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Interest Calculator

Calculate simple or compound interest and see how your money grows over time.

Interest details

Simple vs Compound Interest

Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus previously earned interest, which is why money can grow much faster over long periods.

Why Compounding Frequency Matters

The more often interest is compounded, the higher the final balance can be for the same nominal rate. That is why monthly, quarterly, and annual compounding can produce slightly different outcomes even with the same starting amount.

Common Questions

What is the difference between simple and compound interest?+

Simple interest is calculated only on principal, while compound interest is calculated on principal plus previously earned interest.

Why does compounding frequency matter?+

More frequent compounding generally increases final amount because interest is added to the balance more often.

Can I use this for investments and loans?+

Yes. The same math applies, but investment returns and loan terms may include extra fees or taxes not captured here.

What inputs have the biggest impact on growth?+

Rate and time usually matter most. Longer duration dramatically magnifies compounding outcomes.