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APY Calculator

Compare deposit products on the effective yield produced by compounding.

How the estimate works

APY equals one plus the stated annual rate divided by compounding periods, raised to the number of periods, minus one.

Important limitation

Account fees, balance tiers, and rate changes can reduce realized yield. Results are estimates only and are not financial, lending, legal, tax, or investment advice.

Assumptions and review

Formula review: July 29, 2026. This tool uses only the editable values shown above and does not pull live rates, prices, balances, or account data.

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Frequently asked questions

How does the apy calculator work?

APY equals one plus the stated annual rate divided by compounding periods, raised to the number of periods, minus one.

Is this apy calculator exact?

No. It is a planning estimate based on the values you enter. Actual rates, fees, timing, taxes, and provider rules can change the result.

Can I change the assumptions?

Yes. Every displayed input is editable so you can compare scenarios instead of relying on a hidden default.