When to use this calculator
Estimate the future value of equal end-of-month deposits. Assumes constant monthly compounding and end-of-month deposits. Excludes starting balance, fees and tax.
Explore the savings & interest calculators for other questions in this topic. For a related calculation, use the Growing Perpetuity Calculator: Value an ideal infinite payment stream growing at a constant rate.
PUTTING IT INTO PRACTICE
Future Value of Monthly Deposits: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Monthly deposit | 200 |
| Annual nominal rate (%) | 5 |
| Years | 10 |
| Result | 31,056.455889 currency units |
- Check the input labels and enter the example values above.
- Apply the relationship: Future value = deposit × ((1 + r/1200)^(12y) − 1) ÷ (r/1200).
- The result is 31,056.455889 currency units, rounded for display.
How to interpret your result
Assumes constant monthly compounding and end-of-month deposits. Excludes starting balance, fees and tax.
Match the quoted rate to its compounding convention. A nominal rate, effective annual rate and continuous rate are not interchangeable. Contribution timing also matters when interest is included in a future-value model.
Frequently asked questions
Is a future savings value a forecast?
It is a scenario based on your entered rate and contributions. Changing rates, fees, tax or interrupted payments can change the actual outcome.
How do I use the future value of monthly deposits calculator?
Enter monthly deposit, annual nominal rate (%), years. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Future value = deposit × ((1 + r/1200)^(12y) − 1) ÷ (r/1200).
What should I check before using the result?
Assumes constant monthly compounding and end-of-month deposits. Excludes starting balance, fees and tax.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see OpenStax: compound interest ↗. This is a topic reference, not an external review or endorsement of this tool.
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