With the camera set to it's highest quality setting the ratio is about 1:4.
You would be able to record about 4x more JPEG files than Raw files.
Tutorials – The RAW File Format
Image file size varies with image content.
A photo of a blank wall will be a smaller image file than a photo of the same wall with art work hanging on the wall and some furniture in the shot.
The number of images (JPEG or Raw) your memory card has room left for that is displayed on your camera is an
approximation.
FWIW -JPEG is an acronym for an image file format developed by the
Joint Photographic Experts Group. So the whole thing gets capitalized - JPEG
Raw is not an acronym, so it's
Raw, not RAW.
There are over 100 Raw image file types - CR2, 3FR, ARI, PEF, CRW, PTX, MEF, DNG, X3F, yada, yada, yada.
Nikon's Raw image file type is NEF - Nikon Electronic File.
In fact, each new digital camera Nikon releases has it's own unique NEF file type, which is why it takes Adobe some weeks to reverse-engineer each new file type for Adobe Camera Raw.