Interest Calculator — Calculate Simple & Compound Interest

Interest Calculator

Calculate simple and compound interest for savings, loans, and investments. Determine how much interest you’ll earn or pay over time with different compounding frequencies.

Step 1: Investment Details

5%
10 years

Understanding Interest Types

Compound interest calculates interest on both principal and accumulated interest, while simple interest only calculates on the original principal. Compound interest yields higher returns over time.

Step 2: Additional Settings

Leave as 0 for no regular contributions

About Compounding

More frequent compounding periods result in higher returns. Continuous compounding represents the theoretical limit of compounding frequency and yields the maximum possible return.

Interest Calculation Results

Summary
Compounding Comparison
Yearly Breakdown

Total Future Value

$16,288.95
After 10 years at 5% compounded quarterly
Total Interest Earned
$6,288.95
Principal Amount
$10,000
Interest Type
Compound
Annual Rate
5%

Compounding Frequency Comparison

Compounding Frequency Future Value Interest Earned Effective Annual Rate

Year-by-Year Growth

Interest Calculation Formula

Compound Interest: A = P(1 + r/n)nt

A = Future Value, P = Principal, r = Annual Interest Rate, n = Compounding periods per year, t = Time in years

Simple Interest: A = P(1 + rt)

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