Does compounding frequency make much difference?

Less than people expect. 10,000 at 7% for ten years grows to 19,672 compounded annually and 20,097 compounded monthly. The rate and the number of years matter far more.

What rate should I use?

Whatever you are actually offered for a savings account or bond. For investments there is no correct answer, because returns vary and can be negative. Try a range rather than treating one figure as a forecast.

Does this account for inflation?

No. Every figure is in today's money at face value. To see a rough real return, enter the rate minus expected inflation instead of the nominal rate.

Are taxes and fees included?

No. Both reduce the result, sometimes substantially over long periods. A 1% annual fee on a 7% return removes far more than a seventh of the growth, because the money removed would itself have compounded.

Compound Interest Calculator

See what a starting amount plus regular contributions grows into.

Built by AbhiLast reviewed September 19, 2026

Result

Ending balance: $20,096.61Estimate

Growth makes up 50.2% of the ending balance.

A constant return is an assumption, not a forecast. Nothing here models tax, fees, inflation or a rate that changes, so every figure is an estimate.

Total you put in: $10,000.00
Growth: $10,096.61Estimate
Ending balance as a multiple of deposits: 2.01Estimate

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Results are arithmetic estimates based on the values you enter. Rates, fees and terms are set by your lender or provider, and your actual agreement controls what you pay or receive. Confirm important figures with them or with a qualified adviser. Read the full disclaimer

How to use the Compound Interest Calculator

Enter what you are starting with, or zero if you are starting from nothing.
Enter the annual rate and how often it compounds.
Add a regular contribution and its frequency if you intend to keep paying in.

Growth on growth

Simple interest pays only on the original amount. Compound interest pays on the balance, so each period’s interest earns interest of its own from then on. Over a few years the difference is small; over decades it dominates.

A = P × (1 + r ÷ n)^(n × t)P = starting amount        r = annual raten = compounding periods    t = years

The exponent is why time matters more than anything else here. 2,000 at 8% becomes about 22,000 after thirty years, and nearly all of that is growth on growth rather than on the original 2,000.

Contributions are handled at their own frequency

Money paid in monthly into an account that compounds daily is not a daily deposit, and treating it as one overstates the result. The calculator converts the rate to the contribution interval before applying it, so the two frequencies can differ without distorting the answer.

Contributions are assumed to arrive at the end of each interval. Paying at the start of each interval earns slightly more, by roughly one period of interest on each deposit.

The rate is an assumption you are making

A savings rate quoted by a bank is a fact for as long as it lasts. A rate of return on investments is a guess, and a single number hides the fact that real returns arrive unevenly, including years that are negative. Two portfolios with the same average return can end up far apart depending on the order the good and bad years arrive in.

Use the calculator to compare scenarios rather than to produce one figure to rely on. The output is labelled an estimate for that reason.

What reduces the result

Tax on interest or gains, account fees, fund charges and inflation all eat into the number shown. Fees are the most easily underestimated: a percentage taken every year is taken from a compounding balance, so its lifetime cost is far larger than the annual figure suggests.

For the interest calculation without compounding, which applies to some fixed-term loans and bonds, see the simple interest calculator.

With your numbers

A = $10,000.00 × (1 + 7% ÷ 12)^(12 × 10)
Total put in = $10,000.00
Ending balance = $20,096.61, of which $10,096.61 is growth

Quick reference

A constant return is an assumption, not a forecast. Nothing here models tax, fees, inflation or a rate that changes, so every figure is an estimate.

Common borrowing and saving examples, worked out with the options this calculator starts on for United States.
Example	Ending balance
USD 10,000 at 7% for 10 years	$20,096.61
USD 10,000 at 7% plus 250 a month	$63,367.82
USD 5,000 at 4.5% for 5 years	$6,258.98
USD 0 starting, 500 a month for 20 years at 6%	$231,020.45
USD 25,000 at 5% compounded annually for 15 years	$51,973.20
USD 2,000 at 8% for 30 years	$21,871.46
EUR 15,000 at 3% for 10 years	€20,240.30
EUR 8,000 at 4% plus 200 a month for 12 years	€49,753.55

Common questions about the Compound Interest Calculator

Does compounding frequency make much difference?: Less than people expect. 10,000 at 7% for ten years grows to 19,672 compounded annually and 20,097 compounded monthly. The rate and the number of years matter far more.
What rate should I use?: Whatever you are actually offered for a savings account or bond. For investments there is no correct answer, because returns vary and can be negative. Try a range rather than treating one figure as a forecast.
Does this account for inflation?: No. Every figure is in today's money at face value. To see a rough real return, enter the rate minus expected inflation instead of the nominal rate.
Are taxes and fees included?: No. Both reduce the result, sometimes substantially over long periods. A 1% annual fee on a 7% return removes far more than a seventh of the growth, because the money removed would itself have compounded.