A one-stop converter for length, weight, temperature, area, volume, speed, time, energy, pressure and data — ten categories in a single interface.
This tool runs entirely in your browser — no data is sent to our servers. If JavaScript is disabled, the fully interactive version will not run; enable JavaScript to compute results.
When you need to convert several different things in a single sitting — say, mixing engineering specifications with imperial units and metric units — switching between separate calculators is annoying. The Universal Unit Converter keeps the same interface and lets you switch categories with one click.
The unit list covers everything most people need: length (from millimetres to miles), weight (milligrams to tons), area (square cm to hectares), volume (millilitres to gallons), speed (m/s to mph), time (milliseconds to weeks), energy (joules to kilowatt-hours), pressure (Pa to psi), and data (bytes to terabytes).
The result table shows every unit in the category at once, with the chosen highlight unit emphasised. This is helpful when you are comparing across units — for example, seeing a price per kg, per gram and per ton side by side.
Historical inconsistency. Computing has used 1 KB = 1,024 since the 1960s. Some hard-drive manufacturers use 1 KB = 1,000 to make storage numbers look bigger. The calculator uses the computing convention (1,024).
Temperature lives in the standard Unit Converter (with the special offset math). The Universal Unit Converter handles the categories that all use simple ratios.
6 decimal places. For most everyday use that is far more precision than needed. For scientific applications, the underlying conversion factors are accurate to many more digits.
The Universal Unit Converter lives alongside Age Calculator, Date Convert to Major Calendars, Date Count Calculator on the Productivity page. That landing page collects every productivity tool Dailiyo publishes, plus the editorial notes on formula sources, review cadence and how each result should (and should not) be interpreted. If a related productivity calculation isn't yet in the collection and you'd like to see it, drop a line via the contact page — the editorial team reviews every request and prioritises tools that come up most often in reader questions.