What is 18mm f6 3 on micro four thirds in full frame?

18mm on Micro Four Thirds gives the view of 36mm on full frame. For the same depth of field, f/6.3 there behaves like about f/12.6 on full frame. Exposure doesn't change: f/6.3 gives the same brightness on any sensor.

The same view on every common format:

• Medium format (44 x 33): 46mm at about f/15.9 for the same depth of field
• Full frame: 36mm at about f/12.6 for the same depth of field
• APS-C: 24mm at about f/8.4 for the same depth of field
• APS-C (Canon): 22mm at about f/7.9 for the same depth of field
• Micro Four Thirds (yours): 18mm at about f/6.3 for the same depth of field
• 1-inch: 13mm at about f/4.7 for the same depth of field
• 1/1.3-inch: 10mm at about f/3.5 for the same depth of field
• 1/1.7-inch: 7.8mm at about f/2.7 for the same depth of field
• 1/2.3-inch: 6.4mm at about f/2.2 for the same depth of field

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.