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Simple vs. Compound Interest

See how compounding changes an initial deposit over time.

Enter your assumptions

Change a number. Your estimate updates automatically.

Currency changes formatting only; no exchange conversion.

This comparison assumes no additional deposits. The same nominal rate is used for both methods.

Your estimated future balance
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Your money over time

Constant-rate illustration. Taxes and fees are excluded. Returns can vary or be negative; this is not a guaranteed outcome.

View yearly breakdown
Year-end projections (rounded for display)

How this tool works

Simple interest is P × (1 + rt). Compound interest is P × (1 + r/n)^(nt). This comparison uses a single starting deposit, without ongoing contributions.

Try an example

For example, compare a 10,000 deposit at 7% over 20 years. Simple interest grows by the same amount each year; compound growth depends on the changing balance. Simple-interest scenarios that imply a balance below zero are rejected.

Questions & assumptions

What does the result include?

This is a mathematical projection using the inputs shown. It excludes taxes, fees, and changes in rates.

Can I export the result?

Yes. Download the projection as CSV or print the result. Changing an input recalculates the output.

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