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Compound Savings Calculator
See how a starting deposit and regular monthly deposits grow with compound interest. Enter your numbers and press Calculate to watch the balance build.
Written by TopicDrill Editorial Team·Updated June 2026
Balance over time
Balance Deposited
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How compound savings works
Compounding means you earn interest on your interest. The calculator simulates each month, adding your deposit and applying the rate, so a starting balance and steady contributions grow together. The chart above shows the gap between what you put in, the dashed line, and what the account is worth, the shaded area. That gap is the interest doing the heavy lifting.
The longer your money stays invested, the steeper the curve becomes, because the balance earning interest keeps getting larger. This is why starting early, even with small amounts, often beats starting later with bigger amounts.
A quick example
Start with $5,000, add $250 a month at a 4.5% APY for 15 years. You would deposit $50,000 of your own money over that time, yet the balance grows to roughly $69,000. The extra is interest, including interest earned on earlier interest.
Things to keep in mind
Real savings rates change over time and may not match the figure you enter. This tool ignores taxes and inflation, which both reduce real returns. For guidance on saving and accounts, the Consumer Financial Protection Bureau is a trusted source. Compare scenarios with our compound interest calculator.
Frequently asked questions
How does compound savings grow?
Each period your balance earns interest, and that interest then earns interest of its own. When you also add regular deposits, the growing balance and your new money compound together, which is why savings accelerate the longer you leave them invested.
What is APY and how is it different from the interest rate?
APY, the annual percentage yield, already includes the effect of compounding within the year. A nominal rate compounded monthly produces a slightly higher APY. Enter the rate your account quotes and pick the matching compounding frequency for the closest result.
Does how often interest compounds matter?
Yes, but less than people expect. Daily compounding earns a bit more than annual compounding at the same nominal rate, though the gap is small. The size of your deposits and the number of years matter far more than the compounding frequency.
How much should I keep in savings?
A common guideline is three to six months of essential expenses in an emergency fund held in a safe, liquid account. Money you will not need for many years can often work harder in longer-term investments, which carry more risk but higher expected returns.
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