How to Calculate Daily to Calculate Monthly InterestSimple Interest Exact Days Loan Calculator3 Ways to Calculate Daily Interest - wikiHowCompounding Daily Interest. To calculate the daily compounding interest on a $10,000, 10% note for 90 days (please allow for rounding differences): Convert the percentage rate to a decimal: 10 ÷ 100 = , Convert the annual rate to a daily rate: ÷ 365 = , Add 1 to the daily …26/07/2011 · The Simple Interest Calculation Formula is: Loan Amount (in dollars and cents) x Interest Rate x Time (in days) = Total Interest You must select the values to enter the Starting Month, Day and Year, and the Ending Month, Day and Year for the time of ;· Daily Interest means an amount calculated by multiplying the daily principal balance of a Loan by the associated daily interest rate on that principal. Formula to calculate daily interest. We begin by identifying the annual interest rate and convert it to a decimal. Then divide the annual interest rate by 365 days to get the daily interest ;· 1 day to 1 week: secured, fixed: 5 year auto loan with bad credit: $0: 14% to 16%: rates locked in for duration of loan: 1 day to 1 week: secured, fixed: 30-year mortgage: 2% to 5%: rates locked in for duration of loan: 30-60 days: secured, fixed: 15-year mortgage: 2% to 5%: rates locked in for duration of loan: 30-60 days: secured, fixed: 5/1 ARM 2% to 5%: