High Yield Savings Calculator
Calculate your high-yield savings account (HYSA) earnings with our free calculator. HYSAs offer 10-20x higher interest rates than traditional banks while maintaining full FDIC insurance and easy access to your money—the ideal home for emergency funds and short-term savings.
HYSA vs Traditional Savings (2024)
| Account Type | Typical APY | $10,000 Earns (1 year) | Provider Type |
|---|---|---|---|
| Big Bank Savings | 0.01-0.05% | $1-$5 | Chase, BofA, Wells Fargo |
| Credit Union | 0.10-1.00% | $10-$100 | Local credit unions |
| High-Yield Savings | 4.50-5.25% | $450-$525 | Marcus, Ally, Discover |
| Online-Only HYSA | 4.75-5.30% | $475-$530 | SoFi, Wealthfront, Betterment |
HYSA Growth Projections
| Starting Balance | APY | 1 Year | 3 Years | 5 Years |
|---|---|---|---|---|
| $5,000 | 5.00% | $5,250 | $5,788 | $6,381 |
| $10,000 | 5.00% | $10,500 | $11,576 | $12,763 |
| $25,000 | 5.00% | $26,250 | $28,941 | $31,907 |
| $50,000 | 5.00% | $52,500 | $57,881 | $63,814 |
HYSA Calculator
``javascript
function calculateHYSA(principal, apy, years, monthlyDeposit = 0) {
const monthlyRate = apy / 100 / 12;
const months = years * 12;
let balance = principal;
for (let m = 0; m < months; m++) {
balance = (balance + monthlyDeposit) * (1 + monthlyRate);
}
const totalDeposits = principal + (monthlyDeposit * months);
const interestEarned = balance - totalDeposits;
// Compare to traditional savings (0.05% APY)
const traditionalEarnings = principal * 0.0005 * years;
const hysaAdvantage = interestEarned - traditionalEarnings;
return {
finalBalance: balance.toFixed(2),
interestEarned: interestEarned.toFixed(2),
vsTraditionalSavings: '+$' + hysaAdvantage.toFixed(2),
monthlyInterestAvg: (interestEarned / months).toFixed(2)
};
}
`
Choosing the Best HYSA
Look beyond APY alone. Consider: no monthly fees, no minimum balance requirements, easy transfers to external banks (ACH), mobile app quality, ATM access if offered, and customer service reputation. The top online banks (Marcus, Ally, Discover) consistently offer competitive rates with excellent features.
The Projection Behind This Page
Starting from $10,000, adding $200 a month at 7%:
| Year | Deposited | Balance | Growth | Growth on deposits |
|---|---|---|---|---|
| 1 | $12,400 | $13,201 | $801 | 6% |
| 5 | $22,000 | $28,495 | $6,495 | 30% |
| 10 | $34,000 | $54,714 | $20,714 | 61% |
| 20 | $58,000 | $144,573 | $86,573 | 149% |
After 20 years, 60% of the balance is growth rather than money you
put in. That crossover — the point where returns exceed contributions — is the whole reason
compounding is worth waiting for, and it arrives later than most people expect.The Formula
`
A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) − 1) ÷ (r/n)]
└── initial principal ──┘ └────── regular contributions ──────┘
`
The second term usually dominates. On these numbers the $200 monthly contribution
accounts for the larger share of the final balance, which is the practical lesson: how much
you add matters more than the rate, right up until the balance gets large.
How Long Until It Doubles
The Rule of 72 divides 72 by the rate to estimate doubling time. At 7%:
`
72 ÷ 7 = 10.3 years
`
The exact answer is 10.2 years — the rule is accurate to within a few months
for rates between 6% and 10%, and drifts at the extremes. It works because ln(2) ≈ 0.693 and
72 has convenient divisors.
| Rate | Rule of 72 | Exact |
|---|---|---|
| 2% | 36.0 yr | 35.0 yr |
| 5% | 14.4 yr | 14.2 yr |
| 7% | 10.3 yr | 10.2 yr |
| 10% | 7.2 yr | 7.3 yr |
| 15% | 4.8 yr | 5.0 yr |
Compounding Frequency at This Rate
A nominal 7% turns into a different effective yield depending on how often it
compounds — this page uses daily:
| Compounded | Effective annual yield |
|---|---|
| Annually | 7.000% |
| Quarterly | 7.186% |
| Monthly | 7.229% |
| Daily | 7.250% |
| Continuously | 7.251% |
The gap between annual and monthly is worth having. The gap between monthly and daily is
0.021 percentage points — rounding. Compare accounts on
APY, which already folds the frequency in, rather than on the nominal rate.Inflation Is the Number That Matters
A 7% nominal return against 3% inflation is a 4.0% real return.
Real return is what buys anything:
`
real ≈ nominal − inflation
``
Over 10 years, 3% inflation cuts purchasing power by about 26%. A projection quoted in nominal dollars therefore overstates what the money will actually be worth, which is why retirement targets are usually stated in today's dollars.