Use the free Annuity Calculator below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server. All results are estimates only and are not financial or tax advice.
What This Annuity Calculator Shows You
An annuity is a series of regular payments, and this calculator shows what such a series grows to over time. You enter the payment per period, how many periods there are each year, the yearly return, and how many years you will keep paying. The tool reports the future value of all your payments, how much you contributed yourself, and how much growth added. It shows two versions: payments made at the end of each period, which is the usual case for savings, and payments made at the start of each period, which earn a little more because each payment starts growing sooner. The difference between those two versions is small in one year and noticeable over decades.
How the Future Value Formula Works
The future value of a regular payment stream comes from compounding each payment for the time remaining after it is made. The earliest payment compounds the longest, so it contributes the most growth, while the final payment barely compounds at all. The calculator uses the standard formula: payment multiplied by the growth factor minus one, divided by the periodic rate. With monthly payments of 200 at 6 percent a year for 20 years, the future value is about 92,400, of which 48,000 is your own contributions and about 44,400 is growth. That split surprises many people, because growth ends up nearly matching what they paid in. Lengthen the horizon to 30 years and growth overtakes contributions by a wide margin, which is why time is the most powerful input in the whole calculation.
Ordinary Annuity Versus Annuity Due
An ordinary annuity pays at the end of each period: you save during the month, then deposit at month end. An annuity due pays at the start: the deposit goes in first, then the month passes. Each payment in an annuity due therefore earns one extra period of growth, so its future value is the ordinary value multiplied by one plus the periodic rate. With monthly payments at 6 percent, that extra month of growth per payment adds about 0.5 percent to the total, which is roughly 460 on a 92,400 result. The distinction matters most when you are comparing products: a pension or insurance quote that assumes payments at the start of the period will show a slightly higher future value than one that assumes payments at the end, even with identical payments and rates.
A Worked Example
Take quarterly payments of 500 at 5 percent a year for 15 years. That is 60 payments totalling 30,000 of your own money. The calculator shows a future value of about 44,700 for end-of-period payments, so growth adds about 14,700. Switch to monthly payments of 167 instead, keeping the yearly total near 2,000, and the result is slightly higher, because money goes in sooner on average. Raise the return to 7 percent and the future value jumps to about 50,700, which shows how sensitive long horizons are to the assumed return. This sensitivity is a warning as much as a promise: a high assumed return makes any projection look good, so test a lower return too and plan around the lower figure. All results are estimates only, not financial or tax advice.
Using the Calculator for Real Plans
For retirement saving, enter the monthly amount you actually save, a cautious return, and the years until you plan to stop. Compare the result with the amount you think you will need, and adjust the payment or the horizon rather than assuming a heroic return. For a savings goal such as a house deposit, work backwards: try payment levels until the future value reaches your target by your deadline. For education funding, remember that costs rise with inflation, so a future value in nominal terms overstates what the money will buy; pair this calculator with the inflation calculator to see the result in today’s money. For business planning, the same maths values a stream of lease payments or subscription income.
Common Mistakes to Avoid
The most common mistake is assuming a high return for the whole period without testing a lower one. Another mistake is forgetting fees, which quietly reduce the effective return year after year. A third mistake is entering a yearly payment in the monthly field, or the reverse, which throws the result off by a factor of twelve; always check the periods-per-year setting. A fourth mistake is treating the future value as guaranteed. Returns vary, payments can be interrupted, and inflation erodes purchasing power, so treat the result as a planning estimate and revisit it yearly as real numbers replace assumptions.
Frequently Asked Questions
What is the difference between future value and present value? Future value asks what a payment stream grows to, while present value asks what a future stream is worth today; the present value calculator covers the second question. Does the calculator include tax? No, returns are shown before tax, and tax rules differ by country and account type. What if my return is zero? Then the future value simply equals your total contributions, and the calculator handles that case. Can I model rising payments? Not directly; run the calculator for a flat payment, then run it again for the higher payment level, and compare the two to bracket the real result.