What This Calculator Does
You want to know what your regular savings contributions will be worth in 20 or 30 years. Maybe you are setting aside $400 a month for retirement. Maybe you are building a college fund. An annuity calculator takes your monthly contribution, applies compound interest, and shows you the future value at the end of the term.
An annuity is a series of equal payments made at regular intervals. When used for saving, you make recurring contributions that grow with interest over time. This calculator determines the future value of your annuity: what your regular payments will be worth when the term ends.
Annuity rates in 2026 remain historically attractive. Multi-Year Guaranteed Annuities (MYGAs) are offering 5.25% to 5.65% depending on term length, driven by interest rates that have stayed well above pre-2022 levels. For pre-retirees, the current rate environment represents the best buying opportunity in over a decade. According to a UCLA Anderson Review analysis of NBER research, two-thirds of Americans are more scared of running out of money in retirement than of death itself, yet only 12% of those over 50 with $100,000 or more in savings have purchased a life annuity.
Inputs Required
- Monthly Payment: The fixed amount contributed each period
- Initial Lump Sum: Any starting balance already invested
- Annual Interest Rate: The expected rate of return on the annuity
- Duration: How many years the payments continue
- Annuity Type: Whether payments are made at the end (ordinary) or beginning (annuity due) of each period
Outputs Provided
- Future Value: The total accumulated value at the end of the term
- Total Contributions: The sum of all payments made plus the initial lump sum
- Total Interest Earned: Growth generated by compound interest over the period
- Growth Chart: Visual view of how contributions and total value grow over time
How the Calculation Works
For an ordinary annuity (payments at end of period), the future value formula is:
FV = PMT x [((1 + r)^n - 1) / r]
- FV is the future value of the annuity
- PMT is the payment amount per period
- r is the interest rate per period (annual rate divided by 12 for monthly)
- n is the total number of periods
For an annuity due (payments at beginning of period), the result is multiplied by (1 + r), reflecting that each payment earns one additional period of interest. Over 20 or 30 years, this small difference compounds into a meaningful gap.
How to Use the Calculator
- Enter your planned monthly contribution amount
- Add any starting balance you already have
- Set the expected annual interest or return rate
- Enter how many years you plan to contribute
- Select ordinary annuity (most common) or annuity due
- Review the future value and the breakdown between contributions and growth
For the interest rate, use a conservative estimate. A diversified portfolio might average 6% to 8% over long periods, but annuity products offer guaranteed rates. As of 2026, top MYGA rates range from 5.25% (3-year) to 5.65% (5-year). If you are modeling retirement savings more broadly, pair this with our Retirement Calculator or Compound Interest Calculator.
Example Calculations
Example 1: The Steady Saver
Contributing $500 per month for 20 years at 6% annual interest with no starting balance:
- Total contributions: $120,000
- Future value (ordinary annuity): approximately $232,000
- Interest earned: approximately $112,000
Nearly half the final value came from investment growth rather than money you put in. Over 30 years at the same rate, the future value jumps to approximately $502,000, with interest accounting for about $322,000 of it. The extra 10 years nearly doubles the result because compound interest accelerates over time.
Example 2: The Pre-Retiree with a Lump Sum
Robert is 55 and has $80,000 already saved. He contributes $750 per month for 10 years at 5.5% annual interest (close to current MYGA rates), preparing for retirement at 65:
- Initial lump sum: $80,000
- Total contributions over 10 years: $90,000
- Future value at 65: approximately $268,000
- Interest earned: approximately $98,000
The initial $80,000 grows to about $137,000 on its own, while the monthly contributions add another $131,000. Both components benefit from compound interest. Robert can then use our Annuity Payout Calculator to see how much monthly income this balance generates during retirement.
Real World Scenarios
Saving for Retirement with a Fixed Annuity
Angela, a 40-year-old marketing manager in Denver, contributes $600 per month to a fixed annuity for 25 years at 5.5%. The calculator shows her projected balance at maturity: approximately $366,000. Her total contributions are $180,000, meaning interest provides nearly half her final balance. She can adjust the contribution amount to see what it takes to reach a $500,000 target.
College Education Fund
Parents saving for a newborn child's college education contribute $300 per month for 18 years at 5%. The annuity calculator shows they will accumulate approximately $104,000. With total contributions of $64,800, the interest adds about $39,000. They can increase the monthly amount to $400 to reach roughly $139,000, which is closer to projected tuition costs at a public university. For broader education planning, consider our College Cost Calculator.
Business Savings Reserve
A small business owner sets aside $1,000 per month into a business savings annuity for 10 years at 5.25% (matching current MYGA rates). The calculator projects a reserve fund of approximately $158,000. This is useful for planning capital expenditures, weathering slow seasons, or funding a future acquisition.
Why This Calculation Matters
Regular, disciplined contributions combined with compound interest are the foundation of long-term wealth building. The annuity calculation makes this concrete. It shows exactly how much your patience and consistency will be worth at any future point.
The difference between ordinary annuity and annuity due also matters in practice. Insurance products, lease agreements, and retirement plans each use one type or the other. Over long periods, annuity due produces a meaningfully higher future value because each payment starts earning interest one period earlier.
Common Mistakes to Avoid
- Using annual instead of monthly rates: When compounding monthly, divide the annual rate by 12 before applying the formula. A 6% annual rate becomes 0.5% per month.
- Confusing annuity type: Most savings and investment plans use ordinary annuity. Annuity due is more common for lease payments and some insurance products.
- Ignoring fees: Annuity products often carry management fees, surrender charges, and rider costs that reduce effective returns. Use the net return rate after fees, not the advertised rate.
- Overstating interest rates: Higher rates produce dramatically higher future values. Use a conservative, realistic rate. Current MYGA rates of 5.25% to 5.65% are guaranteed, but equity-based returns fluctuate.
- Not accounting for inflation: A dollar in 20 years buys less than a dollar today. A 3% inflation rate over 20 years cuts purchasing power by roughly 45%.
Limitations of This Calculator
This tool calculates the future value of level, fixed contributions at a fixed interest rate. It does not model variable annuities tied to market performance, indexed annuities with caps and floors, or contribution amounts that change over time. The calculator does not account for taxes on earnings, inflation, surrender charges, or insurance rider fees. For variable products, actual returns will differ from the fixed rate used here. This calculator does not replace professional advice from a licensed financial advisor or insurance agent.
Authoritative Research and Resources
- UCLA Anderson Review: The Annuity Puzzle Revisited - An analysis of NBER research explaining why only 12% of eligible Americans buy annuities despite widespread fear of outliving savings, and how product design and policy changes are closing the gap.
- NBER Working Paper: The Annuity Puzzle Revisited - The underlying National Bureau of Economic Research paper by Hershfield, Shu, Brown, Hurwitz, Milevsky, Mitchell, and Toland on barriers to lifetime income adoption.
- Annuity Journal: Annuity Rates by Age (2026) - Current 2026 annuity rate tables showing MYGA and SPIA payout rates by age, term, and carrier.
For the distribution phase of retirement, see our Annuity Payout Calculator. For broader retirement planning, try our Retirement Calculator.