Baking expertAlice Medrichrecommends using standard US coins to check.

A standard penny weighs 2.5 grams, while a nickel weighs 5 grams and a quarter weighs 5.67 grams.

it’s possible for you to find out the weight of all coins at theUnited States Mint official page.

Merdich adds that you shouldn’t use misshapen coins as their weight will be different.

When in doubt, add more coins before deciding your scale is off.

If it’s inaccurate, recalibrate your scale.

Just use more coins than a single penny.

How to Check the Accuracy of Your Kitchen Scale| Food52