MyChoice@Firebridge.com.au...

Megapixels	Pixel Resolution	File Size tiff	Print size @ 300 ppi	Print Size @ 200 ppi	Print Size @ 150 ppi	Print Size @ 72 ppi
3	2048 x 1536	9mb	173 x 130 mm 6.82" x 5.12"	260 x 195 mm 10.24" x 7.68"	346 x 260 mm 13.64" x 10.24"	723 x 542 mm 28.45" x 21.33"
4	2464 x 1632	11.5mb	209 x 138 mm 8.21" x 5.44"	313 x 207 mm 12.32" x 8.16"	418 x 276 mm 16.24" x 10.88"	869 x 576 mm 34.22" x 22.67"
6	3008 x 2000	17.2mb	255 x 169 mm 10.02" x 6.67"	382 x 254 mm 15.04" x 10"	510 x 338 mm 20.04 x 13.34"	1061 x 706 mm 41.78" x 27.78"
8	3264 x 2448	22.9mb	276 x 207 mm 10.88" x 8.16"	415 x 311 mm 16.32" x 12.24"	552 x 414 mm 21.76" x 16.32"	1151 x 864 mm 45.33" x 34"
12	4256 x 2832	34.4 mb	362 mm x 240 mm 14.22" x 9.44"	540 x 360 mm 21.28" x 14.16"	724 x 480 mm 28.44" x 18.88"	1501 x 999 mm 59.11" x 39.33"

ppi = pixels per inch
Typical Resolution. Actual pixel dimensions vary from camera to camera.

How big can I go with this image?

You can go as big as you like, but the resolution (amount of information) will determine how far back from the print you need to view it for it to look as you expect.
It is a difficult question to answer as the subject of the image can also affect how large you can print it before it starts to deteriorate in quality.
For prints around A2 (16”x24”) or smaller, anything between 150 and 300dpi is best. The higher the better.
For larger prints, 150dpi is recommended, but 72-80 dpi is usually more than adequate for large backgrounds.

Cropping of images

Cropping will often improve the subject matter,
keep in mind this will reduce pixels in photo thus reducing Ideal print size