Savings.Calculator
🏦 Yield · 2026

High-Yield Savings Calculator

This calculator shows the dollar amount of interest your high-yield savings account deposits each month. Enter your current balance, the APY your bank advertises, and any monthly contributions. The result is the actual cash that appears in your account, not an annualized percentage but the real number you will see on your statement.

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Interest landing in your account this month

That is a day at APY.

  • The monthly rate behind that APY
  • Twelve of those monthly paymentswhat most people expect the APY to mean
  • A full year on this balancecompounding adds the difference
  • Interest over the next 12 monthsincluding your top-ups
  • Balance in 12 months

APY already includes compounding, which is why twelve monthly credits come to slightly less than the headline figure. Banks can change a savings APY at any time, so this projects today's rate forward rather than promising it.

What Actually Lands in Your Account

Banks advertise APY, which is the annualized return after compounding. But the number that hits your account each month is smaller and depends on how the bank calculates interest. Most high-yield savings accounts compound interest daily and credit it to your balance once a month. On a $12,000 balance at the APY you enter, the calculator converts that annual rate to a daily rate, applies it across the days in the month, and shows the resulting deposit. At an illustrative 4.5% APY, that comes to roughly $45 in the first month. The number inches up each subsequent month because each interest credit raises your balance slightly, and future interest is calculated on the new, higher total. This compounding-on-compounding effect is exactly why APY differs from a simple flat percentage. The calculator makes that daily math visible without requiring you to reverse-engineer your bank statement.

APY Confusion and What to Watch For

Savers on personal-finance forums often ask why their monthly interest does not match a simple division of the APY. If your bank pays 4.5% APY and you divide by 12, you get 0.375% per month, or $45 on $12,000. The actual monthly credit is close to that figure but not identical because daily compounding involves 28 to 31 daily calculations rather than one clean monthly split. The difference for most balances is a matter of cents, not dollars. Where it matters more is when you compare two accounts. A bank advertising 4.50% APY and one advertising 4.50% APR are offering slightly different returns. APY already accounts for compounding, while APR does not. The APY-to-APR converter in the related tools section can help you compare offers on equal footing. Focus on the APY when evaluating accounts. It is the figure designed for direct comparison and the one federal regulations require banks to disclose on deposit products.

APY changes at the bank's discretion. The rate you enter today may differ next month. Revisit the calculator whenever your bank adjusts its rate.

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Sources

    APY definition: Annual Percentage Yield, accounting for compound interest. Formula: APY = (1 + APR/n)^n - 1.
  • Annual percentage yield formula — Truth in Savings Act, Regulation DD, 12 CFR Part 1030, Appendix A (Consumer Financial Protection Bureau).
  • Compound interest and annuity formulas — standard financial mathematics; every figure is computed from the inputs you enter.