That depend on how long the ruler is.
The 2 rulers in my desk drawer have 200 and 300 milimeters markings respectively. I also have a triangle with 195 millimeter markings on one side. I just looked in another drawer and found a ruler with 400 mm markinga and a folding carpenter's rule with 2000 markings.
There are 25.4 millimeters to an inch, so there are 304.8 millimeters in a twelve inch ruler.
AS ml are a VOLUME measure, it is impossible to have them on a ruler.
One.
One ml of What?
That is 0.625 ml.
That is 1.573 ml.
There are 1,000 mL in one liter.
30 ml 30 ml
One mL equals 1000µl
One mL is the same as a Cubic Centimeter.
1 ounce is 28.35 ml.
2250 ml
There are 226 ml in 1 cup
That is approximately 248 ml.