# CalculatorFlux > Free, accurate online calculators for finance, health, payroll, construction, education, math, food, and more. 163 tools, no sign-up required, updated for 2025-26. ## Site - URL: https://calculatorflux.com - Contact: support@calculatorflux.com - Sitemap: https://calculatorflux.com/sitemap.xml ## About CalculatorFlux provides free browser-based calculators. All calculations run client-side — no data is sent to servers. Payroll calculators use the current IRS Publication 15-T and each state's published tax rates. Health calculators use formulas from the ADA, WHO, CDC, and AHA. Financial calculators use standard industry formulas. --- ## Categories ### Payroll & Tax 50+ state and federal payroll calculators covering all 50 US states and DC. 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