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Compound Savings Calculator
Estimate how an initial deposit, regular monthly contributions and compound interest can grow your savings over time.
Compare your total contributions with projected interest and follow the balance year by year.
Instant projection Yearly growth chart No sign-up
Calculator
Project your compound savings
Enter your balance, planned deposits, rate and timeline to see an educational savings projection.
Savings growth over time
Projected balance compared with the amount contributed.
BalanceContributions
Year-by-year projection
Calculations keep full precision internally. Displayed currency values are rounded for readability.
| Year | Total contributions | Interest earned | End balance |
|---|---|---|---|
| 0 | $10,000 | $0 | $10,000 |
| 1 | $16,000 | $651 | $16,651 |
| 2 | $22,000 | $1,642 | $23,642 |
| 3 | $28,000 | $2,991 | $30,991 |
| 4 | $34,000 | $4,716 | $38,716 |
| 5 | $40,000 | $6,837 | $46,837 |
| 6 | $46,000 | $9,372 | $55,372 |
| 7 | $52,000 | $12,345 | $64,345 |
| 8 | $58,000 | $15,776 | $73,776 |
| 9 | $64,000 | $19,690 | $83,690 |
| 10 | $70,000 | $24,111 | $94,111 |
Savings basics
What is a compound savings calculator?
A compound savings calculator estimates how deposits and accumulated interest may grow across a chosen period.
Starting savings
The amount already saved begins earning interest from the start.
Regular contributions
Monthly deposits increase the balance that can earn future interest.
Compound growth
Interest is added to the balance so future interest can be earned on prior interest.
How compound interest is calculated
Compound growth depends on the principal, annual rate, compounding frequency, time and contribution schedule.
A = P(1 + r/n)nt
In the standard formula, A is the future amount, P is the principal, r is the annual interest rate, n is the number of compounding periods per year and t is time in years. Regular monthly contributions are modeled separately according to whether they are added at the beginning or end of each month.
Starting savings$10,000
Monthly contribution$500
Annual rate5%
CompoundingMonthly
Savings period10 years
Estimated future balanceAbout $94,111
What affects compound savings growth?
Time
A longer savings period gives interest more opportunities to compound.
Interest rate
A higher rate increases growth when all other assumptions stay the same.
Contribution amount
Larger or more frequent deposits increase the balance available to grow.
Compounding frequency
More frequent compounding can slightly increase the effective annual return.
Why regular contributions matter
Consistent deposits add new principal throughout the savings period. Even when the interest rate stays the same, increasing a monthly contribution can have a large effect because every deposit can earn interest during the time it remains in the account.
Beginning-of-month deposits receive one more month of projected growth than end-of-month deposits. Choose the timing that most closely matches your actual plan.
Nominal rate and effective growth
The stated annual rate is divided across the selected compounding periods. The calculator converts that schedule into an equivalent monthly rate so monthly deposits can be modeled consistently.
Use the rate and compounding frequency shown by the savings provider. APY already includes compounding, so entering an APY as a nominal rate may produce a different estimate.
Frequently asked questions
What is compound interest?
Compound interest is interest calculated on both the money you contribute and interest already added to the balance. Over time, earning interest on prior interest can accelerate savings growth.
How does this compound savings calculator work?
The calculator converts the annual rate and selected compounding frequency into an equivalent monthly rate. It then models each monthly contribution and interest period across the savings term.
What is the difference between simple and compound interest?
Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus previously earned interest.
How often should interest be compounded?
Use the frequency stated by your bank or savings provider. With the same stated annual rate, more frequent compounding generally produces a slightly higher effective annual yield.
When should monthly contributions be added?
Choose the beginning of the month if deposits are made before that month’s interest accrues, or the end of the month if deposits are made afterward. Beginning-of-month contributions have one additional month to grow.
Can I use the calculator for currencies other than USD?
Yes. You can format results in USD, GBP, EUR, CAD, AUD, PKR, MYR or INR. Currency selection changes formatting only and does not convert values.
Does the estimate include taxes, fees or inflation?
No. The projection does not subtract taxes, account fees or inflation. Those factors can reduce actual returns and purchasing power.
Is the projected savings balance guaranteed?
No. The result is an educational estimate based on a constant rate and regular contributions. Actual savings rates, deposits, withdrawals, fees and taxes may differ.
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Educational estimate
This calculator is for general information only and does not provide financial, investment, tax or legal advice. Results assume a constant rate and regular deposits and do not include taxes, fees, withdrawals or inflation. Actual savings outcomes may differ.