56mm on the fujifilm x t5 full frame equivalent?

56mm on the Fujifilm X-T5 (APS-C) gives the view of 84mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 106mm
• Full frame: 84mm
• APS-C (yours): 56mm
• APS-C (Canon): 52mm
• Micro Four Thirds: 42mm
• 1-inch: 31mm
• 1/1.3-inch: 23mm
• 1/1.7-inch: 18mm
• 1/2.3-inch: 15mm

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.