Convert between units of length, weight, temperature, area, volume, data, speed and more. Instant, free, no login.
The Logrith Unit Converter is a free, all-in-one tool for converting values across ten different measurement categories — length, weight, temperature, area, volume, data size, speed, time, energy, and pressure. Rather than making you pick a single "from" and "to" unit and run the conversion repeatedly, it calculates every equivalent unit in the chosen category at once, so you get a complete reference table from a single input.
Unit conversion comes up constantly in everyday life and work — cooking with a recipe that uses cups when you only have a metric scale, checking a product's weight in pounds when the listing only gives kilograms, figuring out a temperature in Fahrenheit from a Celsius reading, or converting a file size between megabytes and gibibytes for storage planning. This tool is built to handle all of these cases from one interface, with results that update instantly as you type.
Most unit conversions in this tool are simple multiplication — multiply by a fixed conversion factor to move from one unit to another. Temperature is the exception, because the different scales don't all start counting from the same zero point. Celsius and Kelvin share the same size of degree but different starting points (0°C = 273.15K), while Fahrenheit uses both a different starting point and a different degree size entirely. Converting between them requires offset formulas — for example, Celsius to Fahrenheit is (°C × 9/5) + 32, not a straight multiplication. This tool applies the correct formula automatically for every temperature pair, so you never have to remember or calculate the offsets yourself.
Data size conversion has its own quirk worth understanding: there are two competing standards for units like kilobyte and megabyte. The SI (decimal) standard defines a kilobyte as exactly 1,000 bytes, which is what this tool uses for KB, MB, GB, and TB. The binary standard, used internally by operating systems and reflected in units like KiB, MiB, and GiB, defines a "kibibyte" as 1,024 bytes instead. This is exactly why a hard drive labeled "1TB" by its manufacturer (1,000,000,000,000 bytes, SI standard) shows up as roughly 931GB in your operating system (which measures using the binary standard but often still labels it GB). This converter includes both standards side by side so you can see exactly how a value differs between the two.
All conversions use standard, internationally recognized conversion factors rather than rounded approximations, so results stay accurate to several decimal places. For very small or very large results, the tool automatically switches to scientific notation to keep the number readable rather than showing a long string of leading or trailing zeros. Because every calculation happens directly in your browser using JavaScript, there's no server round-trip delay — results update the instant you change the value or unit.
No values you enter into this converter are uploaded, logged, or stored anywhere. The entire calculation runs locally in your browser tab, which means it works even with values you'd rather not send to an external server, and nothing persists once you close or refresh the page.
A few mistakes come up often enough with manual unit conversion that they're worth calling out specifically. One is applying a simple multiplication to temperature, forgetting that Fahrenheit and Celsius don't share a zero point — this alone causes some of the most common conversion errors people run into. Another is confusing the decimal and binary data standards, assuming 1GB always equals exactly 1024MB when, depending on context, it may mean 1000MB instead. A third is rounding too early in a multi-step manual conversion, which can compound small errors into a noticeably wrong final answer. Because this tool calculates every result directly from the base value using full precision, these kinds of compounding errors don't occur.