21 tsp ≈ 0.4375 cup (Imperial; in US cups: 21 tsp = 0.525416 US cup). To convert teaspoons to cups, multiply by 0.020833344: 21 × 0.020833344 = 0.4375.
How to convert teaspoons to cups
cup = tsp × 0.020833344
- 1 tsp = 0.020833344 cup (and 1 cup = 47.999976 tsp).
- Multiply the amount by the factor: 21 × 0.020833344 = 0.4375.
- Answer: 21 tsp ≈ 0.4375 cup (rounded to 6 significant figures).
Teaspoons to Cups table
| Teaspoons (tsp) | Cups (cup) |
|---|---|
| 16 tsp | 0.333334 cup |
| 17 tsp | 0.354167 cup |
| 18 tsp | 0.375 cup |
| 19 tsp | 0.395834 cup |
| 20 tsp | 0.416667 cup |
| 21 tsp | 0.4375 cup |
| 22 tsp | 0.458334 cup |
| 23 tsp | 0.479167 cup |
| 24 tsp | 0.5 cup |
| 25 tsp | 0.520834 cup |
| 26 tsp | 0.541667 cup |
| tsp | cup |
|---|---|
| 1 tsp | 0.0208333 cup |
| 5 tsp | 0.104167 cup |
| 10 tsp | 0.208333 cup |
| 50 tsp | 1.0417 cup |
| 100 tsp | 2.0833 cup |
| 1,000 tsp | 20.8333 cup |
Good to know
The tsp here is the Imperial (UK) teaspoon: 1 tsp = 0.00591939 L. A US teaspoon is 0.00492892 L.
In US teaspoons: 21 US tsp = 0.364295 cup.
The cup here is the Imperial (UK) cup: 1 cup = 0.28413 L. A US cup is 0.236588 L.
In US cups: 21 tsp = 0.525416 US cup.