There is no direct translation between FOV (Field Of View) and Zoom value (or magnification, in other words). In the astronomy lab I used to teach, we had the students focus their classroom telescope first on a parking sign in the distance. I explained to them that magnification was how big a particular letter on the sign was, while Field of View is how many letters can you see.
For a given telescope, the FOV and the magnification are inversely proportional- if you make each letter twice as big, of course you're only going to be able to fit half as many inside your field of view. But for different telescopes, or even different eye pieces that aren't specifically designed to give the same viewing area*, there's no way to compare, other than a general guess that a really big magnification means a really small FOV.
By the way, never ever buy a telescope that has its magnification advertised as its primary selling point. They're selling cheap merchandise gussied up with improper accessories. It's like the Christmas trees that they spraypaint green. Go for light-gathering power, or aperture.
*Viewing area? That means not how many letters can you see in the image, but something more like, can you cover the image with a penny, nickel, or quarter?