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This calculator is designed to show graphically the effects of varying interest rates, time periods, taxes and inflation on your investments.

  1. THIS IS A JAVA-BASED CALCULATOR. We consider it to be one of our best calculators, however recent changes to Java security make it harder to run on some browsers. You may simply need to authorize Java to run this calculator. Alternatively, you may need to log into your Java Control Panel and adjust your security settings to allow Java to run. Please see below for instructions if you need help with this process. Unfortunately it won't run at all on Google Chrome.

  2. Enter your investment variables by moving the sliders to the desired values.  Results will be calculated dynamically as you adjust these values.

  3. Please note that the sliders don't work in some browsers due to Java incompatibilities. As an alternative, you can enter the relevant values in the text boxes and hit "Enter" on your keyboard to calculate your result.



This calculator couldn't load because either:

  1. Your browser doesn't support Java; or
  2. Your browser supports Java but Java isn't turned on.

You'll need to turn on Java in your browser or open a different browser to use this calculator.


  1. The Microsoft Edge browser will not run Java, however you can open this calculator in Internet Explorer. Select the More option (...) located at the top of the Edge browser and click on Open with Internet Explorer.
  2. To adjust your Java security settings, please go to Windows Control Panel then click "Java". You can also access Java security settings through Apps->Java->Configure Java. Under the "Security" tab, click "Edit Site List" then click "Add". Enter http://www.calculatorweb.com/ then click "OK", "Continue" then "OK" again. You may need to reload the page for the changes to take effect.
  3. Annual investments are made at the beginning of each year.
  4. Interest is paid and taxed at the end of each year.
  5. Investment balances shown are at the end of each year.
  6. Simple Earnings are earnings paid on your total investment assuming interest is not reinvested.
  7. Compound Earnings are additional earnings assuming interest is reinvested. 
  8. Total Value is the sum of your Total Investment, Simple Earnings and Compound Earnings.
  9. All earnings shown are net of tax.
Rate Center
Today's Average Rates Across the Country*
Savings / MMA
Min BalanceNatl AvgFeatured
< $10k0.10%0.83%
$10k - $24.9k0.14%0.83%
$25k - $49.9k0.14%0.83%


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Last modified: Monday, May 1, 2017.