Interest calculator

Calculate simple and compound interest on your investment with side-by-side comparison. Free in your browser with no signup.

Basic details

Advanced options

Deducted from earned interest only, not from principal or deposits.

Used to estimate the final amount’s real purchasing power.

Final amount after tax
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Total interest before tax
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Principal
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Total principal and deposits
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Estimated tax
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Effective annual yield
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Real value after inflation
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Comparison: simple vs compound

Simple interest
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Compound interest
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Annual investment growth schedule

Year Total contributions Accumulated interest Balance before tax

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