To convert milliliters to cups (mL to cup), multiply by 0.0042268. 1 milliliter equals 0.0042268 cup, about 20% of a teaspoon.
| milliliters | cups |
|---|---|
| 1 milliliter | 0.0042268 cup |
| 2 milliliters | 0.0084535 cup |
| 5 milliliters | 0.021134 cup |
| 10 milliliters | 0.042268 cup |
| 25 milliliters | 0.10567 cup |
| 50 milliliters | 0.21134 cup |
| 100 milliliters | 0.42268 cup |
| 250 milliliters | 1.0566882 cup |
| 500 milliliters | 2.1133764 cup |
| 1000 milliliters | 4.2267528 cup |
The factor is 0.00422675, which is derived rather than defined, so any decimal you see has been rounded somewhere.
There is no tidy multiplier here, so work the other way: divide by 237 instead. That is the number worth remembering, because 237 milliliters make one cup exactly.
Going the other way, one cup is 237 mL, which is usually the easier direction to work in. Because the forward factor is small, watch the decimal place rather than the digits: a factor-of-ten slip is the common error, not a rounding one.
To anchor the scale: 250 milliliters is about 1.06 cup.