3 inches = 76.2 mm
You can type "3 inches into mm" into www.Google.com to get the conversion. This works for most conversions of any type (length, volumes, energy, temperature, currency (don't know how well this works), weight, etc). It also does calculations (and calculations with units). I use this for some calculations in my research.
Chat with our AI personalities
4 feet 10 inches
The volume of a 3-inch cube is 27 cubicinches. (not "inches")
If you have a length of 25 mm and then 12 mm it makes a length of 37 mm.
45 mm is thicker than 25 mm
2 mm is smaller.