Mathematical Tools
What It Does
Converts a value between units of the same kind — length, mass, temperature, area, volume, speed, digital storage, and time — right in your browser. Shows the value in every unit of the category and exports the table. Nothing is uploaded.
How to Use It
- Pick a category (e.g. Length).
- Choose the from and to units, then type a value.
- Use ⇄ to swap the two units; adjust precision as needed.
- Copy any result or export the full table.
Options Explained
| Option | Description |
|---|---|
| Category | The measurement dimension; determines the available units. |
| From / To | The units to convert between; ⇄ swaps them. |
| Precision | How many significant digits to show. |
| Thousands | Group large integer parts with separators. |
| Show table | Toggle the “value in every unit” table and its export. |
About Unit Systems — SI, US Customary, and Binary vs Decimal
Most unit conversions are just multiplication: pick a common “base” unit for the dimension (meters for length, kilograms for mass), express both units as a multiple of it, and the conversion factor is the ratio between them. Temperature is the famous exception — Celsius, Fahrenheit, and Kelvin differ by both a scale and an offset (an affine relationship), which is why 0°C is 32°F, not 0°F, and why you can’t convert temperatures by a single multiply.
Two other gotchas are worth knowing. In computing, storage prefixes come in two families: the decimal SI prefixes (kilo = 1000, so 1 KB = 1000 bytes) and the binary IEC prefixes (kibi = 1024, so 1 KiB = 1024 bytes) — a difference that grows to about 10% by the terabyte, which is why a “1 TB” drive shows as roughly 931 GiB. And “gallons” aren’t universal: a US gallon (this tool’s default) is about 3.785 liters, while a UK imperial gallon is about 4.546 liters. Every conversion here uses precise constants and runs entirely on your device.