Volume conversion
21 mL to cups
0.089 cups
21 millilitres = 0.089 US cups. Exact factor: cups = mL ÷ 236.5882365.
Live converter
Edit either field — the other updates instantly. Type decimal values like 38.4.
The formula
cups = mL ÷ 236.5882365
Worked example: 21 × 0.0042267528 = 0.089 cups.
Values near 21 mL
| mL | cups |
|---|---|
| 18 | 0.076 |
| 19 | 0.08 |
| 20 | 0.085 |
| 21this page | 0.089 |
| 22 | 0.093 |
| 23 | 0.097 |
| 24 | 0.101 |
Frequently asked
How do you convert millilitres to US cups?
Apply the formula cups = mL ÷ 236.5882365. Enter any value in the live converter above and the result updates as you type.
What is 21 mL in cups?
21 mL equals 0.089 cups. The reference table below shows the values immediately around 21 mL.
Is this conversion exact?
Yes. The US legal cup used on nutrition labels is 240 mL, slightly larger than the 236.59 mL customary cup used in recipes.