How to use the annuity calculator
Prepare the values for this calculation
Calculate present or future value of an ordinary annuity with end-of-period payments. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Calculate: choose Future value, Present value. Match this selection to the data you enter.
- Periodic payment: enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
- Annual nominal rate (%): enter a value at least -99 and no more than 1000. Use the unit named in the label or selected above. Do not leave this required field blank.
- Years: enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
- Compounds / payments per year: choose Annual, Semiannual, Quarterly, Monthly, Daily. Match this selection to the data you enter.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Annuity value first. With the unchanged example inputs, it is $231,020.45. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Periodic payment from 500 to 550. The resulting Annuity value is $254,122.49. This illustrates the equation’s response to that input, rather than a forecast of real events.
Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Annuity Calculator formula
FV = PMT×((1+r)^n−1)/r; PV = PMT×(1−(1+r)^−n)/r.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Calculate | Select an option | Future value |
| Periodic payment | minimum 0 | 500 |
| Annual nominal rate (%) | minimum -99; maximum 1000 | 6 |
| Years | minimum 0 | 20 |
| Compounds / payments per year | Select an option | Monthly |
Worked example
Using the example inputs above, the annuity value is $231,020.45.
- Annuity value
- $231,020.45
- Mode
- Future value of ordinary annuity
Results and assumptions
The output uses the annuity value convention and formula shown above. Match the entered units and source assumptions when comparing results.
Rates, fees and tax assumptions are entered values. This calculation does not quote a lender, determine a tax liability or guarantee an investment return.
Fix an input or unexpected result
Periodic payment is required. Enter periodic payment using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.