Compound investment calculator.
Project a starting amount and fixed contributions using an annual effective rate you enter.
Your projection will appear here.
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Exact month events, one entered rate.
The annual effective rate is converted to an equivalent monthly rate with high-precision Decimal power.
Each month applies a beginning contribution before growth or an end contribution after growth when that frequency event occurs. Quarterly events occur every 3 months; yearly events every 12.
Modeled gain or loss = projected value − total contributed. Results are not guaranteed and exclude tax, inflation and fees.
Understand this model.
Is the entered rate a prediction?
No. It is only your annual effective rate assumption and is not fetched or recommended.
Why does contribution timing change the result?
A beginning contribution participates in that month's modeled growth; an end contribution does not.
Can I model changing deposits or rates?
No. This MVP uses one fixed contribution and one fixed annual effective rate.