All-in-One Unit Converter — 100+ units across 12 categories on one screen
This tool handles everyday conversions for length, weight, area, volume, temperature, speed, time, data, pressure, energy, power, and angle — all in a single app. It is useful for students, home cooks, developers, and engineers who need to turn meters into feet, calories into kilowatt-hours, or square meters into pyeong. There is no calculator to tap or search to run: type a value and the answer appears instantly.
How to use
- Pick the category you need (for example Length or Weight) from the top tabs.
- Enter a value, then choose the source unit and the target unit.
- The result shows immediately in large type.
- Press the ⇄ button to flip the two units and reverse the direction.
- Check the grid below to see the same value converted into every unit in that category at once.
Features & tips
- Includes Korean traditional units such as pyeong, don, geun, and doe alongside metric and imperial ones.
- Temperature uses exact formulas, not simple ratios, to convert Celsius, Fahrenheit, and Kelvin.
- Very large or small results, like light-years or electronvolts, switch to clean exponential notation.
- The Data category distinguishes decimal KB/MB from binary KiB/MiB (base 1024).
FAQ
Q. Does it work without an internet connection? A. All conversions run inside your browser, so once the page is loaded it works offline.
Q. Why does a result appear in exponential (e) form? A. When a number has too many digits, it automatically switches to exponential notation for readability.
Q. Are there rounding errors in long decimals? A. Results are rounded to 12 significant figures to clean up floating-point noise.
