What is 8 15mm on canon aps c in full frame?

8-15mm on APS-C (Canon) gives the view of 13-24mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 16-30mm
• Full frame: 13-24mm
• APS-C: 8.5-16mm
• APS-C (Canon) (yours): 8-15mm
• Micro Four Thirds: 6.4-12mm
• 1-inch: 4.7-8.9mm
• 1/1.3-inch: 3.6-6.7mm
• 1/1.7-inch: 2.8-5.2mm
• 1/2.3-inch: 2.3-4.3mm

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.