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66+ free calculators built for Americans — no sign-up, no ads, instant results. 💰 Finance: Mortgage, retirement, 401(k), compound interest, paycheck, overtime, debt payoff, net worth, Roth IRA 🩺 Health: BMI, TDEE, calories, macros, body fat, sleep cycles, water intake, pregnancy due date 🧮 Utility: Grade, GPA, tip, sales tax, square footage, age, discount Uses official IRS, CDC & FLSA formulas. Works as a PWA — installs like an app.
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