Annuity Calculator
See the fixed monthly income a lump sum could provide over a set payout period, and how much of it is interest.
Annuity Calculator
Educational estimate, not financial or tax advice. Returns are never guaranteed. Everything is calculated in your browser.
Runs in your browser — nothing you enter is uploaded or stored.
Scratchpad auto-saved
How it works — in four simple steps
No signup and nothing to install — it all runs in your browser.
Enter the principal
Add the lump sum you'd put into the annuity.
Set rate and period
Enter the annual interest rate and how many years you want the payout to last.
Calculate the payout
See the fixed monthly income, the total paid out, and the interest earned.
Compare scenarios
Adjust the inputs to see how the monthly income changes.
This models a fixed-period payout. Lifetime annuities price in life expectancy, so real quotes will differ.
Features
Turns a lump sum into income
See the fixed monthly payout a principal supports over your chosen payout period at a given rate.
Shows the interest earned
The result breaks out how much you receive in total and how much of that is interest on top of your principal.
Model any scenario
Change the principal, rate or period to compare payouts and find an income that fits your plan.
Private and instant
The annuity math runs in your browser — nothing is uploaded or stored.
About the Annuity Calculator
An immediate annuity turns a lump sum into a stream of fixed payments. You hand over a principal, it earns a steady return, and you receive a regular payout that draws the balance down to zero over the payout period — a way to turn savings into predictable income.
This calculator uses the standard annuity-payout formula to work out the fixed monthly payment a given principal supports at your interest rate over the years you choose, then shows the total paid out and how much of that is interest earned along the way.
It models a simple fixed-term annuity for planning; real annuity products vary in fees, guarantees, inflation adjustments and survivor options. Treat this as an educational estimate, not a quote or advice. It runs entirely in your browser.