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Universal Unit Converter

Quickly convert between units of length, weight, volume, energy, temperature, speed, area, pressure, data storage, and number bases in a clean, mobile-friendly interface.

Universal Unit Converter

Choose a category, enter a value, and instantly convert between units. Everything runs locally in your browser with no data sent to a server.

Conversions update automatically as you type or change units.

Convert to all units in this category

Enter a value above to see how it looks in every unit for this category.

Favorite pairs

Save frequently used conversions here, such as miles ↔ kilometers or Fahrenheit ↔ Celsius.

Why a good unit converter matters

Units show up everywhere: in recipes, DIY projects, homework, lab reports, engineering specs, and software. A good unit converter should feel instant, be easy to use on a phone or laptop, and cover the most common categories without forcing you through complex menus or ads. This Universal Unit Converter is designed to be that everyday tool—fast, focused, and fully client-side.

Supported categories and common conversions

The converter organizes units into clear categories so you can jump directly to what you need. Length covers meters, kilometers, centimeters, inches, feet, yards, and miles, so you can switch between metric and imperial without thinking about factors of 2.54 or 1.609. Weight includes grams, kilograms, pounds, ounces, and metric tons, which is useful for cooking, shipping, and fitness tracking.

Volume lets you convert between liters, milliliters, US gallons, cups, tablespoons, and teaspoons, making it easy to adapt recipes from one measurement system to another. Speed supports meters per second, kilometers per hour, miles per hour, and knots for everything from browser-based physics problems to real-world driving and aviation examples. Area and pressure include square meters, acres, hectares, psi, bar, kilopascals, and atmospheres—handy in engineering, environmental science, or tire and fluid calculations.

How temperature conversion works

Temperature is one of the most commonly converted quantities, and it is also one of the easiest to get slightly wrong in your head. This converter treats Celsius, Fahrenheit, and Kelvin using their proper formulas instead of simple scale factors. That means it correctly handles the offset between Celsius and Fahrenheit (the +32 step) and the absolute-zero offset between Celsius and Kelvin (+273.15).

Under the hood, the tool converts any temperature to Celsius as a neutral “base,” then converts from Celsius to your target unit. This matches how many textbooks define the relationships between scales and makes it easy to reason about. In the interface, you simply choose your source and target units, type a value, and read the result—no mental algebra required.

Data unit conversions: bytes, KB, MB, GB, TB

Data storage can be confusing because many systems mix decimal (10³) and binary (2¹⁰) prefixes. A “kilobyte” might mean 1,000 bytes or 1,024 bytes depending on context, and the same applies to megabytes and gigabytes. This converter supports both decimal units (kB, MB, GB, TB) and binary units (KiB, MiB, GiB) so you can see both views at once.

When planning backups, estimating download times, or interpreting disk usage reports, this distinction matters. By converting your value to a canonical byte representation first, then showing it in all the other units, the tool helps you understand how a single file size or storage quota looks across the different naming schemes used by operating systems and vendors.

Number base conversions: binary, decimal, hex

Programmers, electronics students, and anyone working close to hardware often switch between binary, octal, decimal, and hexadecimal representations of the same value. This converter includes a dedicated “Number bases” category that parses your input in one base and formats it in another. For example, you can paste a hex value like FF and instantly see its decimal and binary equivalents.

The tool validates digits based on the chosen base, so binary input accepts only 0s and 1s, octal accepts 0–7, decimal accepts 0–9, and hex allows 0–9 and A–F. This reduces subtle mistakes and makes it a handy teaching aid in computer science or digital logic classes. You can also save favorite base pairs—like binary ↔ hex—to jump into common conversions quickly.

Privacy and offline behavior

Like other tools in LifeHackToolbox, this converter runs entirely in your browser. Values never leave your device, so you can safely paste sensitive measurements, lab results, or internal numbers without worrying about uploads or tracking. Basic preferences such as favorite unit pairs are stored in your browser's local storage to keep the experience snappy, even if your connection is slow or temporarily offline.

If you are building a workflow around this, you might pair it with other calculators and helpers in the toolkit. For example, you can use the Time Duration Calculator for scheduling and elapsed-time problems, the Interactive Periodic Table for chemistry work, or other finance and math tools as they are added. All of them share the same principles: no sign-up, no server-side storage, and a focus on fast, focused everyday problem solving.