Interest Calculator — Simple, Compound & Penal Interest
Use your own assumptions to calculate simple or compound interest on an overdue sum between two dates before deciding the next operational step.
Estimate only; confirm current law, facts, and official filing requirements.
Period: 90 day(s)
Interest amount
₹14,794.52
Total payable (principal + interest)
₹5,14,794.52
Simple interest over 90 day(s) at 12% per annum.
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Method and sources
Counts the entered calendar-day period on the selected day-count basis and applies either simple interest or the selected compounding assumption.
Frequently asked questions
Simple interest is calculated only on the original principal for the entire period. Compound interest is calculated on the principal plus any interest already accrued, added back at each compounding period (monthly, quarterly or annually), so it grows faster over time.
Use the rate specified in the underlying contract, promissory note or invoice terms. If none is specified, courts may award interest under the Interest Act 1978 or the Code of Civil Procedure 1908 at their discretion; MSME/B2B dues have a separate statutory rate under the MSMED Act 2006.
This tool counts the calendar days between the "from" and "to" dates (inclusive of both end dates is not assumed — it is a straight day-count difference) and converts that to years by dividing by 365.
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Reviewed 2026-09-14. Interest Act, 1978