CD Calculator

Use this CD calculator to find the maturity value and interest of a certificate of deposit, and compare rates, terms and compounding frequencies.

What it does

The CD Calculator shows how much a certificate of deposit grows over a fixed term. You enter the deposit, the annual rate, the length in months, and how often interest compounds, and it returns the balance at maturity and the interest earned.

Data sources & parameters

This calculator uses standard financial formulas and runs entirely in your browser. It needs no external rate data — your result is computed only from the values you enter above.

We always strive to use the latest data for every variable so our results and reports are as accurate as possible. Even so, errors are possible — you should not rely on this tool or its report alone, and we accept no liability for any decision made based on it.

The formula

Maturity = P × (1 + r/m)^(m × t), where P is the deposit, r the annual rate, m the compounding periods per year, and t the term in years

How it works

The annual rate is split across the compounding periods, and interest is added to the balance each period so that future interest is earned on a larger amount. A longer term and more frequent compounding both raise the final figure.

Where it is used

Comparing CD offers with different rates and terms
Deciding between monthly, quarterly, or annual compounding
Estimating guaranteed interest before locking money away

Worked example

A saver deposits $10,000.00 in a 24-month CD paying 4.5% compounded monthly. At maturity the balance is …, of which … is interest earned over the term.

What the CD calculator does

Enter your deposit, the annual interest rate, the term in months and how often interest compounds, and the CD calculator shows the value of a certificate of deposit at maturity and the total interest earned. The donut chart splits the final balance into your deposit and the interest. Because a CD pays a fixed rate for a fixed period, the result is a firm projection.

How a certificate of deposit works

You give a bank a lump sum, agree not to touch it for a set term, and the bank pays a guaranteed rate, usually higher than an instant-access savings account. Terms range from a few months to five years or more. At maturity you get your deposit back plus the interest. The money is locked away, and withdrawing early normally triggers a penalty, so a CD suits savings you will not need for a while, such as a fund for a future purchase or part of an emergency reserve.

How the calculation works

The annual rate is divided by the number of compounding periods in a year: twelve slices for monthly compounding, 365 for daily. Each period, that slice of interest is added to the balance, and the next period's interest is calculated on the larger balance.

Maturity value = P × (1 + r/m)^(m × t)

P is your deposit, r the annual rate as a decimal, m the number of compounding periods per year, and t the term in years. Interest earned is the maturity value minus the deposit.

Compounding frequency

More frequent compounding means interest starts earning interest sooner, so the final balance is a little higher. At ordinary rates the effect is modest: moving from annual to daily compounding on a mid-sized deposit might add a fraction of a percent. It grows at higher rates and over longer terms. When comparing offers, check how often each compounds as well as its rate, because a slightly lower rate compounded daily can occasionally beat a higher one compounded annually.

Comparing CD offers

Enter the same deposit for each offer to compare the maturity values side by side. You can also compare terms: a longer term usually pays a higher rate but locks your money up for longer, and running a two-year and a five-year scenario shows how much extra interest the longer commitment earns.

Things to keep in mind

The interest shown is before tax; in most places CD interest is taxable in the year it is credited. The projection assumes you hold the CD to maturity, and cashing out early usually costs several months of interest. A CD fixes today's rate for the whole term, which protects you if rates fall but means you miss out if they rise, so consider the rate outlook before committing to a long term.

For money you will not need for a defined period, a CD offers a predictable, low-risk return that you can compare in advance with a savings account, a bond or keeping cash accessible.

This article is general information only and is not financial advice.

About This CD Calculator

Use this CD calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.

Frequently asked questions

How does the CD calculator work?

You enter your deposit, the annual interest rate, the term in months, and how often interest compounds. The calculator splits the annual rate across each compounding period, adds interest to the balance each period, and returns the value at maturity along with the total interest earned.

What is a certificate of deposit?

A certificate of deposit, or CD, is a savings product where you lock a fixed amount away for a set term in exchange for a fixed interest rate. In return for not touching the money until maturity, you usually earn a higher rate than an ordinary savings account.

Does compounding frequency change how much I earn?

Yes, but only slightly at typical rates. More frequent compounding, such as daily instead of annually, adds a little more interest because earlier interest starts earning sooner. The difference grows with higher rates and longer terms but is usually small.

Is the interest on a CD taxed?

In most countries CD interest is treated as taxable income in the year it is credited or paid, even if you leave it in the account. This calculator shows the gross interest before any tax, so check your local rules for the net figure.

What happens if I withdraw early?

Most CDs charge an early withdrawal penalty, often several months of interest, if you take the money out before maturity. This calculator assumes you hold the CD to the end of its term, so early withdrawal would reduce the interest shown.

About the author

Written and reviewed by

Taha Kheirandish

Economics student and independent researcher

Taha Kheirandish reads tax codes the way other people read maps — to find out where a system actually leads, not where it claims to go.

He is an economics student, and his work here is comparative by design. A pension deferral bonus in Quebec, a commuting allowance in Germany, a rent-increase ceiling in the Netherlands: each is a decision a government made about how money should move, and each reads differently once you set it beside eight others. He builds and checks these calculators across nine markets from primary sources — the regulation rather than a summary of it, the ministry’s own circular rather than a news item quoting it.

That is the editorial standard of the site as well as his habit. Every rate, threshold and bracket here carries the document it was read from and the date it takes effect, and gets re-checked when the law moves rather than when someone happens to notice.

He is a researcher, not a licensed adviser, and nothing on this site is personal financial advice. It is arithmetic done carefully with its sources shown — so that you can check it, and take it to someone who is.

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