Growing Annuity Calculator

Written by Great Medico

Updated September 25, 2026 •3 min read

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A financial result is only as useful as the inputs behind it. Growing Annuity Calculator projects the future value of a payment stream that grows by the entered annual growth rate while the balance earns the entered annual return, so you can test the scenario with numbers that match your own situation.

What this calculator does

Growing Annuity Calculator projects the future value of a payment stream that grows by the entered annual growth rate while the balance earns the entered annual return. The visible form contains Payment timing, Annuity payment, Annual interest rate, Annuity term, Payment frequency, Payment growth rate. These are the inputs that define this calculator’s scope. If a value, rule, or adjustment is not represented by a working field, it should not be assumed to be included in the result.

How to use it

Enter Payment timing, Annuity payment, Annual interest rate, Annuity term, Payment frequency, then complete the remaining displayed fields: Payment growth rate. Enter percentage or rate fields on the scale shown by the form rather than converting them to decimals yourself. Keep monetary inputs in the same currency, or use the currency selector when one is provided. Keep time and payment-frequency assumptions consistent with the labels on the page. Before calculating, recheck Payment timing and the other values that materially affect the result. For a clean comparison, hold the other inputs constant while changing one assumption at a time so you can see what is driving the result.

How the calculation works

The calculator steps through each payment period, grows the account at the periodic return, and increases the payment after each year by the entered payment-growth rate. This is the calculation method that should anchor any manual check of the output. If a displayed field does not affect the current calculation, that limitation is stated below rather than silently treating the field as part of the formula.

Example

With the displayed example values (Payment timing = ordinary, Annuity payment = 1,000, Annual interest rate = 5, and Annuity term = 10) and the remaining defaults unchanged, the current calculator returns $169,355.33 for future value of annuity payments. Replacing those defaults with your own values recalculates the same relationship; change one input at a time if you want to see which assumption is driving the difference.

How to interpret the result

The result is sensitive to both return and payment growth. When contributions rise over time, later payments are larger but have fewer periods to compound than earlier contributions. Compare results produced from the same definitions and time period. A mathematically larger or smaller number is not automatically better unless the financial context makes that direction meaningful.

Limitations and notes

The model assumes regular payment timing and smooth annual payment growth. Taxes, fees, skipped contributions, irregular increases, and changing returns are not included unless represented by the fields. Where the calculator depends on estimates, rates, accounting classifications, or future behavior, test more than one plausible scenario before making a decision.