Compound Wealth & APY Accelerator

High-Yield Savings & Compound Interest Calculator

Forecast your exponential wealth accumulation. Model recurring contributions, examine daily compounding yields, and benchmark HYSA earnings against standard 0.01% big-bank savings.

Deposit & Contribution Inputs

Set your initial starting capital, ongoing deposits, and interest yield

Starting balance
$
Ongoing deposit
$
4.0% - 5.0% modern HYSA
%
Savings timeframe
Daily standard for US HYSAs
Benchmark vs. Big-Bank (0.01% APY)
Show difference compared to traditional low-rate checking/savings
Projected Future Balance
$91,315
Projected balance after 10 years @ 4.5% APY (Daily Compounding)
Deposit: $10,000
Contributions: $60,000
Interest: $21,315
Total Principal Saved
$70,000
Your out-of-pocket cash
Total Compound Interest
$21,315
23.3% of Total Balance
Avg Monthly Yield
$178/mo
Average passive income
Effective Multiplier
1.30x
Growth on deposits
HYSA Wealth Advantage: +$21,277
A traditional big-bank savings account paying 0.01% APY would yield only $38 in interest over 10 years. Storing your reserves in a 4.5% HYSA compounds +$21,277 in extra passive wealth.

Year-by-Year Wealth Amortization Schedule

Track principal contributions, annual interest compounding, and balance trajectory.

Period Starting Balance Annual Deposits Interest Earned Ending Balance
Compound Wealth Insights

Frequently Asked Questions

Clear explanations of APR vs. APY, compounding frequency, and FDIC principal safety.

What is the difference between APR and APY in savings accounts?

The distinction between APR (Annual Percentage Rate) and APY (Annual Percentage Yield) is crucial when evaluating savings accounts:

  • APR: The simple, uncompounded interest rate paid over a year. It ignores the compounding effect of interest earning interest.
  • APY: The effective annual rate of return that accounts for intra-year compounding (e.g., daily or monthly). Because earned interest is continually added back to your balance to generate further returns, APY is always slightly higher than APR.

For example, an account with a 4.41% nominal APR compounded daily delivers an effective 4.50% APY.

How does compounding frequency (daily vs. monthly vs. annually) impact long-term returns?

Compounding frequency determines how often earned interest is credited to your principal balance to begin generating its own interest:

  • Daily Compounding: Interest is calculated every single day on your end-of-day balance and credited monthly. This is the gold standard for top US online high-yield savings accounts.
  • Monthly / Quarterly Compounding: Interest is calculated less frequently, resulting in marginally lower total compound interest over time.
  • Long-Term Compounding Effect: While the difference between daily and monthly compounding on a small balance over one year is modest, over 10 to 30 years with ongoing contributions, daily compounding accelerates total wealth accumulation by hundreds or thousands of dollars.
Are High-Yield Savings Accounts (HYSA) safe and FDIC-insured?

Yes. Reputable online High-Yield Savings Accounts are backed by federal government insurance:

  • FDIC Insurance: Up to $250,000 per depositor, per insured institution, for each account ownership category at member banks.
  • NCUA Insurance: The exact same $250,000 statutory federal protection for accounts held at federal credit unions.
  • Zero Principal Volatility: Unlike stock market investments or mutual funds, your cash balance in an FDIC-insured HYSA cannot decline in value regardless of economic turbulence.