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How to get best deals on Black Friday? The struggle is real, let us help you with this Black Friday calculator!

The consumer surplus calculator is a handy tool that helps you compute the difference between what consumers are willing to pay for a good or service versus its market price.

The credit card interest calculator helps you to estimate the expected interest on your unpaid credit card balance.

The sleep calculator can help you determine when you should go to bed to wake up happy and refreshed.