How Painful are periods?

I know periods are painful, but how much?

I saw some videos on internet where girls and guys use some device like 'cramp simulator', where some guys wouldn't be able to handle pain at level3 from1-10 but some girls would laugh at level 10 whereas some guys wouldn't feel anything at level10 but girls would cry at level 3 I think that is fake and the simulator is not fully accurate and doesn't give complete experience.

I want girls to tell that how painful are periods with giving some relative examples and comparing them to some pain which both genders experiences.

Guys who already know good examples, please tell.

How Painful are periods?
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