Simple Savings Calculator
Free simple savings calculator. Estimate how much your savings will grow with a basic interest rate and regular deposits over any time period.
Compound Savings Calculator
Free compound savings calculator. See how your savings grow with compound interest and regular contributions over time with detailed growth charts.
$
$
%
Final Savings Balance
$83,717.50
Total Contributions⧉
$65,000.00
Principal + all deposits
Interest Earned⧉
$18,717.50
22.4% of final balance
Effective APY⧉
0.05%
From 0.05% nominal rate
Interest-to-Contribution⧉
31.2%
Interest as % of deposits made
Year-by-Year Growth
| Year | Balance | Contributions | Interest Earned |
|---|---|---|---|
| 0 | $5,000.00 | $5,000.00 | $0.00 |
| 1 | $11,378.00 | $11,000.00 | $378.00 |
| 2 | $18,049.00 | $17,000.00 | $1,049.00 |
| 3 | $25,026.00 | $23,000.00 | $2,026.00 |
| 4 | $32,324.00 | $29,000.00 | $3,324.00 |
| 5 | $39,958.00 | $35,000.00 | $4,958.00 |
| 6 | $47,942.00 | $41,000.00 | $6,942.00 |
| 7 | $56,292.00 | $47,000.00 | $9,292.00 |
| 8 | $65,027.00 | $53,000.00 | $12,027.00 |
| 9 | $74,162.00 | $59,000.00 | $15,162.00 |
| 10 | $83,717.00 | $65,000.00 | $18,717.00 |
Planning notes, formulas, and examples
About the Compound Savings Calculator
The Compound Savings Calculator shows you exactly how your money grows when interest earns interest over time. Enter your starting balance, regular contributions, interest rate, and time horizon to see a detailed projection of your savings balance year by year. This is the core tool for anyone building wealth through disciplined saving.
Compound interest is often called the eighth wonder of the world because it transforms small, consistent deposits into substantial sums given enough time. A savings account earning 4.5% APY with monthly contributions of $500 can grow to over $73,000 in just 10 years, with more than $13,000 coming from interest alone.
Whether you are saving for a down payment, building an emergency fund, or simply growing your nest egg, this calculator gives you a realistic picture of what to expect. Adjust the compounding frequency to match your account type and see how daily, monthly, or quarterly compounding affects your results.
When This Page Helps
Understanding compound growth motivates consistent saving. When you see how dramatically your balance accelerates in later years thanks to compounding, it becomes easier to stay disciplined with contributions. This calculator also helps you compare savings accounts by showing the real dollar difference between APY rates over your time horizon. Even a small APY advantage compounds into a meaningful dollar difference over your full savings horizon.
How to Use the Inputs
- Enter your current savings balance (starting principal).
- Enter a regular contribution amount and select the frequency (monthly, quarterly, annually).
- Enter the annual interest rate or APY offered by your savings account.
- Select the compounding frequency (daily, monthly, quarterly, or annually).
- Enter the number of years you plan to save.
- View the projected balance, total contributions, and interest earned.
- Review the year-by-year growth table to see how compounding accelerates over time.
Formula used
FV = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) – 1) / (r/n)]
where P = principal, r = annual rate, n = compounding periods per year, t = years, PMT = periodic contribution
Interest Earned = FV – P – (PMT × total contributions)
Effective APY = (1 + r/n)^n – 1Example Calculation
Result: Final balance: $79,717
Starting with $5,000 and adding $500 monthly at 4.5% APY compounded monthly, after 10 years you have $79,717. Total contributions are $65,000 ($5,000 + $500 × 120 months). Interest earned is $14,717. Note how interest accelerates in later years as the base balance grows larger.
Tips & Best Practices
- Even small increases in APY make a big difference over long time horizons due to compounding.
- Set up automatic transfers to ensure contributions happen consistently each month.
- High-yield savings accounts currently offer 4–5% APY, far above the national average of 0.45%.
- Daily compounding earns slightly more than monthly, but the difference is small at typical savings rates.
- Increase your contribution amount whenever you get a raise to accelerate savings growth.
- Use this calculator alongside the savings goal calculator to determine the required contribution for a specific target.
The Power of Starting Early
Time is the most powerful factor in compound growth. Starting to save $300 per month at age 25 versus age 35 can mean a difference of over $100,000 by age 65, even with identical contribution amounts and interest rates. The extra decade of compounding does the heavy lifting, which is why financial advisors emphasize starting as early as possible.
Compounding Frequency Explained
Daily compounding calculates interest on your balance every day, while monthly compounding does so once per month. At a 4.5% annual rate, daily compounding produces an effective APY of 4.603% versus 4.594% for monthly compounding. The difference is minimal for savings accounts but becomes more significant at higher rates or over very long periods.
Making the Most of Compound Savings
Maximize your compound growth by choosing a high-yield savings account with a competitive APY, making regular contributions through automatic transfers, and avoiding unnecessary withdrawals that interrupt the compounding cycle. Treat your savings contributions as a non-negotiable expense, just like rent or utilities, and watch the power of compounding work in your favor.
Sources & Methodology
Last updated:
Methodology
This worksheet applies standard time-value-of-money math for deposits and cash savings. Depending on the page, it solves for future value, required monthly contribution, time to goal, withdrawal runway, or the effect of inflation on nominal savings. It is a planning aid, not a guarantee of account performance.
The result assumes the stated rate, compounding frequency, and contribution schedule remain unchanged unless the page says otherwise.
Sources
- Compound interest (Consumer Financial Protection Bureau) — Compound-interest and APY concept context.
- Consumer Price Index (U.S. Bureau of Labor Statistics) — Inflation context for real-return calculations.
- Saving and managing your money (FDIC) — Savings-account and deposit-planning context.
Frequently Asked Questions
Compound interest is interest calculated on both the initial principal and all accumulated interest from previous periods. Unlike simple interest (which only applies to the principal), compound interest causes your balance to grow exponentially over time because you earn interest on your interest.
Most savings accounts compound interest daily or monthly. Daily compounding earns slightly more than monthly compounding at the same APY, but the difference is typically small. The APY (Annual Percentage Yield) accounts for compounding frequency, making it the best rate to compare across accounts.
APR (Annual Percentage Rate) is the simple interest rate without compounding. APY (Annual Percentage Yield) includes the effect of compounding. For savings accounts, APY is always equal to or higher than APR. When comparing savings accounts, always use APY for an accurate comparison.
A common guideline is the 50/30/20 rule: 50% of income for needs, 30% for wants, and 20% for savings and debt repayment. However, any consistent amount is better than nothing. Use this calculator to see how even $100 or $200 per month grows significantly over time.
This calculator shows pre-tax growth. Interest earned in taxable savings accounts is subject to federal and state income tax. For a more accurate picture, reduce the APY by your marginal tax rate. For example, 4.5% APY at a 24% tax rate effectively yields about 3.42% after tax.
The interest rate on most savings accounts is variable, meaning the bank can change it at any time. Only CDs and fixed-rate products lock in a rate. This calculator assumes a constant rate for simplicity. Actual results will vary as rates change over your savings period.
More frequent compounding (daily > monthly > quarterly > annually) produces slightly higher returns at the same stated rate. However, when comparing accounts by APY, the compounding effect is already factored in. At 4.5% APY, the final balance is the same regardless of compounding frequency.
Inflation reduces the purchasing power of your future balance. If your savings earn 4.5% and inflation runs at 3%, your real growth is only about 1.5%. Use the inflation impact on savings calculator to see how much of your growth is consumed by rising prices.
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