Everyday calculators for tips, ages, dates, and units.
Classic % calculations.
Add, subtract, multiply, and divide fractions.
Full expression evaluator with functions and constants.
Weighted GPA across up to 12 courses.
Add tax to a price or back it out of a total.
Tip and split the bill.
MPG, km/L, L/100km, and trip cost.
Fuel cost comparison over a multi-year horizon.
Length, weight, temperature, and more.
Convert a moment across multiple zones at once.
Your exact age plus zodiac and next birthday.
Business days, weeks, and midpoint between dates.
Convert between hex, RGB, and HSL color values.
WCAG contrast ratio with AA/AAA pass–fail.
Secure random numbers, passwords, and strings.
Live entropy and crack-time estimate, 100% client-side.
Generate a QR code from any text or URL.