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Financial

CD Calculator

Certificate of Deposit return calculator. Free online CD Calculator. Calculate cd online — fast, accurate, mobile-friendly, no signup needed.

Maturity value
$5,705.83
Interest earned
$705.83

Derivation

  1. ├── 01GivenP = 5000, r = 4.5, n = 3
  2. ├── 02FormulaMaturity value: t × (1+a / 100)^(n)
  3. ├── 03Substitutet × (1+a / 100)^(3)
  4. ├── 04Compute Maturity value$5,705.83
  5. ├── 05FormulaInterest earned: t × (1+a / 100)^(n)-t
  6. ├── 06Substitutet × (1+a / 100)^(3)-t
  7. └── 07Compute Interest earned$705.83
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§01What is

Understanding the CD Calculator

The CD Calculator computes Maturity value from 3 inputs: deposit ($), apy (%), years. Certificate of Deposit return calculator.

Quick calculators for the math that shouldn’t need a notepad — instant, accurate, private to your browser. The CD Calculator sits in that toolkit — it certificate of Deposit return calculator. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

Maturity value = t × (1+a / 100)^(n) | Interest earned = t × (1+a / 100)^(n)-t

Where

P
Deposit ($)
r
APY (%)
n
Years
Maturity value
Output value
Interest earned
Output value
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Deposit ($) = 5000, APY (%) = 4.5, Years = 3.

  1. 01Start by noting the input — Deposit ($): 5000.
  2. 02Start by noting the input — APY (%): 4.5.
  3. 03Start by noting the input — Years: 3.
  4. 04Substitute these values into the formula: Maturity value = t × (1+a / 100)^(n) | Interest earned = t × (1+a / 100)^(n)-t
  5. 05Compute Maturity value: the calculator returns 5705.83.
  6. 06Compute Interest earned: the calculator returns 705.831.
  7. 07Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common CD Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Deposit ($) halved

P = 2500 (from 5000)

Keep every other input at its default and halve the deposit ($). See how maturity value responds.

  1. 01New Deposit ($): 2500
  2. 02Baseline Maturity value: 5705.83
  3. 03New Maturity value: 2852.92
  4. 04Maturity value decreases by 50% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Deposit ($) doubled

P = 10000 (from 5000)

Keep every other input at its default and double the deposit ($). See how maturity value responds.

  1. 01New Deposit ($): 10000
  2. 02Baseline Maturity value: 5705.83
  3. 03New Maturity value: 11411.7
  4. 04Maturity value increases by 100% → use this sensitivity to plan for real-world variation.
03 · PATTERN

APY (%) halved

r = 2.25 (from 4.5)

Keep every other input at its default and halve the apy (%). See how maturity value responds.

  1. 01New APY (%): 2.25
  2. 02Baseline Maturity value: 5705.83
  3. 03New Maturity value: 5345.15
  4. 04Maturity value decreases by 6.3% → use this sensitivity to plan for real-world variation.
04 · PATTERN

APY (%) doubled

r = 9 (from 4.5)

Keep every other input at its default and double the apy (%). See how maturity value responds.

  1. 01New APY (%): 9
  2. 02Baseline Maturity value: 5705.83
  3. 03New Maturity value: 6475.15
  4. 04Maturity value increases by 13.5% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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