* Milliliters (ml) measure volume, which is the amount of space a substance occupies.
* Inches measure length or distance.
Think of it this way: You can't say how many miles are in a gallon, because miles measure distance and gallons measure volume.
To make a conversion, you need to know:
* What are you measuring? If you're trying to find the volume of something that's shaped like a box, you can convert inches to cubic inches (in³) and then convert cubic inches to milliliters.
* What is the shape of the object? The conversion will depend on the shape of the object you're measuring.
Let me know if you have more information about what you're trying to measure, and I can help you figure out the correct conversion!