American-themed calculators and tools designed for the United States. From flag proportions to US taxes, time zones, and standard measurements — everything you need, using the system you know.
Calculate American flag proportions and patriotic symbol measurements
Tools for US time zones, military time, and federal holidays
Convert between US time zones (EST, CST, MST, PST)
Convert between 12-hour and 24-hour (military) time
Calculate dates for US holidays and events
Find days between two dates
Calculate work hours, time cards
Convert between US customary and metric measurement systems
Convert inches to feet and vice versa
Convert US feet to metric meters
Convert miles to kilometers for road trips
Convert US pounds to metric kilograms
Convert US gallons to liters
Convert US Fahrenheit to Celsius
Convert US fluid ounces to milliliters
Convert US cups to milliliters for cooking
American tax, savings, retirement, and mortgage calculators
Estimate US federal income tax
Calculate sales tax by US state
Calculate US mortgage payments
Plan US retirement savings
Estimate Social Security benefits
Calculate US net pay after taxes
Calculate US student loan payments
Plan US traditional and Roth IRA
Calculate how much house you can afford
American GPA, grade, and test score calculators
American construction, home improvement, and DIY calculators
American health metrics using US standard measurements
American driving, fuel, and vehicle calculators
All calculators use US standard units — inches, feet, pounds, gallons, Fahrenheit — no metric conversions needed.
US tax brackets, state sales tax rates, time zones, federal holidays, and American standards built in.
All American calculators are completely free. No registration, no limits, no hidden fees. Just practical tools.