About This Calculator
Compound Interest Calculator is a free, no-frills tool for anyone who wants to model how money grows over time. Whether you're planning retirement savings, comparing CD rates, or just curious how compounding works, this calculator gives you instant, accurate results with a full year-by-year breakdown.
What We Do
We built this tool to be fast, accurate, and honest — no sign-ups, no paywalls, no gimmicks. Enter your numbers, get your results. That's it.
- Calculate compound interest using the standard formula: A = P(1 + r/n)nt
- Support for daily, monthly, quarterly, semi-annual, and annual compounding
- Model ongoing contributions with the monthly contribution field
- Full year-by-year breakdown (up to 50 years)
Who It's For
This tool is useful for anyone thinking about money over time:
- Savers comparing high-yield savings accounts or CDs
- Investors modeling long-term portfolio growth
- Students learning about compound interest for the first time
- Anyone with a loan or debt who wants to understand the true cost
Accuracy & Limitations
This calculator uses the standard compound interest formula and is accurate for fixed-rate, fixed-term scenarios. It does not account for taxes, inflation, variable rates, or fees. For legal or investment advice, consult a licensed financial professional.
Contact Us
Have a question or feedback? Visit our Contact page.