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CD Interest Calculator

Estimate certificate of deposit growth and interest using an annual percentage yield (APY) and term length.

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Calculator guide

How to use the CD Interest Calculator

Estimate certificate of deposit growth and interest using an annual percentage yield (APY) and term length. Enter the requested values and select Calculate. The result and supporting values are produced locally in your browser.

Formula

Ending Balance = Principal × (1 + APY)^(Term Months ÷ 12)

Worked example

A $10,000 CD at 4.5% APY for 12 months earns about $450 before taxes or penalties.

What to keep in mind

  • This uses APY, which already reflects the stated compounding convention for a full year.
  • Early withdrawal penalties, taxes, and rate changes are not included.

Methodology

This calculator uses deterministic arithmetic and performs the calculation locally in your browser. Verify assumptions, units, and source values for your specific use case.

Review standard: Level A · Standard formula. How calculator reviews work.

Frequently asked questions

What does this calculator calculate?

Estimate certificate of deposit growth and interest using an annual percentage yield (APY) and term length.

How is the result calculated?

Ending Balance = Principal × (1 + APY)^(Term Months ÷ 12).

Can I use the result for an important decision?

Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.

Does CalculateMeasure store the values I enter?

The calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.