Unit converter
From distances to floor areas, enter a number for an instant conversion.
Unit definitions
Values in the definition list are rounded to 12 significant digits for display. Calculations use the exact definitions (pyeong is 400/121).
Favorite unit pairs
Only saved pairs are stored in this browser, up to 20. Your numbers are not saved.
Enter a number to start converting.
Most results show up to 12 significant digits. Very large or small results use scientific notation. Display rounding does not affect intermediate calculations.
How to use the unit converter
Convert product dimensions and weights, weather temperatures, or floor areas into familiar units.
Choose a category, enter a value, and select source and target units. Copy the result or save a frequently used pair.
Examples: 1 inch is 2.54 cm, 32°F is 0°C, and 121 pyeong is 400 m².
How are pyeong and square meters related?
One pyeong is defined as exactly 400/121 m². For property contracts, check the officially stated area.
Can I convert Japanese tsubo or tatami?
The Japanese tsubo has the same definition as the Korean pyeong (1 pyeong = 400/121 m²), so it can be used as is. Tatami are excluded because their size varies by region and standard (1.62 m² and other values are used), so there is no single definition.
Can I convert a temperature difference?
No. This tool converts actual temperatures. A 10°C difference is an 18°F difference, but an actual temperature of 10°C is 50°F.