Originally Posted by

**nucci93** I know that, but let's say I want to fill it with 4.5oz of water or something. How would I know what height to fill it to? (without cutting it, etc.)

Since I'm from Europe I gotta love the metric system Use the given formula and solve for the unknown variables. I'll walk you through this:

The formula says

Volume = pi/3*h(R^2+R*r+r^2)

We also know that the relationship between the height and the larger radius (top) is

h/R = 3.7/1.6 <=> h = 3.7R/1.6

In this case we then have

Volume = pi/3*h(R^2+R*r+r^2) => 4.5 = pi/3*h(R^2+R*1.1+1.1^2)

You can solve this equation by first using the above given relationship between R and h into this equation. This will give you only h as unknown to solve for.