All United States Online Tools

Browse free, client-side financial and utility calculators optimized for United States standards and currency (USD).

United States Tools

Add or reverse calculate sales tax based on your local state & city rate.

Calculate gratuity and split bills easily among your dining party.

Solve any percentage problem: percentage of, percentage change, and ratios.

Find your exact age in years, months and days, plus milestone stats.

Check your Body Mass Index and healthy weight category instantly.

Find the duration between two calendar dates in days, weeks and months.

Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) instantly.

Live count of words, characters, sentences, paragraphs and reading time.

Generate clean, customizable QR codes for links, Wi-Fi, text and contacts.

Scan QR codes using your camera or upload an image. Fast & private.

Create cryptographically secure, random passwords with custom settings.

See how compounding grows your money over time with customizable frequencies.

Calculate your fixed monthly loan payment and view the complete amortization table.

Create professional invoices with custom currency, tax options, and instant PDF download.