Various waterjet feed rate calculators are available online. With these calculators, you can play around with the various parameters to see how cutting speed and cost per inch are affected. Below is an example of one such calculator.

With all of these calculators, it is more important to focus on cost per inch (or foot, or meter), rather than cost per hour. Focusing on cost per foot takes into account the diminishing returns discussed in the previous section.

Another thing to keep in mind is that these calculators are only showing straight line cutting speeds. Depending upon part geometry, piercing times, machine design and more, actual part cutting times can vary significantly from just taking the total linear inches of cutting in a part and dividing that number by the inches per minute shown in a calculator. The calculators are useful though in at least getting an idea of speeds and costs.