CompoundIQ: Rule of 72
See How Fast Money Doubles
Free · Designed for iPad. Not verified for macOS.
Discover the simple math behind doubling your money — free, fast, and easy to use.
Rule of 72 Calculator — Find Out When Your Money Doubles
Ever wonder how long it takes for your money to double? The Rule of 72 is one of the most powerful shortcuts in personal finance — and now it's in your pocket.
Whether you're evaluating an investment, comparing savings rates, or just curious about the math behind compounding, this app makes it instant and intuitive.
What You Can Calculate:
Enter an interest rate and instantly see how long it takes your money to double. Drag the interactive slider to explore different rates in real time. Or flip it around — enter a target timeframe and find out exactly what return you need.
Key Features:
Simple calculator — input any rate, get your doubling time instantly
Interactive slider — drag from 1% to 20% and watch results update in real time
Reverse calculator — enter target years, see the required rate
Clean, intuitive interface designed for everyday use
Who It's For:
Anyone curious about how compound interest really works
Young investors evaluating savings accounts, CDs, or investment returns
Students learning about the time value of money
Anyone who wants to make smarter financial decisions
Free to Use
Rule of 72 Calculator is completely free with no subscriptions or paywalls.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Nicholas Costa, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Nicholas Costa
- Size
- 4.4 MB
- Category
- Finance
- Compatibility
Requires iOS 16.6 or later.
- iPhone
Requires iOS 16.6 or later. - iPad
Requires iPadOS 16.6 or later. - Mac
Requires macOS 13.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 CompoundIQ LLC