// multi-utility computation suite · offline · instant · precise
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tool.interest-simple Calculator
Calculates simple interest (I = P × r × t) and total repayment from principal, annual rate, and time in months or years. Simple interest is used for short-term loans and some savings products — understanding it prevents confusion with compound interest.
Inputs
P
Original borrowed or invested amount before interest. Interest accrues on the outstanding principal balance.
R
Yearly rate as a percentage. The calculator converts this to the appropriate period rate automatically.
T
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Freq
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Results
simple interest
Sample size or count used in the calculation.
total amount
The combined total across all inputs and components.
interest per payment period
Sample size or count used in the calculation.
daily interest
Sample size or count used in the calculation.
interest rate %
The value at the specified point or condition.
SI = P × r × t
Reference formula or conversion factor shown for context.