Unit Converter
Free online unit converter for length, weight, temperature, area, volume, speed and data storage. Instant metric to imperial conversion, right in your browser.
About the Unit Converter
A fast, distraction-free converter covering the seven unit categories people need most: length, weight, temperature, area, volume, speed and data storage. Type a value and the result appears instantly — no "Convert" button, no page reloads, no ads jumping the page.
Exact conversion factors
Everything is computed from official definitions: 1 inch is exactly 2.54 cm, 1 pound is exactly 0.45359237 kg, and data storage clearly separates decimal units (KB, MB, GB — powers of 1000) from binary units (KiB, MiB, GiB — powers of 1024), which is why a "500 GB" drive shows as ~465 GiB in your operating system.
Temperature is converted through Celsius as the base using the standard offsets (°F = °C × 9/5 + 32; K = °C + 273.15), so 32°F, 0°C and 273.15 K line up exactly.
Frequently asked questions
How do I convert miles to kilometers?
One mile is exactly 1.609344 kilometers. For quick mental math, multiply miles by 1.6 — 5 miles is roughly 8 km. This converter uses the exact factor automatically.
Why does my 1 TB hard drive show only 931 GB?
Drive makers label in decimal TB (10¹² bytes), while Windows displays binary tebibytes (2⁴⁰ bytes). 1 TB = 931 GiB. Both numbers describe the same drive; the converter translates between the two standards.
What is the difference between KB and KiB?
KB is the decimal kilobyte (1,000 bytes) defined by SI; KiB is the binary kibibyte (1,024 bytes). The binary prefixes (KiB, MiB, GiB) were introduced in 1998 precisely to end this confusion.
How accurate are the results?
The conversion factors are the exact legal or SI definitions, and the arithmetic runs in double precision. Any tiny difference from other converters comes from display rounding, not the math.