Interest Calculator

Calculate simple and compound interest on your savings or investments.

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Result

Fill in the fields above, then press Calculate.

Enter the principal amount, annual interest rate, time period in years, and select a compounding frequency. Click Calculate to see both simple and compound interest results, along with a comparison table showing how different compounding frequencies affect your returns.

Examples

Savings Account

$10,000 at 5% for 5 years compounded monthly yields $12,833.59 in compound interest vs $12,500.00 with simple interest.

Investment Growth

$50,000 at 7% for 10 years compounded quarterly grows to $100,227.51, earning $50,227.51 in interest.

Frequently Asked Questions

What is the difference between simple and compound interest?
Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus any previously earned interest, causing your money to grow faster over time.
How does compounding frequency affect earnings?
More frequent compounding results in slightly higher returns. Monthly compounding earns more than annual, and continuous compounding earns the theoretical maximum.
What is continuous compounding?
Continuous compounding assumes interest is being added at every possible instant, using the mathematical constant e. It represents the upper limit of compound interest growth.
Related Calculators
Compound Interest Calculator
Simple Interest Calculator
Savings Calculator
Loan Calculator

Quick Tips

Double check your inputs. Ensure units match (e.g., inches vs cm).

Did you know?
Calculators are estimates. Consult professionals for critical decisions.