What is 28 75mm on canon aps c in full frame?

28-75mm on APS-C (Canon) gives the view of 45-120mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 57-152mm
• Full frame: 45-120mm
• APS-C: 30-80mm
• APS-C (Canon) (yours): 28-75mm
• Micro Four Thirds: 22-60mm
• 1-inch: 17-44mm
• 1/1.3-inch: 12-33mm
• 1/1.7-inch: 9.7-26mm
• 1/2.3-inch: 8-21mm

Crop factors are by the sensor diagonal, rounded as they're usually quoted; a format with a different shape (4:3 against 3:2) frames a little differently across the width. More in the focal length converter.

Computed from the sensor sizes, not written by a model.