# Annuity Calculator

> Calculate the future value of a fixed annuity investment.

Page: https://askcalculators.com/calculator/annuity-calculator/
Definition: https://askcalculators.com/calculator/annuity-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/annuity-calculator/schema.json
Version: 7.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/annuity-calculator/?initialInvestment=50000&years=20&rate=5.5

## Inputs
- initialInvestment: Initial Investment ($); type=number; optional; default=50000
- years: Growth Period (Years); type=number; optional; default=20
- rate: Annual Interest Rate (%); type=number; optional; default=5.5

## Outputs
- result: Result; format=text; primary

## Formula
Future value = initial investment × (1 + annual rate)^years; interest earned = future value − initial investment.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.