The answer depends on which country's penny the question is about. Many countries use a penny as a minor currency unit and since you have not bothered to share the name of the country, I cannot provide a more useful answer.
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Diameter of an Australian penny (no longer currency) is 1 and 3/16".
There are several countries in which the minor currency unit is a penny - including the US where a cent is called a penny!The UK penny has a diameter of 20.3 mm.
The diameter does not affect the length. It is a separate dimension. Diameter is the cross sectional measure of a circular object.
this depends on which penny you are asking about.The US penny, the Australian penny, the British penny, Canadian penny and the Irish penny coin.Each one is a different size and weight.Diameter of an Australian penny (no longer currency) is 1 and 3/16".Diameter of an old British penny (no longer in use) was 1.25". Modern pennies are 20.03 mm, or about 4/5"Diameter of a U.S. cent (penny) - 0.75"
A millimetre: diameter of a pin head.