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Convert length, weight, temperature, currency, datetime and more — instantly. Unitly is a fast, lightweight, all-in-one unit converter right in your browser toolbar. Click the icon, enter a value, and get instant results. No sign-up, no tracking. [18 CATEGORIES SUPPORTED] Length — km, m, cm, mm, mile, yard, foot, inch, nautical mile Weight — kg, g, mg, lb, oz, ton, stone Temperature — °C, °F, K Area — m², km², ft², acre, hectare, pyeong Volume — L, mL, gallon, cup, fl oz, tbsp, tsp Speed — km/h, m/s, mph, knot, Mach Time — ms, sec, min, hour, day, week, month, year Data Storage — bit, byte, KB, MB, GB, TB, PB Pressure — Pa, bar, atm, psi, mmHg Energy — J, cal, kcal, kWh, BTU Power — W, kW, MW, hp Angle — degree, radian, gradian Frequency — Hz, kHz, MHz, GHz, rpm Fuel Efficiency — km/L, L/100km, mpg Currency — Live exchange rates (powered by European Central Bank data) Date & Time — ISO 8601, Unix Timestamp, RFC 2822, and more Base Conversion — Decimal, Binary, Octal, Hexadecimal (supports 0b/0o/0x prefix auto-detection) Custom Formula — Define your own conversion formulas using math expressions (up to 10 saved) [KEY FEATURES] Real-time conversion — Results update as you type Multiple conversions — Convert to up to 3 units simultaneously Swap button — Instantly switch From and To units Copy result — One-click copy to clipboard Custom formulas — Save and reuse your own unit conversions with simple math expressions (e.g. x * 1.2) Auto-refresh rates — Exchange rates update every 10 minutes Offline support — Currency conversion works with cached data Clean UI — Simple, intuitive, distraction-free design Lightweight & Fast — Zero impact on browser performance Perfect for students, developers, travelers, engineers, and anyone who works with different units every day.