MARZ.tools

Interest Calculator

Compare simple and compound interest growth over time.

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About this tool

Calculate how much a deposit or investment will grow using simple interest or compound interest, with adjustable compounding frequency.

How to use

  1. Enter the principal amount, interest rate, and time period.
  2. Choose simple or compound interest, and compounding frequency if compound.
  3. View the final amount and total interest earned.

FAQ

What's the difference between simple and compound interest?

Simple interest is calculated only on the principal (I = P × r × t). Compound interest is calculated on the principal plus previously earned interest, so it grows faster over time.

What compounding frequencies are supported?

Annually, semi-annually, quarterly, monthly, and daily.

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