes rarely notice the difference.
What is a US cup?
Eight US fluid ounces, about 236.6 ml. The "legal" cup on nutrition labels is a rounded 240 ml.
How many US cups are in a US teaspoon?
One US teaspoon is 0.020833333 US cups. Going the other way, one US cup is 48 US teaspoons. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US teaspoon.
Cite this page
- APA
- Rule Calculator. (2026). Convert US teaspoons to US cups. Rule Calculator. https://rulecalculators.com/convert/teaspoon-to-cup
- MLA
- "Convert US teaspoons to US cups." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/teaspoon-to-cup.
- Chicago
- Rule Calculator. "Convert US teaspoons to US cups." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/teaspoon-to-cup.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many US cups are in a US teaspoon?
- 0.020833333. Eight US fluid ounces, about 236.6 ml. The "legal" cup on nutrition labels is a rounded 240 ml.
- How do I convert US cups back to US teaspoons?
- Divide by 0.020833333, or multiply by 48 — they are the same operation.
Other volume conversions
US cups to US teaspoons — the same conversion the other way.