A comprehensive web-based compound interest calculator that supports over 50 currencies including major fiat currencies and cryptocurrencies.

• Multi-Currency Support: Calculate in 50+ currencies including USD, EUR, GBP, JPY, CNY, INR, BTC, ETH, and many more
• Calculate compound interest with various parameters
• Support for different compounding frequencies (annually, semi-annually, quarterly, monthly, daily)
• Visual representation of growth over time
• Additional contributions support
• Real-time calculations as you type
• Proper currency formatting with locale-specific decimal places
• Cryptocurrency support (Bitcoin, Ethereum)

• Americas: USD, CAD, BRL, MXN, CLP, COP, PEN, ARS, UYU
• Europe: EUR, GBP, CHF, NOK, SEK, DKK, PLN, CZK, HUF, BGN, RON, HRK, ISK
• Asia-Pacific: JPY, CNY, INR, KRW, SGD, HKD, AUD, NZD, THB, MYR, IDR, PHP, VND
• Middle East & Africa: AED, SAR, EGP, ILS, TRY, ZAR, NGN, GHS, KES, MAD, TND
• South Asia: LKR, PKR, BDT, NPR, MMK, KHR, LAK
• Cryptocurrencies: BTC (Bitcoin), ETH (Ethereum)

├── backend/
│   └── index.ts             # Main HTTP server (Hono)
├── frontend/
│   ├── index.html           # Main HTML template
│   ├── index.tsx            # React frontend entry point
│   └── style.css            # Custom styles
├── shared/
│   └── types.ts             # Shared TypeScript types
└── README.md

The calculator accepts the following inputs:

• Currency selection (50+ supported currencies)
• Principal amount (initial investment)
• Annual interest rate (%)
• Time period (years)
• Compounding frequency
• Additional monthly contributions (optional)

All amounts are displayed in the selected currency with proper formatting.

The compound interest formula used:

A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]

Where:

• A = Final amount
• P = Principal amount
• r = Annual interest rate (decimal)
• n = Number of times interest compounds per year
• t = Time in years
• PMT = Additional monthly payment