3/4 inch in mm and decimal

3/4 in = 0.75 in = 19.050 mm. Closest metric drill: 19 mm.

Nearby drill sizes

Drill	Type	Inch	mm	Difference
11/16	fraction	.6875 in	17.462	-62.5 thou
45/64	fraction	.7031 in	17.859	-46.9 thou
23/32	fraction	.7188 in	18.256	-31.3 thou
47/64	fraction	.7344 in	18.653	-15.6 thou
3/4	fraction	.7500 in	19.050	0.0 thou
49/64	fraction	.7656 in	19.447	15.6 thou
25/32	fraction	.7813 in	19.844	31.3 thou
51/64	fraction	.7969 in	20.241	46.9 thou
13/16	fraction	.8125 in	20.637	62.5 thou

1 thou = 0.001 in = 0.0254 mm. Drills a few thou apart are usually interchangeable for clearance holes, but not for tap drills or reamer pilots.