How much is a jar full of pennies worth?

Excuse me, could you possibly clarify the value of a jar that's brimming with pennies? I understand that pennies are quite small in denomination, but when accumulated in a large jar, I'm curious about the total amount they might represent. Is there a straightforward way to determine the monetary worth of such a jar, perhaps by estimating the number of pennies it contains and then multiplying that by their individual value? I'd be grateful for any insights you might have on this matter.