GrossWise is 30 free paycheck calculators for US workers: take-home pay, overtime, freelance rates, 1099 estimated taxes, side-hustle income, payment fees, and more. Every calculator ships with a plain-English guide — how the math works, a worked example, and the named sources behind the numbers (IRS, BLS, Upwork). No signup, no paywall; everything runs in your browser. Built for anyone who's stared at a pay stub and wondered where the money went.