Interest Calculator (Simple & Compound)

Finance & MoneyFinance

Calculate accrued interest, future wealth value, and compound growth over time.

Finance & Money
100% Client-Side: Runs in browser
Zero Uploads•Free Forever ($0)•No Registration

Simple & Compound Interest Calculator

Calculate accrued interest, future wealth value, and compound growth over time.

Principal Invested
100,000
Total Interest Earned
33,100
Total Future Value
133,100

How to Use Interest Calculator (Simple & Compound)

Follow these simple steps to use this free browser-based tool:

1

Choose Mode

Select either Compound Interest or Simple Interest.

2

Enter Parameters

Type your principal deposit, annual interest rate, and duration in years.

3

Review Growth

See your total earned interest and total maturity amount.

Key Features & Benefits

Dual mode: Simple Interest ($I = PRT$) and Compound Interest ($A = P(1 + r/n)^{nt}$)
Customizable compounding frequency: Annually, Semi-Annually, Quarterly, Monthly
Clear breakdown of Principal vs Total Interest Earned
100% private: all calculations performed locally in your browser

Frequently Asked Questions

Why does compound interest grow faster than simple interest?

Simple interest is paid only on the initial principal, whereas compound interest adds earned interest back into the principal each period, earning 'interest on interest'.

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