Daily Interest Calculator

This works interest out by the day, either over a number of days you give or between two dates. Enter the balance, the annual rate and the day count basis and it returns the daily rate, the per diem amount, the days counted and the interest for the period, with the option to compound daily instead of accruing simply. The basis is the point: dividing a rate by 360 instead of 365 makes every day dearer, and 30/360 changes the day count itself rather than the rate. Which one applies is written in the agreement rather than chosen, and a range here counts the first day but not the last.