How to calculate CD rates?

You calculate a CD rate by applying A = P(1 + r/n)^(nt): P is your deposit, r is the annual rate as a decimal, n is how many times per year the bank compounds, and t is the term in years. A CD does not pay a flat percentage once — interest is credited at the interval in your disclosure, and each credited amount earns interest of its own for the rest of the term. Convert the rate to a decimal, divide by n, add 1, raise that to the power of n times t, and multiply by your deposit to reach the maturity value. On $10,000 at 4.50% APY compounded daily for 12 months, the formula returns $10,450.00, which is $450.00 in interest. If the quoted rate is already APY rather than nominal, set n to 1, because APY has already absorbed compounding and applying it again overstates the result.

How to calculate a CD rate from the interest you were paid?

You find the rate a CD actually paid by dividing the interest you received by your original deposit, then annualising that ratio if the term was not exactly one year. On a 12-month CD this is a single step: $1,087.50 of interest on a $25,000 deposit is 1,087.50 divided by 25,000, or 4.35%, which is already the annual rate because the term matches a year exactly. The reason a separate annualising step exists for other terms is that a 6-month CD earning 2% has actually paid roughly 4% on an annual basis, so comparing raw interest across different term lengths without adjusting for time misstates the rate. To annualise, add 1 to the total growth ratio (maturity value divided by deposit), raise it to the power of 12 divided by the term in months, then subtract 1. A $10,000 CD that grows to $10,222.52 over 6 months annualises to 4.50%, the same rate as one earning $450.00 over a full 12 months.

How to calculate CD rate differences between banks?

You compare CD rates between banks by running each offer through the compound interest formula A = P(1 + r/n)^(nt) using the same deposit and the same term, then subtracting the two maturity values to get the dollar gap. This matters because a percentage-point difference sounds small in isolation but is only meaningful once it is converted into what you actually receive on your own balance — a rate that looks close on paper can be a real gap in dollars once your deposit size is applied. On $25,000 for 12 months, a 4.35% APY offer matures at $26,087.50 against a 4.00% APY offer's $26,000.00, a $87.50 difference that repeats every time the CD renews. The one rule that must hold for the comparison to be valid is that both figures are on the same basis — always compare APY to APY, never APY to a nominal APR, because a bank quoting APR on a daily-compounding CD will look artificially cheaper than one quoting the equivalent APY.

Do CD rates change during the term?

No, a standard CD's rate is fixed for the entire term once you fund it, which is the main reason to choose one over a variable-rate savings account when rates are expected to fall. The rate is locked because the bank is contractually committing to pay that yield in exchange for you committing not to withdraw the money, and both sides of that trade are fixed at the same time. On a $10,000 deposit at 4.50% APY for 12 months, the maturity value of $10,450.00 is guaranteed the day you open the account regardless of what happens to rates in the broader market afterward. The exception is a small category of products built specifically to move: bump-up CDs let you request one rate increase during the term if the bank's rates rise, step-up CDs increase on a pre-set schedule, and variable-rate CDs track an index throughout — each of these has its own contract terms and is a distinct product from a standard fixed-rate CD.

CD Rate Calculator

اعرف القيمة الحقيقية لسعر CD في أي بنك.

Compare CD rates across banks and see what each rate is actually worth in dollars at maturity.

عند الاستحقاق: ‏٢٦٬٠٨٧٫٥٠ US$
الفائدة: ‏١٬٠٨٧٫٥٠ US$

شهادة الإيداع الخاصة بك

مبلغ الإيداع

معدل الفائدة

المعدل معروض كـ

المدة

1 سنة

المدد الشائعة

دورية احتساب الفائدة المركبة

القيمة عند الاستحقاق: ‏٢٦٬٠٨٧٫٥٠ US$
إجمالي الفائدة المكتسبة: ‏١٬٠٨٧٫٥٠ US$
العائد السنوي الفعلي APY: ٤٫٣٥%

‏٢٥٬٠٠٠٫٠٠ US$ في شهادة إيداع لمدة 1 سنة بمعدل ٤٫٣٥% APY، بفائدة مركبة يومي، تنمو إلى ‏٢٦٬٠٨٧٫٥٠ US$ — أي ‏١٬٠٨٧٫٥٠ US$ من الفائدة، بمتوسط ‏٩٠٫٦٣ US$ شهريًا.

الرصيد خلال المدة

أصل المبلغالفائدة

عرض الأرقام في جدول

الرصيد خلال المدة
الشهر	أصل المبلغ	الفائدة	الرصيد
عند الفتح	‏٢٥٬٠٠٠٫٠٠ US$	‏٠٫٠٠ US$	‏٢٥٬٠٠٠٫٠٠ US$
2mo	‏٢٥٬٠٠٠٫٠٠ US$	‏١٧٨٫٠٥ US$	‏٢٥٬١٧٨٫٠٥ US$
5mo	‏٢٥٬٠٠٠٫٠٠ US$	‏٤٤٧٫٥٠ US$	‏٢٥٬٤٤٧٫٥٠ US$
7mo	‏٢٥٬٠٠٠٫٠٠ US$	‏٦٢٨٫٧٤ US$	‏٢٥٬٦٢٨٫٧٤ US$
10mo	‏٢٥٬٠٠٠٫٠٠ US$	‏٩٠٣٫٠٢ US$	‏٢٥٬٩٠٣٫٠٢ US$
1y	‏٢٥٬٠٠٠٫٠٠ US$	‏١٬٠٨٧٫٥٠ US$	‏٢٦٬٠٨٧٫٥٠ US$

Calculated in your browser using A = P(1 + r/n)^nt. Nothing is sent to a server. Figures are before tax; confirm exact terms with your bank.

مجاني — بدون تسجيل
يتحدّث أثناء الكتابة
يعمل في متصفحك

آخر مراجعة للمعادلات والمحتوى ٢١ يوليو ٢٠٢٦. أسعار البنوك تتغيّر باستمرار — تأكّد من الأسعار الحالية مباشرةً مع مؤسستك المالية.

الإجابة المختصرة

كيف تحسب سعر الفائدة على شهادة CD؟

A CD rate calculator turns a bank's advertised rate into the dollar figure you will actually hold at maturity, which is the only number worth comparing between offers. Enter the deposit, the quoted rate and the term, and the tool applies A = P(1 + r/n)^(nt). A $10,000 deposit at 4.50% APY for 12 months matures at $10,450.00. The reason a calculator beats reading the rate is that headline rates are not directly comparable: one bank may quote 4.50% APY while another quotes a 4.40% nominal rate compounded daily, and those are the same CD. Rates are also frequently tied to a minimum balance or a promotional term that reverts on renewal. Convert every offer to a maturity value on your own deposit and your own term, and the ranking often changes.

المعادلة والطريقة

كيف تُحتسب

A = P(1 + r/n)^(nt)

The standard compound interest formula banks use to credit CD interest.

A: Maturity value — what you withdraw at the end
P: Principal — your opening deposit
r: Nominal annual rate as a decimal (4.35% → 0.0435)
n: Compounding periods per year (daily = 365)
t: Term in years (12 months → 1)

خطوة بخطوة

1
Convert the advertised rate to a decimal: divide the percentage by 100.
2
Divide that decimal by the number of compounding periods per year (n).
3
Add 1, then raise the result to the power of n × t.
4
Multiply by your principal. That product is your maturity value.
5
Subtract the principal to isolate the interest the rate earned you.

دليل الاستخدام

كيفية استخدام هذه الحاسبة

أربعة مدخلات ونتائج فورية. لا شيء ترسله ولا تسجيل مطلوب.

1
Enter your deposit
Type the amount you plan to place in the CD, or drag the slider. Check it clears the bank's minimum opening deposit.
2
Enter the advertised rate
Use the rate from the bank's rate sheet. Toggle APY or APR to match exactly how the bank quotes it — this matters.
3
Set the term
Pick the term the rate applies to. Promotional rates are usually tied to one specific term such as 7 or 13 months.
4
Compare the maturity value
Change the rate to a competing bank's offer and watch the maturity value update live. The gap is the real cost of choosing the lower rate.

أمثلة

أمثلة محلولة

أرقام حقيقية محلولة حتى النهاية، لتتحقق بنفسك من صحة الحاسبة مقابل أرقامك أنت.

Comparing two 12-month offers on a $25,000 deposit

Deposit: $25,000
Bank A rate: 4.35% APY
Bank B rate: 4.00% APY
Term: 12 months

Bank A at maturity: $26,087.50
Bank B at maturity: $26,000.00
Difference: $87.50

A 0.35 percentage-point gap is worth $87.50 over one year on $25,000 — small in isolation, but it compounds every time you renew.

المنهجية

الدقة والافتراضات

كل حاسبة تقوم على افتراضات. وهذه افتراضاتنا موضّحة بصراحة، لتعرف تماماً ما تشمله الأرقام وما لا تشمله.

The rate you enter stays fixed for the entire term, which is true of standard fixed-rate CDs.
Interest stays in the CD and compounds rather than being paid out to a linked account.
No additional deposits are made — most CDs do not permit them after opening.
Results are before tax. CD interest is taxable as ordinary income in the year it is credited.

تتبع الأعراف المعتمدة هنا قاعدة Regulation DD (12 CFR 1030)، وهي التي تحكم كيفية إفصاح المؤسسات الأمريكية عن APY على حسابات الودائع. والودائع لدى المؤسسات المؤمَّنة محمية من FDIC حتى $250,000 لكل مودع، ولكل بنك، ولكل فئة ملكية.

المصادر الأولية

من أين تأتي هذه القواعد

الأعراف التي تتبعها هذه الحاسبة تضعها الجهات التنظيمية لا نحن. وكل واحدة منها ترتبط بالجهة المُصدِرة لها لتتحقق منها بنفسك بدل أن تأخذ بكلامنا.

التفاصيل

تفاصيل وقواعد أساسية

حقائق سريعة يجدر بك معرفتها قبل فتح شهادة CD أو تجديدها.

APY already includes the effect of compounding; APR does not. Comparing an APY at one bank to an APR at another overstates the second bank's offer.
Rate sheets change weekly. Confirm the rate is still live and locked before you fund the account.
Promotional 'odd-term' CDs (7, 11, 13 months) often carry the best rates because banks use them to attract new deposits.
A rate is only guaranteed for the initial term — most CDs auto-renew at the bank's then-current standard rate, which is usually lower.

كيف ترتبط ببعضها

مفاهيم وحاسبات ذات صلة

تعمل CD Rate Calculator جنباً إلى جنب مع هذه الأدوات ذات الصلة، ويغطي كل منها جزءاً واحداً من صورة شهادات CD تغطيةً كاملة.

التطبيقات

لمن هذه الحاسبة

Rate shoppers
You have offers open in three browser tabs and need the dollar difference, not the percentage difference.
Renewing savers
Your CD is maturing and you want to know whether your bank's renewal rate is worth accepting.
Cash-heavy planners
You are parking a large balance and even a fractional rate gap moves real money.

أدوات ذات صلة

كل حاسبات CD

تسع أدوات مركّزة تغطي صورة شهادات الإيداع كاملةً.

الأسئلة الشائعة

أسئلة شائعة حول CD Rate Calculator

إجابات مباشرة عن الأسئلة الأكثر تكراراً حول هذه العملية الحسابية. والمزيد في مركز الأسئلة الشائعة.

You calculate a CD rate by applying A = P(1 + r/n)^(nt): P is your deposit, r is the annual rate as a decimal, n is how many times per year the bank compounds, and t is the term in years. A CD does not pay a flat percentage once — interest is credited at the interval in your disclosure, and each credited amount earns interest of its own for the rest of the term. Convert the rate to a decimal, divide by n, add 1, raise that to the power of n times t, and multiply by your deposit to reach the maturity value. On $10,000 at 4.50% APY compounded daily for 12 months, the formula returns $10,450.00, which is $450.00 in interest. If the quoted rate is already APY rather than nominal, set n to 1, because APY has already absorbed compounding and applying it again overstates the result.
You find the rate a CD actually paid by dividing the interest you received by your original deposit, then annualising that ratio if the term was not exactly one year. On a 12-month CD this is a single step: $1,087.50 of interest on a $25,000 deposit is 1,087.50 divided by 25,000, or 4.35%, which is already the annual rate because the term matches a year exactly. The reason a separate annualising step exists for other terms is that a 6-month CD earning 2% has actually paid roughly 4% on an annual basis, so comparing raw interest across different term lengths without adjusting for time misstates the rate. To annualise, add 1 to the total growth ratio (maturity value divided by deposit), raise it to the power of 12 divided by the term in months, then subtract 1. A $10,000 CD that grows to $10,222.52 over 6 months annualises to 4.50%, the same rate as one earning $450.00 over a full 12 months.
You compare CD rates between banks by running each offer through the compound interest formula A = P(1 + r/n)^(nt) using the same deposit and the same term, then subtracting the two maturity values to get the dollar gap. This matters because a percentage-point difference sounds small in isolation but is only meaningful once it is converted into what you actually receive on your own balance — a rate that looks close on paper can be a real gap in dollars once your deposit size is applied. On $25,000 for 12 months, a 4.35% APY offer matures at $26,087.50 against a 4.00% APY offer's $26,000.00, a $87.50 difference that repeats every time the CD renews. The one rule that must hold for the comparison to be valid is that both figures are on the same basis — always compare APY to APY, never APY to a nominal APR, because a bank quoting APR on a daily-compounding CD will look artificially cheaper than one quoting the equivalent APY.
No, a standard CD's rate is fixed for the entire term once you fund it, which is the main reason to choose one over a variable-rate savings account when rates are expected to fall. The rate is locked because the bank is contractually committing to pay that yield in exchange for you committing not to withdraw the money, and both sides of that trade are fixed at the same time. On a $10,000 deposit at 4.50% APY for 12 months, the maturity value of $10,450.00 is guaranteed the day you open the account regardless of what happens to rates in the broader market afterward. The exception is a small category of products built specifically to move: bump-up CDs let you request one rate increase during the term if the bank's rates rise, step-up CDs increase on a pre-set schedule, and variable-rate CDs track an index throughout — each of these has its own contract terms and is a distinct product from a standard fixed-rate CD.

الأمان والخصوصية

أرقامك لا تغادر متصفحك

كل عملية حسابية في هذا الموقع تجري بلغة JavaScript على جهازك أنت. لا حساب، ولا استدعاء للخادم، ولا تحليلات مرتبطة بالأرقام التي تدخلها.

معادلات بمعايير البنوك
تستخدم أعراف الفائدة المركبة وAPY نفسها التي تتبعها البنوك بموجب Regulation DD.
مجانية 100% وبلا تسجيل دخول
لا تسجيل، ولا جدار بريد إلكتروني، ولا اشتراك مدفوع. وكل حاسبة صالحة للاستخدام بالكامل من أول زيارة.
بياناتك لا تغادر متصفحك
كل عملية حسابية تجري على جهاز العميل بلغة JavaScript. ولا يُرسَل شيء إلى خادم ولا يُخزَّن.

يُقدَّم الموقع عبر HTTPS دون محتوى مختلط. اقرأ سياسة الخصوصية أو اطّلع على المعادلات والمنهجية التي يقوم عليها كل رقم.

Know what a rate is really worth

A quarter point sounds like nothing until you see it in dollars. Run your numbers through both offers before you commit your deposit.

Compare CD Rates Now العودة إلى CD Calculator

CD Rate Calculator

كيف تحسب سعر الفائدة على شهادة CD؟

كيف تُحتسب

خطوة بخطوة

كيفية استخدام هذه الحاسبة

Enter your deposit

Enter the advertised rate

Set the term

Compare the maturity value