Calculating sub box dimensions

Is there a simple mathematical equation to calculate what your subbox dimensions should be.  Expecially if you now some of them like the cu. ft. you know and the minimal hight and width.  I have seen programs on how to build your own box but they seem to be alittle confusing.

Ok so I have a audiobahn 10 inch sub with .15 cub there is no way to get that with those measurements if i was to make the box 10" high and 6 inches deep (the sub only has a mounting depth of 5") the width would have to be like 4.5 inches and thats impossible right?

You are building a sealed enclosure from the enclosures volume specs that you give. Most of audiobahns subs use a volume of around 1 cubic foot. So if you have to go a little bit bigger to make it work . The good thing about a sealed enclosure is that you have room to play with the volume as apposed to a ported one. The calculation dose not has to be exact. You can use the 12volts calculator https://www.the12volt.com/caraudio/boxcalcs.asp#rec  to find a size that will work for you.