Unit Converter — Length, Weight, Temperature, Area, Volume, Speed & Data
Instantly convert between 7 unit categories: length (cm↔inch), weight (kg↔lb), temperature (°C↔°F), area (pyeong↔m²), volume, speed, and data (MB/GB/TB). Real-time bidirectional conversion with a visual comparison chart.
Popular Conversions
All unit comparison
Frequently Asked Questions
Q. How many centimeters are in an inch?
Exactly 2.54 cm = 1 inch. Conversely, 1 cm ≈ 0.394 inches. Use this tool for real-time bidirectional conversion.
Q. How many kilograms are in a pound?
1 lb ≈ 0.4536 kg. Conversely, 1 kg ≈ 2.205 lb. Useful for international flights and US travel.
Q. What is the Celsius to Fahrenheit formula?
°F = °C × 9/5 + 32. Reverse: °C = (°F − 32) × 5/9. Example: 100°C = 212°F, 37°C = 98.6°F.
Q. How many m² in one Pyeong?
1 Pyeong ≈ 3.306 m². Used in Korean real estate listings.
Q. How many MB in 1 GB?
1 GB = 1,024 MB (binary). Also: 1 TB = 1,024 GB, 1 MB = 1,024 KB.
Q. How do I convert miles to kilometers?
1 mile ≈ 1.609 km. Reverse: 1 km ≈ 0.621 miles. Handy for US/UK road signs.
How to Use
Click the category tab: Length, Weight, Temperature, Area, Volume, Speed, or Data.
Select the From unit and type a number. Results appear instantly.
Choose the To unit, or click ⇄ to swap directions.
The bar chart shows the equivalent value in every unit of the same category.
Expert Knowledge: Unit Converter — Length, Weight, Temperature, Area, Volume, Speed & Data
The International System of Units (SI) defines 7 base units: meter, kilogram, second, ampere, kelvin, mole, and candela. The US and UK still use the Imperial/US Customary system (inches, pounds, Fahrenheit) in daily life. In Korea, the SI system is legally mandated, but Pyeong (坪, ≈3.306 m²) and Jin (斤, 600 g) remain in common use for real estate and gold trade. Data units present a dual standard: SI-based (1 GB = 10⁹ bytes) used by storage manufacturers, versus binary IEC (1 GiB = 2³⁰ bytes = 1,073,741,824 bytes).
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