14.5mm would be the caliber.
The actual bullet diameter of the 14.5x114 cartridge is 14.88mm, which translates to .586 inches, so, if it could be and were marketed on the US civil market, it would probably be marketed as something like .58 caliber or such.
Multiply it by 10 and so 145 cm = 1450 mm
(145 mm) x (90 mm) x (120 mm) = 0.413693434 US gallons
Roughly .275 or .28 caliber. Take MM divided by 25.4 (mm/inch) and you get caliber in hundredths of an inch.
9 caliber is 0.09 inch, smaller than any standard ammunition made. 0.09 inch = 2.286 mm. Perhaps you were thinking "What caliber is 9 mm?". 9 mm = 0.354 inch = 35.4 caliber.
.68 caliber is ABOUT 17mm.
The question can't be answered since you didn't supply a caliber or mm measurement.
Hint: 10 mm = 1 cm... 145 mm = 145 x 0.1 cm = 14.5 cm
Multiply by 10= 1450 mm
No! 9mm = .35 caliber - .354 caliber!
7.62 mm (or 30 caliber) and 5.56 mm (or 223 caliber) are common rifle cartridges. Pistols, machine guns, and artillery will of course be different from these.
9 mm
5.56 mm