CalculatorFlux currently offers 163 free calculators across 8 categories: payroll and tax, finance and investment, health and fitness, construction and materials, education and GPA, math and science, food and cooking, and specialty tools. New calculators are added regularly.
Our most-used tools are the Illinois Paycheck Calculator, A1C Calculator, Square Footage Calculator, Period Calculator, Coast FIRE Calculator, and High School GPA Calculator. The paycheck calculators for all 50 US states are also among our highest-traffic pages.
Yes. All payroll and tax calculators use 2025-26 IRS withholding tables and current state tax rates. Health calculators use the latest published formulas from recognized medical authorities. We review every calculator at the start of each tax year.
No account is ever required. Every calculator on CalculatorFlux is fully accessible without signing up, logging in, or providing any personal information.
Yes. Every calculator is fully responsive and works on all screen sizes including phones and tablets. No app download is needed.