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Financial Planning

Savings Interest Calculator

Estimate the interest a savings balance earns over a number of months from the account’s quoted APY.

Your inputs

Results

Interest earned

$450.00

Ending balance
$10,450.00
Average interest per month
$37.50

✓Exact calculation — rounded only for display

Inputs are never added to links for financial, salary or health calculators.

What this calculator does

Banks usually quote savings accounts by APY, which already includes the effect of compounding. This tool turns an APY into the interest you would earn over any number of months.

Formula and method

Interest = balance × ((1 + APY)^(months/12) − 1)

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Balance: 10000 (any currency)
  • APY (annual percentage yield): 4.5 %
  • Months: 12

Results

  • Interest earned: 450
  • Ending balance: 10,450
  • Average interest per month: 37.5

How to read the results

Over exactly 12 months the interest equals balance × APY.

Assumptions and limitations

  • Assumes the APY stays constant and no deposits or withdrawals occur.
  • Interest may be taxable.

Financial results are estimates based on the inputs and assumptions shown. They are not financial advice; confirm figures with your lender, provider or a qualified adviser before making decisions.

Questions

APY or APR for savings?

APY. It reflects compounding, so it is the right figure to compare savings accounts.

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy