Annuity payout calculator

Calculate equal month-end withdrawals that exhaust a balance over a chosen number of months at a constant return.

On your device · No account

Privacy details

Annuity payout calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Starting balance

Assumed annual return percent

More inputs and assumptions

Monthly withdrawals

Answer

…

Calculate equal month-end withdrawals that exhaust a balance over a chosen number of months at a constant return.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Assumes monthly interest at annual rate ÷ 12, a fixed rate, and payments at month-end. No daily accrual, fees, taxes, insurance, changing rates, or prepayment penalties. The model keeps unrounded balances; schedule rows show cents and may differ slightly from a lender’s rounding. Maximum 1,200 months. This is a deterministic drawdown model, not an insurance quote or a guaranteed sustainable withdrawal rate. Volatile returns and losses can cause a very different outcome.

Automatic precision shows money to two decimal places and other numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Scratch calculator

Check another calculation

Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-26

Using Annuity payout calculator

Calculate equal month-end withdrawals that exhaust a balance over a chosen number of months at a constant return.

Next: Basic calculator

A worked example

With starting balance = 12000, assumed annual return percent = 0, monthly withdrawals = 12, the monthly withdrawal is 1,000.00 (rounded to two decimal places).

Before you use the result

Example results for starting balance

These examples use Assumed annual return percent: 0; Monthly withdrawals: 12. They are reference calculations, not recommended settings.

Starting balance	Monthly withdrawal
6000	500.00
12000	1,000.00
24000	2,000.00

Cite this page

Citation style

ToolOctopus. “Annuity payout calculator.” Updated 2026-09-26. https://tooloctopus.com/annuity-payout-calculator.

Add an access date if your instructions require one.

Citation formatting uses citeproc-js by Frank Bennett and Citation Style Language styles. Licence and source code.