Salary To Contractor Rate Calculator

{primary_keyword}: salary to contractor rate calculator\n{related_keywords}: contractor rate calculator, day rate calculator, freelance rate calculator, salary to hourly rate, contractor hourly rate, conversion calculator, freelance income, contractor costs, overhead, taxes, benefits, value added\n{internal_links}: /salary-calculator, /contractor-taxes-guide, /business-expenses-calculator, /day-rate-vs-salary, /freelance-invoicing-templates, /contractor-benefits-guide\n\n==============================================\n\n📝 **Topic: Salary to Contractor Rate Calculator**\n\n**Task:**\nGenerate a **complete, production-ready HTML calculator** for **salary to contractor rate calculator**, followed by a **deep, long-form SEO article** (approx. 1500–2500 words) that ranks on search engines.\n\n**Output Requirements:**\n- ONLY a single HTML file\n- NO markdown fences\n- NO explanations\n- Write **production-quality HTML code** that works immediately when saved as .html\n\n**Technical Requirements (CRITICAL):**\n- Use **inline onclick** events for all interactions\n- Use `var` ONLY (NO const/let/arrow functions)\n- All CSS inside