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99+ calculators optimized for American standards — US tax brackets, mortgage rates, imperial units, and FDA health guidelines.
Calculate monthly payments, amortization schedules, and total interest for US mortgages.
Plan your retirement contributions with employer matching and compound growth.
Estimate federal and state income taxes with standard or itemized deductions.
Check your Body Mass Index using CDC-standard height and weight formulas.
Calculate monthly payments and total cost for personal, auto, or student loans.
Convert between hourly, weekly, bi-weekly, and annual salary for US workers.
Feet, inches, pounds, Fahrenheit — default units match US standards.
Federal tax brackets, 401(k), IRA, Social Security calculations included.
Health calculators follow US clinical standards and recommendations.