Savings Comparison
Compare interest earnings from different savings accounts & banks. See which account maximizes returns on your money. Find the best savings rate available.
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Savings Calculator
Enter your deposit amount and annual percentage yield to see exactly how your savings grow over 1, 3, 5, and 10-year horizons — with a full breakdown of interest earned, compounding effect, and the real purchasing power of your savings after inflation.
How to Use This Tool (30 Seconds)
- 1Enter Your Deposit Amount: Input the lump-sum amount you are depositing or currently have in savings. This is your starting principal — the amount that begins compounding immediately. For ongoing savings accounts, enter your current balance rather than your initial deposit for the most accurate projection of where your money will be at each time horizon.
- 2Enter the Annual Percentage Yield: Input the APY — Annual Percentage Yield — offered by your savings account, CD, or money market account. APY already accounts for compounding frequency, making it the correct figure for growth projections. Find APY on your bank's product page or account statement — it is always equal to or higher than the stated interest rate. Do not use the nominal interest rate if APY is available.
- 3View Your Savings Growth: The tool calculates your balance at 1, 3, 5, and 10-year milestones — showing total balance, interest earned, and compounding gain at each point. The results reveal how dramatically compounding accelerates growth in later years compared to early years on the same deposit.
- 4Compare Across APY Scenarios: Re-enter the same deposit amount at different APY rates to compare savings products — for example, a 0.5% traditional savings account versus a 5.0% high-yield savings account. The interest difference at 10 years is the clearest financial argument for switching to a higher-yield account.
The Compound Interest Formula Behind Your Savings Growth
Because APY already incorporates compounding frequency, the growth calculation uses the annual compound interest formula directly — no monthly rate conversion required:
// APY-based compound growth formula
balance_N = principal × (1 + APY ÷ 100)^N
interestEarned_N = balance_N − principal
// Compounding acceleration — interest on interest
simpleInterest_N = principal × (APY ÷ 100) × N
compoundingGain_N = interestEarned_N − simpleInterest_N
// Real value after inflation (Rule of 72 variant)
realAPY = APY − inflationRate (approx 3.0% historical avg)
realBalance_N = principal × (1 + realAPY ÷ 100)^N
// Example: $10,000 at 5.0% APY
Year 1: $10,500 | interest: $500 | compounding gain: $0
Year 3: $11,576 | interest: $1,576 | compounding gain: $76
Year 5: $12,763 | interest: $2,763 | compounding gain: $263
Year 10: $16,289 | interest: $6,289 | compounding gain: $1,289
The compounding gain column is the most important figure the formula produces. At year 1, compounding has contributed nothing beyond simple interest. By year 10 at 5% APY, $1,289 of the $6,289 earned is interest on previously earned interest — money that exists solely because of time in the account, requiring no additional deposit. This compounding acceleration explains why financial planners emphasize time in account over deposit amount as the primary lever for savings growth.
Savings Growth Reference — $10,000 Across APY Rates and Time
| APY | Account Type | Balance at 5yr | Balance at 10yr | Interest at 10yr |
|---|---|---|---|---|
| 0.5% | Traditional bank savings | $10,253 | $10,511 | $511 |
| 1.0% | Credit union savings | $10,510 | $11,046 | $1,046 |
| 2.5% | Online savings account | $11,314 | $12,801 | $2,801 |
| 4.5% | High-yield savings (HYSA) | $12,462 | $15,530 | $5,530 |
| 5.0% | Top-tier HYSA / 1yr CD | $12,763 | $16,289 | $6,289 |
| 5.5% | 12–18 month CD (2024) | $13,070 | $17,081 | $7,081 |
Balances calculated using APY-based annual compounding on a $10,000 lump-sum deposit with no additional contributions. APY rates reflect 2024 US market averages sourced from FDIC rate survey data and Bankrate's weekly high-yield savings tracker. Rates are variable and change with Federal Reserve policy.
⚡ Pro Tip
Run this calculator with 0.5% APY — the average rate still offered by the four largest US banks on standard savings accounts — then re-run it at 4.5–5.0% APY from a high-yield savings account. On a $10,000 deposit over 10 years, the difference is $511 versus $5,530 in interest earned — a $5,019 gap from a single account switch that takes 10 minutes and has no downside risk, no lock-in period, and FDIC insurance identical to a traditional bank. The rate difference between a traditional savings account and a top-tier HYSA is the highest-return, zero-risk financial action available to most savers — yet fewer than 20% of US households with savings accounts have made the switch according to FDIC deposit data.
Disclaimer: This tool is for informational purposes only and does not constitute financial advice. APY rates on savings accounts and money market accounts are variable and change with Federal Reserve monetary policy. CD rates are fixed for the specified term but vary at renewal. Projections assume a constant APY throughout the calculation period. FDIC insurance covers deposits up to $250,000 per depositor per institution. Consult a certified financial planner for personalized savings strategy guidance.
Frequently Asked Questions
Q: What is the difference between APY and interest rate for savings accounts?
The interest rate is the base rate applied to your balance before compounding frequency is factored in. APY — Annual Percentage Yield — reflects the actual annual return after compounding is applied, whether monthly, daily, or quarterly. A 4.85% interest rate compounded daily produces an APY of 4.97%. Always use APY for savings growth projections because it reflects what your balance actually grows to in 12 months — the interest rate alone understates growth for accounts that compound more frequently than annually.
Q: How does compounding frequency affect savings growth?
More frequent compounding produces higher effective returns than the stated rate alone. Daily compounding — used by most high-yield savings accounts — earns marginally more than monthly compounding at the same APR. However, because APY already incorporates compounding frequency, two accounts with identical APY produce identical balances at every time horizon regardless of their compounding schedules. APY is the correct normalized metric precisely because it eliminates compounding frequency as a confounding variable.
Q: What APY should I realistically expect from a savings account in 2024?
Traditional savings accounts at major national banks offer 0.01–0.50% APY — far below inflation. Online high-yield savings accounts from institutions like Marcus, Ally, and SoFi offer 4.5–5.2% APY as of 2024, tracking the Federal Reserve's benchmark rate. 12-month CDs offer 5.0–5.5% APY with a fixed rate for the term. The spread between traditional and high-yield savings is at a historical high — making account selection unusually impactful in the current rate environment.
Q: Does inflation reduce the real value of my savings growth?
Yes — inflation erodes purchasing power regardless of nominal interest earned. At 3% inflation and 0.5% APY, your real APY is approximately −2.5% — your balance grows in dollar terms but shrinks in purchasing power. At 5.0% APY and 3% inflation, real APY is approximately 2% — you gain genuine purchasing power. Breaking even against inflation requires an APY at or above the current inflation rate, which only high-yield savings accounts and CDs consistently achieve at 2024 rate levels.
Q: Is a high-yield savings account safe for large deposits?
Yes — FDIC insurance covers deposits up to $250,000 per depositor per FDIC-insured institution, regardless of whether the institution is a traditional bank or an online bank. Most high-yield savings accounts are offered by FDIC-insured institutions. Deposits above $250,000 can be protected by spreading them across multiple FDIC-insured institutions or using joint account structures that double the coverage limit to $500,000 per institution.
Q: Should I choose a high-yield savings account or a CD for better returns?
CDs offer slightly higher APY than savings accounts — typically 0.2–0.5% more — but lock your deposit for a fixed term ranging from 3 months to 5 years. Early withdrawal penalties typically forfeit 3–6 months of interest. High-yield savings accounts offer full liquidity with no penalty. If you have a specific savings goal with a known time horizon and will not need the funds before maturity, a CD captures a higher locked-in rate. For emergency funds or flexible savings, a high-yield savings account is the correct choice.
Q: How much does the Rule of 72 predict for doubling time?
The Rule of 72 estimates how long it takes savings to double: divide 72 by the APY. At 5% APY, your money doubles in approximately 14.4 years. At 1% APY, doubling takes 72 years. At 0.5% — the average traditional bank savings rate — doubling takes 144 years, which exceeds a human lifespan. This single comparison from the Rule of 72 is the most compelling argument for immediately moving savings from low-yield traditional accounts to high-yield alternatives, as the doubling timeline difference between 0.5% and 5.0% APY is 130 years.