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During the accumulation phase of an annuity, regular payments grow with compound interest — but exactly how much they grow to depends on whether each payment lands at the start or end of its period. This calculator finds the future value of a series of regular payments into an annuity, for both ordinary annuities and annuities due, with a full step-by-step solution.
How it works
Enter the regular payment amount, annual interest rate, number of years, and whether payments occur at the end of each period (ordinary annuity) or the start (annuity due). The calculator applies the future value of an annuity formula.
- Enter monthly payment ($).
- Enter annual interest rate (%).
- Enter number of years.
- Enter annuity type.
- Click Calculate to see your results.
Examples
Contributing $200/month for 20 years at 6%
An ordinary annuity of $200 monthly contributions at 6% annual interest over 20 years grows to $92,408.18 — from $48,000 in contributions and $44,408.18 in interest earned.
Who should use it
- Projecting how much a regular retirement or savings contribution will grow to by a target date.
- Comparing the growth difference between ordinary annuity and annuity due contribution schedules.
Industry applications
- Retirement and financial planning
- Personal savings and investment planning
Advantages
- Supports both ordinary annuities and annuities due.
- Separately reports total contributions versus interest earned for clarity.
Limitations
- Assumes a fixed contribution amount and interest rate for the entire period, without modeling contribution increases or rate changes over time.
Common mistakes to avoid
- Selecting "ordinary" or "due" without checking which actually matches the real payment schedule, which produces a slightly wrong future value.
- Entering an annual contribution amount into a field expecting a monthly one (or vice versa), which drastically changes the result.
Best practices
- Confirm whether your actual account applies contributions at the start or end of each period before choosing ordinary vs. due, since most retirement and savings accounts are ordinary annuities.
Tips
- Even a modest regular contribution compounds significantly over long time horizons — use this calculator to see the impact of starting contributions earlier versus later.