ROI Calculator

Calculate screen width and height from diagonal size and aspect ratio. Convert between inches and centimeters for displays, TVs, and monitors with instant dimension calculations.

Calculate DPI (dots per inch), image dimensions, and print sizes. Convert between pixels and physical dimensions for printing and displays.

Convert between international paper sizes (A4, Letter, Legal) with dimensions in mm, cm, and inches. Compare ISO A/B series and North American paper standards.

Convert between MPG (miles per gallon), L/100km (liters per 100 kilometers), and other fuel efficiency units. Compare car fuel economy across different measurement systems.

Split large CSV files into smaller files by number of rows. Process large datasets in manageable chunks instantly.

Generate JSON-LD Product schema markup for SEO. Add product details like name, price, brand, rating, and availability to create structured data for rich search results.

View and search large text files up to 200MB in your browser. Features virtual scrolling, line numbers, search functionality, and file statistics. Perfect for log files, CSV, JSON, and code files.

Generate secure, cryptographically random API keys for authentication and authorization. Create custom API keys with various formats including hex, base64, and prefixed keys.

Calculate GST inclusive and exclusive prices. Add or remove GST with CGST, SGST, and IGST breakdown for Indian businesses.

Calculate Tax Deducted at Source (TDS) for Indian payments with automatic ₹ formatting

Calculate income tax payable and net income after tax with customizable tax rates and deductions

Calculate your monthly loan EMI (Equated Monthly Installment) with detailed breakdowns of principal, interest, and total payment.

Generate professional invoices for free. Create, customize, and download invoices with your business details, line items, taxes, and payment terms. Print or save as PDF instantly.

Generate professional receipts for free. Create, customize, and download receipts with your business details, itemized purchases, taxes, and payment methods. Print or save as PDF instantly.

Build UTM tracking parameters for marketing campaigns. Generate tracked URLs with campaign source, medium, campaign name, term, and content parameters.

Calculate monthly mortgage payment with principal, interest, property taxes, insurance (PITI), and HOA fees. Shows amortization schedule, total interest paid, and payoff date with extra payment scenarios.