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Savings

Compound Interest Calculator

Project investment growth with recurring contributions and configurable compounding. Adjust the example inputs to explore how different assumptions affect the estimate.

Your scenario

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Start with the example values or enter your own assumptions.

Based on your inputs

Your estimate

Future value$171,714.31
Total contributions$82,000.00
Interest earned$89,714.31
Year-by-year balance0: $10,000.00 · 1: $14,317.45 · 2: $18,901.18 · 3: $23,767.64 · 4: $28,934.24 · 5: $34,419.51 · 6: $40,243.10 · 7: $46,425.87 · 8: $52,989.99 · 9: $59,958.96 · 10: $67,357.77 · 11: $75,212.92 · 12: $83,552.56 · 13: $92,406.56 · 14: $101,806.67 · 15: $111,786.55 · 16: $122,381.97 · 17: $133,630.89 · 18: $145,573.62 · 19: $158,252.95 · 20: $171,714.31

Educational estimate only. Actual terms, taxes, fees, and returns may differ.

How to use this calculator

Enter a starting balance, monthly deposit, assumed annual nominal rate, term, compounding frequency, and whether deposits arrive at the start or end of each month.

How the calculation works

Monthly rate = (1 + annual rate ÷ compounding periods)^(compounding periods ÷ 12) − 1. The calculator applies that equivalent monthly rate and adds each monthly contribution at the selected timing.

Worked example

For a $10,000 start and $300 added monthly, changing the assumed rate or the time horizon changes both the earned growth and the total deposits. Try a 0% rate to see contributions without growth.

Assumptions and limitations

Assumes a constant nominal annual rate and regular monthly deposits. It does not model fees, taxes, inflation, variable returns, or missed deposits. Fractional-period conversion is used when the compounding frequency does not align with monthly deposits.

Frequently asked questions

Are returns guaranteed?

No. A constant rate is a scenario input, not a prediction or guarantee.

When are monthly deposits added?

Choose beginning or end of month; beginning deposits receive one additional month of modeled growth.

Sources and further reading

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Educational tool only. It does not provide personalized financial, tax, or legal advice.