← Business 📈

ROI & Break-Even Calculator

Type in an investment and its returns, instantly see ROI percentage and exactly when it breaks even.

🟢 EasyDifficulty

1-2 hoursTime

Python, JavaScript, TypeScriptLanguages

What you're building

You're building a small but genuinely useful financial tool: enter what something costs, what it returns per month, and it calculates your ROI percentage plus the exact break-even point in months -- with a simple bar visualization showing your investment being paid back over time. This is the real formula behind every 'is this worth it' business decision, running entirely client-side.

What you'll unlock 🔓

Financial formulasLive form calculationData visualization basics

You'll need

Basic JavaScript
A code editor
A browser

🗺️ Build roadmap

01 Build the investment/return input form → 02 Calculate total ROI percentage → 03 Calculate break-even time in months → 04 Add a visual payback timeline bar → 05 Add input validation and helpful messaging → 06 Add a comparison mode for two scenarios

🔒

Log in to start building

Your first project is free -- create an account to unlock it.