Unit converter
Different units. The same quantity, made simple.
How to use ↓No uploads or saved inputs. Use a decimal point and commas only for thousands groups. Examples: 1,234.5 or 1e3
Dual-unit ruler
Both scales show the same length in different units. Drag on the ruler or move the slider below.
An illustration for comparing units, not a calibrated ruler for measuring physical centimeters or inches on your screen.
Korean customary units: pyeong, geun and more
Choose pyeong under area; geun, don, nyang and gwan under mass; ja, chi and kan under length; and hop, doe and mal under volume. Use them as either source or target units.
1 pyeong ≈ 3.305785 m² · 1 geun = 600 g · 1 don = 3.75 g · 1 doe ≈ 1.803907 L
Customary conversions are for reference. Where conventions vary, such as for geun, check the selected basis against the actual metric label.
Conversion references: KRISS — Units and conversions
All units at a glance
See the same input in every unit of the selected category.
| Unit | Converted value |
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A simpler way to compare quantities.
Compare product dimensions, travel speeds and storage capacities.
- 01
Choose a category and units
Choose length, mass, temperature, area, volume, speed or data size. Swapping units keeps the input number unchanged.
- 02
Type a number for instant results
Changing the number or units updates the result and table. Invalid input clears previous results and disables copying.
- 03
Choose display precision and copy
Significant digits count meaningful digits, not decimal places. Copying includes only the displayed number, without the unit.
Similar names, different units.
1 in = 2.54 cm
0 °C = 32 °F = 273.15 K
1 MB = 1,000,000 B
1 MiB = 1,048,576 B
Conversion references: NIST SI conversion factors · Binary prefixes
Frequently asked questions
How do US and Imperial gallons differ?
A US liquid gallon is 3.785411784 L; an Imperial gallon is 4.54609 L. Fluid ounces are also distinguished. US dry measures are not supported.
Can I convert between mass and volume?
Kilograms measure mass; liters measure volume. Converting between categories requires density and is not supported. Ounces and pounds use avoirdupois mass, not troy measures for precious metals.
Can I enter negative or very large numbers?
Negative values are allowed only for temperature, never below absolute zero. This converts actual temperatures, not temperature differences. Results are floating-point approximations rounded to your chosen significant digits. Very large or small values use scientific notation; out-of-range calculations show an error.
Why are MB and MiB different?
kB, MB, GB and TB use powers of 1000; KiB, MiB, GiB and TiB use powers of 1024. One byte is eight bits. Fractional byte results are not rounded to whole bytes.