How much can I save by paying my credit card weekly instead of once a month?

You can save a modest but real amount, because interest is calculated on your average daily balance. Making smaller, more frequent payments lowers that average balance throughout the cycle, so less interest accrues than if you paid the same total in one lump at the due date. On a large balance at a high APR, this can trim a meaningful chunk of interest over a year.

The bigger benefit is often behavioral: frequent payments keep the balance visible and prevent it from ballooning. A related trick is timing a payment before your statement closes to lower the balance that gets reported to the bureaus, which helps your utilization. The total you pay matters most, but paying more often and earlier is a free optimization on top of it.