What is 16 25mm on aps c in full frame?

16-25mm on APS-C gives the view of 24-38mm on full frame.

The same view on every common format:

• Medium format (44 x 33): 30-47mm
• Full frame: 24-38mm
• APS-C (yours): 16-25mm
• APS-C (Canon): 15-23mm
• Micro Four Thirds: 12-19mm
• 1-inch: 8.9-14mm
• 1/1.3-inch: 6.7-10mm
• 1/1.7-inch: 5.2-8.2mm
• 1/2.3-inch: 4.3-6.7mm

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.