Compound Interest Calculator — Annual Compounding
Annual compounding credits interest once per year, so the annual rate and APY match before fees, taxes, or inflation. Use this page when a CD, bond, savings account, or long-term scenario quotes one annual crediting period. It pre-fills one compound period per year so you can compare the slower baseline against monthly or daily compounding on the same balance, rate, contribution, and time horizon.
Compound interest growth estimate
Estimated future value
$143,489.92
- Starting principal
- $10,000
- Total contributions
- $58,000
- Total interest
- $85,490
Where the balance comes from
Estimate using a fixed annual rate. The principal compounds at the frequency you choose; contributions are grown month by month. Taxes, fees, and inflation are not modeled. An estimate of growth, not investment, tax, or financial advice.
The once-a-year baseline
With annual compounding the formula's n is 1, so interest is figured and added a single time each year. Because there is no intra-year crediting, the effective annual yield equals the nominal rate exactly — a 7% nominal rate stays 7% APY, with none of the frequency boost that lifts monthly compounding to about 7.23%.
This makes the annual page the clean reference point. CDs, bonds, and some savings scenarios are stated on an annual basis, so use this setting when a quoted rate is meant to be taken at face value. Then compare it against the monthly page to see exactly how much more frequent crediting would add on the same balance, contribution, and horizon.
Questions
- Does annual compounding ever change the APY?
- No. With one crediting period a year there is no intra-year growth to compound, so the effective annual yield is identical to the nominal rate you enter. Any APY above the nominal rate comes only from compounding more than once per year.
- When should I pick annual instead of monthly compounding?
- Choose annual when the rate is genuinely an annual figure — many bonds, CDs, and advertised yields are — or when you want the conservative, slowest-growth baseline. Switch to monthly only if the real account actually credits interest each month.
More ways to use this calculator
Start with the main compound interest calculator or compare the other published scenarios.
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