NN666Scale

Convert everyday measurements quickly, even when you are offline. Explore eight useful categories: length, area, volume, mass, temperature, speed, time, and data.

Enter a value and choose its source and target units to see an immediate result. Search unit names and abbreviations, swap a pair with one tap, or compare several selected units together. Copy an individual answer or a complete set of results as plain text.

Results use high-precision calculations and clear, configurable rounding. Choose from 2 to 10 decimal places and enable scientific notation for especially large or small values. Temperature conversions account for the offset between Celsius, Fahrenheit, and Kelvin scales.

Save favorite unit pairs to reuse with a different input value. Optional recent history can be searched, removed one record at a time, or cleared. Your preferences, saved pairs, and history remain in local app storage on your device.

Adjust the default category, light or dark theme, text size, and one-hand layout. Built-in guidance explains input ranges, abbreviations, and rounding. No account or network connection is needed for conversion.