Every calculator you'll ever need

Articles & Guides

In-depth guides on finance, health, and more.

Yes, completely free. Every calculator on CalculatorFlux requires no account, no subscription, and no payment. We plan to keep all tools free forever.

Yes. CalculatorFlux has individual paycheck calculators for all 50 US states plus Washington DC. Each calculator applies the correct state income tax brackets, flat rates, and local taxes for 2025-26. States with no income tax, Texas, Florida, Nevada, Washington, Wyoming, South Dakota, Alaska, Tennessee, and New Hampshire, show federal-only take-home calculations.

Payroll calculators use the current IRS Publication 15-T federal withholding tables and each state's official published tax rates for 2025-26. They are reviewed by a licensed CPA and updated within two weeks of any IRS or state revenue department announcement. All results are estimates based on standard withholding, your actual paycheck may differ if your employer uses supplemental methods or if you have additional withholding elections.

No. Every calculator runs entirely in your browser. Your inputs never reach our servers. We do not log, store, or sell any calculation data.

All payroll and tax calculators are reviewed at the start of each tax year and updated within two weeks of any IRS publication or state revenue department announcement. Health and finance calculators use formulas from the ADA, WHO, CDC, and standard financial industry references, updated as guidelines change.

CalculatorFlux covers eight categories: Payroll & Tax (50+ state and federal tools), Finance & Investment (mortgage, FIRE, retirement, IRR), Health & Fitness (A1C, period, VO2 max, calorie), Construction & Materials (square footage, concrete, roofing), Education & GPA (high school GPA, SAT, LSAT, AP scores), Math & Science (matrix determinant, partial derivatives, statistics), Food & Cooking (pizza, turkey, recipe scaling), and Specialty (ERA, RVU, crosswind, zakat).