A PENNY coin has a Diameter of exactly 1&3/16ths Inches which is same as 1.1875 inch.
The foregoing applies to a British penny. A US 1 cent piece is 19.05mm (.75 inches) in diameter, 1.55mm thick, and weighs 2.5 grams
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You would use millimetres.
A current US one-cent coin (penny) is 19.05 mm in diameter and 1.55 mm thick.This is about 0.442 cubic centimeters (441.8 mm3) or 4.42 x 10-7 cubic meters.The British penny (one new pence, steel) is 20.32 mm in diameter and 1.65 mm thick.This is about 0.535 cubic centimeters or 5.35 × 10-7 cubic meters.(see related question below)
If the Earth were the size of a penny, the Sun would be about the size of a large beach ball or around 1.4 meters (4.6 feet) in diameter in comparison. The Sun is much larger than the Earth, with a diameter about 109 times that of Earth.
The diameter of a penny (British decimal coin - 1p) is 20.3 millimetres. Therefore, other coins will also be measured in millimetres
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