// multi-utility computation suite · offline · instant · precise
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math.interest-compound Calculator
Calculates the future value of an investment with compound interest and shows the total gain separated into principal and interest earned. The interest-on-interest effect becomes dominant after roughly one doubling period — this makes the compounding effect visible.
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.
N
Reference formula or conversion factor shown for context.
T
Reference formula or conversion factor shown for context.
Results
compound amount
Sample size or count used in the calculation.
total gain
The combined total across all inputs and components.