1.5 inches. For diameters greater than one inch, inches or millimeters are usually used, not calibers.
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A .50 caliber gun can be used as an anti aircraft weapon. I am not up to his caliber; he outperforms me on the job. An athlete of his caliber surely cannot be defeated.
I will use caliber in TWO sentences: 1- The position of lead chemist would be perfect for someone of your caliber. 2- The sniper asked HQ to send more 50 caliber rounds; he is almost out of ammunition.
I think that a 'caliber' is also used to fix cars.
Caliber is a term used to describe the diameter of a bullet in SAE units. 100 Caliber = 1 inch a 45 caliber bullet has a diameter of .45 inches.
the school kept it's high caliber by accepting students with high scores on the entrance test