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Explore interest calculated on an unchanged starting amount.
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EXPLORE YOUR NUMBERS
Explore interest calculated on an unchanged starting amount.
Interest = principal × annual rate / 100 × months / 12. Total = principal + interest.
Simple interest only: interest does not earn additional interest. Assumes the principal and annual rate stay unchanged, with no deposits, repayments, fees, or taxes. This is not an amortized-loan calculation or a quoted account return.
BEFORE YOU BEGIN
Estimates are enough to explore. Keep every money amount in the same selected currency.
A starting principal that stays unchanged.
A hypothetical annual simple-interest rate.
The length of the scenario in complete months.
MAKE THE RESULT USEFUL
Use this tool only for a simple-interest scenario. Compare the interest amount with the original principal. For interest that compounds or a balance with monthly repayments, choose the matching growth or loan tool instead.
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TRY ANOTHER SCENARIO
Compare a 12-month and a 24-month duration at the same principal and rate. In this model, doubling time doubles interest because interest does not compound.
Return to your numbersChanging inputs here does not send them to Matt or save them between visits.
A FEW THINGS YOU MAY BE WONDERING
Simple interest is calculated only on the unchanged starting principal. Compound growth adds interest to the balance so later growth also applies to earlier interest.
Not to estimate its repayment schedule. This model never reduces principal. The loan payment calculator models a fixed-rate loan with regular monthly repayments.
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