Formula and calculation method
Future annuity value = deposit × [(1 + monthly rate)^months − 1] / monthly rate.
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
How to use annuity calculator
- Set End-of-month deposit. The example below uses 500.
- Set Annual interest rate (%). The example below uses 6.
- Set Term (years). The example below uses 10.
- Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.
Worked example
Example inputs
- End-of-month deposit
- 500
- Annual interest rate (%)
- 6
- Term (years)
- 10
- Annuity future value
- 81,939.67340323
- Total contributions
- 60000
Factors affecting your result
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
Changing end-of-month deposit changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.
Frequently asked questions
How does the annuity calculator work?
Future annuity value = deposit × [(1 + monthly rate)^months − 1] / monthly rate.
What inputs does Annuity Calculator need?
Enter end-of-month deposit, annual interest rate (%), term (years). Read the unit labels; percentages are entered as ordinary percentages, not decimal fractions.
How should I interpret the annuity calculator result?
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
Are my annuity calculator inputs uploaded?
No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.
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