Compound Interest Calculator

Compound Interest Calculator is a simple, focused tool for exploring how values grow over time.

Use three calculation modes:

💰 One-time Investment
Calculate how an initial amount grows with compound interest over time.

🔁 Regular Contributions
See how recurring additions can affect long-term growth.

📈 Growth
Explore compound growth beyond money. Calculate final value, find how many growth units are needed to reach a target, or solve for the required growth rate.

The Growth section also includes example scenarios that make exponential growth easier to understand, from paper folding and chessboard rice to population, storage, half-life, and other non-financial examples.

✨ Features
• One-time compound interest calculations
• Regular contribution calculations
• Final value, units-to-target, and required-rate solving
• Year, month, and day rate periods
• Clear result breakdowns and growth charts
• Shareable result cards with a mini graph
• Light, dark, and system appearance
• Flexible number-format settings
• English and Vietnamese interface
• Examples for exploring compound growth

🧮 The app uses completed growth intervals and keeps the Growth section unit-agnostic, so you can apply the same mathematics to many different kinds of quantities.

Designed to stay clean, direct, and easy to use.

Recent changes:
🎉 What’s new in Version 3.0

📈 Explore compound growth beyond money with the new Growth mode
🧩 Discover a variety of fun, non-financial growth examples
💰 Improved One-time Investment and Regular Contributions calculators
📊 Clearer results, charts, details, and shareable result cards
🎨 Light, Dark, and System themes
🔢 More flexible number formatting
🛡️ Improved accuracy, stability, and handling of extreme values

Thanks for using Compound Interest Calculator! ❤️