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Your All‑In‑One Online Tool Hub
Your All‑In‑One Online Tool Hub
A complete suite of online unit and conversion tools for students, engineers, developers, and everyday users. Convert temperatures, switch between metric and standard units, convert lengths, weights, speeds, areas, and volumes, look up time zones, decode Unix timestamps, and translate color values between HEX, RGB, and HSL.
Who This Is ForThese twelve converters change a value from one unit to another without changing what it measures. Most handle one kind of measurement in depth, such as length, weight, temperature or speed. Others convert time, number systems and color. Most of them also show the formula behind the conversion.
Search the converters below, or read the full guide ↓.
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The Metric to US Standard converter is the quickest choice for everyday conversions. It covers eight kinds of measurement, including pressure and time, on one page. The dedicated converters are for more units or more precision. The Length Converter handles more than 60 units, from angstroms to light years, including nautical and historical units. The Weight Converter separates the ordinary ounce from the troy ounce used for precious metals and the apothecaries' units found in older pharmacy texts.
Several units have the same name but different sizes, and that is where conversions most often go wrong. A US gallon is smaller than a UK imperial gallon, and the US dry gallon is different again. The Liters to Gallons converter keeps all three apart. The Volume Converter does the same for cups, pints and fluid ounces, which matters when following a recipe from another country. A nautical mile is longer than a statute mile, and a metric ton is heavier than a US ton.
The Area Converter moves between square feet, square meters, acres and hectares, which are the units used for floor plans and land. The Temperature Converter shows Celsius, Fahrenheit, Kelvin and Rankine together and works through each formula step by step. The Speed Converter covers road, sea and air units, including knots and Mach. Its reference tables include the Beaufort wind scale and familiar real-world speeds.
The Unix Timestamp Converter turns the long numbers that systems use to record time into readable dates. It detects whether a value is in seconds or milliseconds, a common reason a converted date comes out wrong. The Time Zone Converter accounts for daylight saving time, shows live clocks, and creates a link that can be shared, so a meeting time reads correctly for everyone.
The Number Base Converter converts between binary, octal, decimal, hexadecimal and any base from 2 to 36, and it shows the working step by step. Its bit grid flips individual bits, which is useful when reading flags or permissions. The Color Converter translates a color between HEX, RGB, HSL and several other models. It checks whether text and background colors meet WCAG contrast guidelines, and it previews how a color appears to people with common forms of color blindness.