The height of "1" on its own is ambiguous without a unit. However, if you mean 1 foot, it is equivalent to:

• 12 inches
• 30.48 centimeters
• 0.3048 meters

So, 1 foot tall is 30.48 cm or about 0.3 meters. If you mean 1 inch, it is 2.54 cm. Please specify the unit if you want a different interpretation. Let me know if you want the height converted from 1 foot or 1 inch or some other unit.