Compound Interest inputs
See how savings and investments can grow over time.
Future value
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Total contributions
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Interest earned
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Finance
Compound Interest Calculator
Calculate future value, total contributions, and interest earned with recurring deposits, annual or monthly rate input, and a term entered in years or months.
Beginner guide
The monthly contribution often matters more than the starting amount
Compound interest is easier to understand if you separate your own money from growth. Total contributions are what you put in. Interest earned is what the growth rate added.
Small recurring deposits can become meaningful because each deposit has time to grow.
- Use annual rate when you are thinking in yearly return terms.
- Use monthly rate only when the product or plan gives you a monthly rate.
- Keep the rate realistic. A higher number can make the future value look better than the plan really is.
Read the table from left to right
The schedule shows how deposits and growth stack up over time. If most of the final balance comes from contributions, saving more matters. If growth becomes larger later, time is doing more of the work.
Formula
Future value combines principal compound growth and monthly contributions compounded monthly.
Example
$5,000 plus $300 per month at 7% for 20 years grows to about $180,000.
Result notes
- Results are estimates based on the values you enter.
- Calculators with schedules show how values change over time.
- For financial, health, or construction decisions, compare these estimates with professional advice when needed.
Frequently asked questions
What compounding frequency is used?
This calculator compounds monthly, which is common for planning estimates.
Is the annual return guaranteed?
No. Investment returns vary and this is only a planning estimate.
Why do small monthly deposits matter?
Recurring deposits create more principal that can compound over time.