A comprehensive, professional-grade financial calculator website designed specifically for Indian users. Built with modern web technologies and featuring Swiss Design aesthetics for maximum trust and usability.
- Accurate loan calculations using Indian banking standards
- Reducing balance method - the most accurate EMI calculation
- Interactive pie charts showing principal vs interest breakdown
- Amortization schedules with month-wise payment details
- Real-time calculations as you type
- Support for home loans, personal loans, car loans, and more
- Systematic Investment Plan calculations for mutual fund investments
- Compound interest calculations with monthly contributions
- Step-up SIP options with annual increase percentages
- Interactive line charts showing investment growth over time
- Stacked area visualizations for corpus vs contributions breakdown
- Goal planning with target corpus calculations
- Latest tax rules for financial year 2025-26
- Dual regime comparison - Old vs New tax regime
- Age-based calculations (General, Senior, Super Senior)
- Detailed tax breakdown with slab-wise calculations
- Deduction optimization suggestions (80C, 80D, etc.)
- Enhanced rebate calculations up to ₹12 lakh income
- Tax-saving strategies and investment recommendations
- Fixed Deposit returns calculator with multiple options
- Simple vs Compound interest comparison
- Multiple compounding frequencies (monthly, quarterly, half-yearly, yearly)
- TDS calculation information with current thresholds
- Tax-saving FDs under Section 80C (5-year lock-in)
- Comparison charts for different tenures and interest rates
- Grid-based layouts for mathematical precision
- Typography-first approach for maximum readability
- Minimal decoration focusing on content clarity
- Professional color scheme building trust and credibility
- Clean, modern interface optimized for financial data
- 95% Achromatic (black, white, gray) for neutrality
- 5% Accent Blue (#003366) for trust and professionalism
- WCAG AAA compliant contrast ratios for accessibility
- Helvetica Neue family for clean, professional appearance
- 8-type scale hierarchy (64px display → 12px caption)
- Flush-left alignment for enhanced readability
- Generous line spacing for comfortable reading
- Frontend: React 18 + TypeScript
- Styling: TailwindCSS with custom Swiss Design tokens
- Charts: Chart.js for interactive data visualizations
- Build Tool: Vite for optimized development and production builds
- Routing: React Router for seamless navigation
- Package Manager: npm/pnpm
- Node.js 18+
- npm or pnpm
# Clone the repository
git clone https://github.com/Ammar-32-dev/indian-financial-calculators.git
# Navigate to project directory
cd indian-financial-calculators
# Install dependencies
npm install
# or
pnpm install
# Start development server
npm run dev
# or
pnpm dev# Create production build
npm run build
# or
pnpm build
# Preview production build
npm run preview
# or
pnpm previewThe website is fully responsive and optimized for:
- Desktop (1200px+)
- Tablet (768px - 1199px)
- Mobile (320px - 767px)
All calculators work seamlessly across devices with touch-friendly interfaces.
The website includes strategic Google AdSense placement areas optimized for:
- Maximum revenue without compromising user experience
- Mobile-responsive ad units (300×250, 320×100, 728×90)
- Non-intrusive placement between calculator sections
- Policy compliance with Google's financial content guidelines
All calculations are based on:
- Indian banking standards and RBI guidelines
- Current 2025-26 tax rules and regulations
- Industry-standard formulas used by major Indian banks
- Verified mathematical models for accuracy and reliability
- Indian professionals making financial decisions
- First-time investors planning SIP investments
- Home loan borrowers calculating EMIs
- Tax payers optimizing their 2025-26 tax liability
- Fixed deposit investors comparing returns
- Instant calculations with real-time results
- Optimized bundle size for fast loading
- Efficient chart rendering with Chart.js
- Progressive enhancement for better user experience
- SEO optimized structure and metadata
- No data collection - all calculations happen client-side
- No user tracking or personal information storage
- Secure calculations with transparent methodologies
- Professional disclaimers and calculation limitations
- Educational content explaining all formulas
Each calculator includes:
- Formula explanations and mathematical derivations
- Step-by-step methodologies for understanding
- Real-world examples and use cases
- Tax implications and planning guidance
- Investment strategies and recommendations
src/
├── components/ # Reusable UI components
│ ├── Calculator/ # Calculator-specific components
│ ├── Charts/ # Chart visualization components
│ ├── Layout/ # Layout and navigation
│ └── UI/ # Common UI elements
├── pages/ # Page components
│ ├── Home.tsx # Landing page
│ ├── EMI.tsx # EMI Calculator
│ ├── SIP.tsx # SIP Calculator
│ ├── Tax.tsx # Income Tax Calculator
│ └── FD.tsx # FD Calculator
├── utils/ # Utility functions
│ ├── calculations/ # Mathematical formulas
│ ├── formatters/ # Data formatting utilities
│ └── validators/ # Input validation
├── styles/ # Global styles and tokens
└── types/ # TypeScript type definitions
- Calculation Engine - Accurate mathematical formulas
- Chart Renderer - Interactive data visualizations
- Responsive Layout - Multi-device optimization
- Form Handler - Real-time input processing
- Theme System - Swiss Design implementation
- EMI: EMI = P × R × (1+R)^N / [(1+R)^N – 1]
- SIP: FV = PMT × [((1 + r)^n - 1) / r] × (1 + r)
- Tax: Based on latest 2025-26 Indian tax slabs
- FD: Compound interest with quarterly compounding
- Chart.js - Data visualization
- React Router - Navigation
- TailwindCSS - Styling
- Lucide React - Icons
We welcome contributions! Please read our contributing guidelines:
- Fork the repository
- Create a feature branch
- Make your changes
- Add tests if applicable
- Submit a pull request
- Follow Swiss Design principles
- Maintain calculation accuracy
- Ensure responsive design
- Write clean, documented code
- Test across devices and browsers
This project is open source and available under the MIT License.
- Indian Banking Industry for calculation standards
- SEBI for investment guidelines
- Government of India for tax policy updates
- Swiss Design Movement for aesthetic principles
- Open Source Community for tools and libraries
For questions, issues, or suggestions:
- GitHub Issues - Bug reports and feature requests
- Email Support - For calculation accuracy concerns
- Documentation - Comprehensive guides in
/docs
- Initial release with all four calculators
- Swiss Design implementation
- AdSense integration ready
- Mobile responsive design
- 2025-26 tax calculations
- Compound vs Simple Interest comparisons
- More Investment Options (PPF, ELSS, NPS)
- Advanced Tax Planning tools
- Multi-language Support (Hindi, regional languages)
- PDF Export for calculations
- Offline Support (PWA features)
- Use current interest rates from your bank/institution
- Include all applicable deductions in tax calculations
- Consider inflation for long-term SIP planning
- Compare multiple scenarios using the charts
- Start with Home page for overview
- Use mobile portrait mode for easier input
- Refer to formula explanations for understanding
- Save/Bookmark results for future reference
Built with ❤️ for the Indian financial community
Making complex financial calculations simple, accurate, and accessible to everyone.