Free Calculators for the United States
150+ calculators optimized for American standards — US tax brackets, mortgage rates, imperial units, and FDA health guidelines.
Most Popular US Calculators
Mortgage Calculator
Calculate monthly payments, amortization schedules, and total interest for US mortgages.
401(k) Calculator
Plan your retirement contributions with employer matching and compound growth.
Income Tax Calculator
Estimate federal and state income taxes with standard or itemized deductions.
BMI Calculator
Check your Body Mass Index using CDC-standard height and weight formulas.
Loan Calculator
Calculate monthly payments and total cost for personal, auto, or student loans.
Paycheck Calculator
Convert between hourly, weekly, bi-weekly, and annual salary for US workers.
Built for American Users
Imperial Units
Feet, inches, pounds, Fahrenheit — default units match US standards.
US Tax & Finance
Federal tax brackets, 401(k), IRA, Social Security calculations included.
FDA & CDC Guidelines
Health calculators follow US clinical standards and recommendations.