The Annuity Payout Calculator finds the periodic payment that a lump sum can sustain over a fixed number of years at a stated interest rate. Enter the lump sum, the annual rate, the number of payout years and how often payments are made, and the calculator returns the payment amount that exactly exhausts the balance by the end of the term.
This is the reverse of saving toward a goal. Instead of asking how large a balance grows from regular deposits, the payout question starts with a balance already in hand and asks how much income it can generate before it runs out. That is exactly the question behind converting a retirement account, a settlement, or an inheritance into a stream of regular payments.
*These results are estimates for information only, not insurance, investment, or retirement advice.*
Turn a lump sum into a payment stream
An annuity payout takes a present lump sum and spreads it, plus the interest it earns along the way, into equal payments over a set number of periods.
Each payment includes both a return of some principal and interest earned on whatever principal is still invested, so the balance declines to exactly zero on the final payment rather than all at once.
The formula rearranges the present-value annuity equation to solve for the payment: PMT = PV x i / (1 - (1 + i)^-n), where PV is the lump sum, i is the interest rate per period and n is the total number of payments. The Annuity Payout Calculator applies this directly once the lump sum, rate, term and payment frequency are entered.
Work through a full worked example
Consider a $250,000 lump sum invested at a 5% annual rate, paid out monthly over 20 years. The monthly rate is 5% divided by 12, and the number of monthly payments is 20 x 12 = 240. Applying the payout formula to those figures gives a sustainable monthly payment of about $1,649.89.
Over the full 240 months, those payments total roughly $395,974, meaning the $250,000 lump sum, thanks to interest earned along the way, supports considerably more in total payouts than its starting value. That gap between the lump sum and the sum of all payments is exactly the interest the remaining balance earns each month before it is drawn down further. The Annuity Payout Calculator reports the payment figure directly rather than requiring a spreadsheet formula to reach it.
See how the rate and term change the payout
Raising the interest rate increases the sustainable payout, because the invested balance earns more each period even as it shrinks, which means less of the lump sum's original principal has to be drawn down to produce the same income. Lowering the rate has the opposite effect and reduces the payment the same lump sum can support.
Term length works differently. A longer payout period spreads the same lump sum over more payments, so each individual payment is smaller even though the total number of payments made is larger. A shorter payout period produces a bigger payment per period but exhausts the balance sooner. Someone converting a $250,000 balance into income over 10 years instead of 20 would receive a noticeably larger monthly check but for half as long. The Annuity Payout Calculator lets both the rate and term be adjusted independently so the trade-off between payment size and payout duration is easy to see.
Match payment frequency to how the annuity actually pays
Payout frequency, whether annual, quarterly or monthly, changes both the periodic rate and the total number of payments used in the formula.
Monthly payouts use the annual rate divided by twelve and years multiplied by twelve; quarterly payouts divide the rate by four and multiply years by four; annual payouts use the stated annual rate directly against the number of years.
Switching frequency without adjusting for it is a common source of error when comparing annuity quotes by hand, since a monthly payment figure and an annual payment figure describe very different totals per year even from the same lump sum and rate. The Annuity Payout Calculator applies the correct conversion for whichever frequency is selected, so quotes stated in different payment schedules can be compared on a fair, like-for-like basis once converted to the same annual total.
Know what this calculation does and does not cover
This payout calculation assumes a fixed number of periods known in advance, a fixed rate held constant for the entire term, and payments that occur exactly on schedule with no missed periods or early withdrawals.
Real insurance annuity products, especially those quoting income for the rest of a person's life rather than a fixed term, price the guarantee using mortality tables, fees, riders and reserve requirements that this simple time-value formula does not include.
Use the Annuity Payout Calculator to understand the underlying mechanics: how a lump sum, a rate and a term combine to produce a sustainable payment. For a binding insurance quote with lifetime guarantees, survivor benefits or inflation adjustments, the insurer's own illustration is the authoritative figure, since it reflects pricing this educational formula intentionally leaves out.
Frequently asked questions
How is an annuity payout calculated?
An annuity payout is calculated with the formula PMT = PV x i / (1 - (1 + i)^-n), where PV is the lump sum, i is the periodic interest rate and n is the number of payments. A $250,000 lump sum at 5% paid monthly over 20 years produces a payout near $1,649.89 per month.
Why does a higher interest rate increase the payout?
A higher interest rate increases the payout because the remaining balance earns more between payments, so less of the original principal needs to be drawn down to produce the same income stream. The Annuity Payout Calculator reflects that directly when the rate is raised.
Does a longer payout term mean smaller payments?
Yes, spreading the same lump sum over a longer payout term produces smaller individual payments, since the total balance and interest earned are divided across more periods. A shorter term produces larger payments but exhausts the balance sooner.
Is this the same as a lifetime insurance annuity quote?
No, this calculation uses a fixed, known number of periods, while a lifetime insurance annuity prices in mortality assumptions, fees and guarantees that change the payment. Use an insurer's illustration for a binding lifetime income quote.
What happens to the balance at the end of the payout term?
The balance reaches exactly zero at the end of the payout term, since the formula is built to fully exhaust the lump sum, principal plus all interest earned along the way, across the exact number of payments entered.
Summary
The Annuity Payout Calculator converts a lump sum into a sustainable periodic payment using PMT = PV x i / (1 - (1 + i)^-n). A $250,000 lump sum at 5% annual interest, paid out monthly over 20 years, supports a payment of about $1,649.89 each month, or roughly $395,974 in total payments across the term.
Raising the rate increases the payout; lengthening the term shrinks each individual payment while extending how long income lasts. This is an educational time-value calculation, not a binding insurance quote, and it does not include mortality pricing, fees or lifetime guarantees. Figures shown are estimates only, not financial or retirement advice.