High-Yield Savings (HYSA) Interest Calculator
Compare what your savings would earn in a high-yield account versus a traditional one: same deposits, same timeline, side by side.
Typical top HYSA rates were around 4% in mid-2026 — check your bank
Big-bank default savings rates often sit under 0.5%
High-yield balance
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Traditional balance
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High-yield advantage
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Enter a deposit or monthly amount
The easiest raise in personal finance
Most savings advice asks you to spend less or earn more. Moving idle cash to a high-yield account does neither; it just stops donating interest to a bank that wasn't paying for it. On a $15,000 emergency fund, the gap between a sub-0.5% rate and a competitive one is hundreds of dollars a year for the same risk profile.
Where it fits in the plan
The HYSA is the natural home for the emergency fund and short-term goals: liquid, insured, and roughly keeping pace with inflation (check the erosion math in the inflation calculator). It is not a wealth-building engine; long-horizon money typically belongs in investments, where compounding does the heavy lifting.
The habit that outlasts the rate
Rates move. The people who consistently earn the competitive rate aren't predicting anything; they just notice when their rate drifts below the market and move. Noticing is the hard part when accounts live in five different apps, which is exactly the visibility Stoia is being built to provide: every account, every rate-bearing balance, one picture.
Frequently asked questions
What is a high-yield savings account?
A savings account, usually from an online bank, paying many times the interest of a traditional branch bank's default savings account. Same FDIC insurance up to the standard limits, same liquidity; the difference is mostly that online banks compete on rate.
Are HYSAs safe?
Deposits at FDIC-member banks are insured up to $250,000 per depositor, per bank, per ownership category, the same protection a branch bank has. Check for FDIC membership (or NCUA for credit unions) before opening anything.
Why are big-bank savings rates so low?
Because they can be. Branch banks pay for real estate and count on customer inertia; online banks pass those savings into the rate to win deposits. Moving is usually a 15-minute task with an outsized payoff.
Is the APY guaranteed?
No. Savings APYs float with the interest-rate environment and can change at any time. That cuts both ways; the comparison habit matters more than any single rate snapshot.
What money belongs in a HYSA?
Money that needs to stay safe and reachable: your emergency fund, a house down payment you'll use within a few years, sinking funds for known expenses. Long-horizon money generally works harder invested; see the compound interest calculator for that math.
Does this calculator save my numbers?
No. Everything runs in your browser and disappears when you leave. Nothing is uploaded or stored.
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