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High-Yield Savings Account Calculator

See exactly how much a HYSA earns at current APY rates — and how much extra interest you leave on the table by staying in a traditional savings account.

Updated July 2026 · Editorial standards

Your balance after 5 years
$46,462
Total interest earned
$6,462
Extra vs traditional
$5,837
Contributions$40,000Monthly interest$183.91APY4.75%

Your savings details

$
$
%
yrs

Key figures

Ending balance
$46,462
Total interest earned
$6,462
Total contributions
$40,000
Extra vs traditional
$5,837
Monthly interest
$183.91

At 4.75% APY with $500/mo contributions, your $10,000 grows to $46,462 in 5 years — earning $6,462 in interest.That's $5,837 more than a traditional 0.5% savings account over the same period.

Balance over time

Balance breakdown

Ending balance
$46,462
By KalkWiseVerified against official sources Updated July 2026

What is the high-yield savings account (hysa) calculator?

In short

A high-yield savings account at 4.75% APY grows $10,000 with $500/month to $47,317 in 5 years — earning $7,317 in interest. At a traditional 0.5% rate the same deposits earn only $750 in interest. The HYSA earns $6,567 more on identical deposits.

Calculates your HYSA's ending balance, total interest earned, and how much extra you earn compared to a traditional savings account at 0.5% APY. Accounts for monthly compounding on both the opening deposit and recurring contributions.

How to use this calculator

  1. 1Enter your starting deposit amount.
  2. 2Set your planned monthly contribution (can be $0 for lump-sum only).
  3. 3Enter your HYSA's current APY — check your bank or a rate-comparison site for today's rate.
  4. 4Set how many years you plan to save.
  5. 5Read the ending balance, total interest, and extra earnings vs a traditional savings account.

The formula

balance=balance×(1+APY12)+C
extra=balance_HYSA−balance_trad
Each month, balance = balance × (1 + r) + C. The HYSA compounds monthly, so the monthly rate is APY ÷ 12. The ending balance is compared against the same math at 0.5% to show the extra earnings.
P
— Initial deposit
C
— Monthly contribution
r
— Monthly rate (APY ÷ 12)
n
— Total months (years × 12)

Worked example

The scenario

$10,000 initial deposit, $500/month, 4.75% APY, 5 years.

gives

The result

Monthly rate = 4.75% ÷ 12 ≈ 0.3958%. After 60 months: balance = $47,317. Total contributions = $40,000. Interest earned = $7,317. Vs traditional (0.5% APY): interest ≈ $750. Extra interest = $6,567.

Common use cases

  • Emergency fund: earn 4–5% on 3–6 months of expenses instead of 0.01% at a big bank.
  • Short-term savings goals (vacation, car down payment, home down payment in 1–3 years).
  • Comparing HYSA vs CD vs I Bond for cash reserves.
  • Calculating how much you leave on the table by keeping money in a traditional checking account.

Limitations & assumptions

  • APY rates are variable — HYSAs change rates when the Fed changes rates. This calculator uses a fixed APY for the entire period.
  • Does not include federal or state taxes on interest earned (add your marginal rate to estimate after-tax yield).
  • FDIC insurance covers up to $250,000 per depositor, per bank — splits across banks if you exceed this.
  • Compounding is monthly; some HYSAs compound daily (slightly higher in practice).

Frequently asked questions

Top online HYSAs are currently offering 4.5%–5.25% APY as of mid-2026. Traditional big-bank savings accounts average 0.01%–0.5%. The gap means $10,000 in a HYSA earns ~$460/yr vs ~$50 at a big bank.

Disclaimer: KalkWise calculators are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Results are estimates based on the figures you enter and the assumptions described above. Actual outcomes will vary. Consult a qualified professional before making financial decisions.