Investment Calculator

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Current age Future age

Periods (years) Target future value (R) Annual interest rate (%)

Default annual interest growth: 10.4%, based on the S&P 500’s average annual total return over the 30-year period from January 1996 to December 2025.

Annual interest rate and investment horizon are converted to months to align with the monthly contribution calculation.

Formula used

PMT = FV × r / ((1 + r)ⁿ - 1)

FV = target future value

r = monthly interest rate (annual rate ÷ 12)

n = number of monthly payments (years × 12)

Annual interest rate and periods are converted to months to match the monthly contribution payment schedule.

Results

Enter values and press Calculate.

Default annual interest growth: 10.4%, based on the S&P 500’s average annual total return over the 30-year period from January 1996 to December 2025. Data sourced from Fidelity Financial Solutions and calculated using the S&P 500 (SPX) monthly return series.