Accrued Interest Calculator
Find the interest that has built up on an amount between two dates, such as a bond or a loan between payments. Enter the amount, the yearly rate and the two dates.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Simple interest is the amount times the yearly rate times the number of days, divided by 365. The days are counted from the first date to the second, and the first day is not counted.
Some bonds and loans use a different day count, such as 30-day months, so check the terms of the one you hold.
Worked example
On $10,000.00 at 5% a year, from the first date to the second is 181 days. Interest accrued over that time is $247.95.
Questions
Why divide by 365?
It is the usual convention for simple interest. Some bonds count 360 days or use 30-day months, which gives a slightly different answer.
Does this compound?
No. Simple interest is charged only on the original amount. Compound interest adds the interest to the balance each period.
What if the end date is before the start date?
The answer is then negative. Put the earlier date first.
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