What is 28 70mm on canon aps c in full frame?

28-70mm on APS-C (Canon) gives the view of 45-112mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 57-142mm
• Full frame: 45-112mm
• APS-C: 30-75mm
• APS-C (Canon) (yours): 28-70mm
• Micro Four Thirds: 22-56mm
• 1-inch: 17-41mm
• 1/1.3-inch: 12-31mm
• 1/1.7-inch: 9.7-24mm
• 1/2.3-inch: 8-20mm

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.