The diameter of a US nickel is 21.21 millimeters.
The united states Nickel has a diameter of 21.21 mm or 2.2121 cm.
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The diameter of a US nickel is 0.835 inches.
A US nickel has a diameter of 21.21mm
A US nickel has a diameter of 21.21mm and a thickness of 1.95mm
The US nickel has been 21.2 mm in diameter ever since 1883.
US coins are normally measured in metric units. A nickel is 21.21 mm in diameter and there are 25.4 mm in an inch, so the diameter in inches would be 21.21/25.4 = 0.835 inches