Just a brief question regarding bank interest rates, my apologies if this is a duplicate, I did a quick search but came up with no results relating to my question, surprisingly.

Also, please excuse my ignorance with interest-based math. Once upon a time it all made sense, but I'm severely out of practice.

My bank advertises a .10% interest rate on my specific type of savings account. This interest is compounded monthly. According to their website "Interest [is] calculated each day and paid monthly."

However, with an average of \$1000, I'm credited \$.10 each month. This seems incorrect to me.

Prepare to be baffled by incorrect maths (again, please correct anything I've got wrong, and most likely went on a tangent with):

My thought process so far

If I had \$1000 in my savings account, at .10% interest this should be...

.10% / 100 = .001

\$1000 * .001 = \$1

Therefor I should be receiving \$1/month instead of \$.10/month

It appears I'm being credited only .01% monthly. I hope I'm overlooking something simple, as these are the basics I remember from grade school math regarding percentages, and the way I currently understand the world of math. I'm ready to have my reality ripped from under me though, as long as I'm not losing any money I'm entitled to :)

Any help is appreciated. An ELI5 type answer might be the most helpful, it's been a long week.

  • $\begingroup$ To get the monthly interest you also have to divide that annual rate by 12. So it seems it should be $0.083 per month. $\endgroup$ Apr 17 '15 at 19:39

I imagine the $.10\%$ quoted rate is annual. So the monthly rate would be $\frac{.10\%}{12}\approx .0083\%=.000083$. That should come out to about $8.3$ cents per month interest on $\$1000$.


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