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Immediate Annuity Calculator
Estimate the fixed monthly income you could receive from an immediate annuity based on your lump sum, expected rate, and payout period.
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What is an Immediate Annuity?
An immediate annuity converts a lump sum of money into a stream of regular fixed payments, typically monthly, starting right away and continuing for a set period or for life.
The Formula
This calculator uses the standard annuity payment formula: Payment = Principal × (i × (1+i)n) ÷ ((1+i)n – 1), where i is the monthly interest rate and n is the total number of monthly payments over the payout period.
Note: Real annuity quotes from insurers vary by provider, mortality assumptions, and fees; this is a simplified estimate for general educational purposes only.
Last reviewed August 2026