What is 55 210mm on canon aps c in full frame?

55-210mm on APS-C (Canon) gives the view of 88-336mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 111-425mm
• Full frame: 88-336mm
• APS-C: 59-224mm
• APS-C (Canon) (yours): 55-210mm
• Micro Four Thirds: 44-168mm
• 1-inch: 33-124mm
• 1/1.3-inch: 24-93mm
• 1/1.7-inch: 19-73mm
• 1/2.3-inch: 16-60mm

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.