That's an incredibly broad question because US cents ("pennies") were made of copper from 1793 to 1857, copper-nickel from 1857 to 1864, and bronze (95% copper) from 1864 to 1942 and 1944 to mid-1982. On top of that they were made at 3 different mints, so there are many hundreds of possibilities to choose from.
Please post a new question with the coin's specific date. If you word the question as "What is the value of a (date) US cent?" (where 'date' is the coin's date, obviously) you should be taken to a full answer.
If it's a US 1 cent coin it's zinc not copper and value is 1 cent
2 cents, for its copper content.
It's currently worth 2 cents for the copper.
About 2 cents, due to copper content.
It's currently worth 2 cents for the copper.
If it's a US 1 cent coin it's zinc not copper and value is 1 cent
...One cent. It is in common circulation and made out of copper coated zinc.
It's worth 2 cents for the copper.
2 cents, for its copper content.
It's currently worth 2 cents for the copper.
About 2 cents, due to copper content.
It's currently worth 2 cents for the copper.
Any US cent dated 1982 and before is mostly copper, billions are still in circulation and are face value.
A 1983 Lincoln cent is actually copper plated zinc, 1982 was the last year for copper pennies. It's just a penny.
It's worth about 2 cents for the copper.
It's not a rare coin. It's worth 2 cents for its copper content.
1 cent. It's actually made of 97.5% zinc and is only copper-plated.