Unit Converter (All-in-One)
One converter for everything: switch between length, weight, temperature, area, speed, digital storage and time, and see your value in every unit at once.
Convert
Length — Result
0.1 cm
1 Millimetre = 0.1 Centimetre
How It Works
This all-in-one converter bundles seven everyday categories — length, weight/mass, temperature, area, speed and digital storage — into one tool. Most conversions use a shared method: every unit is defined by a factor relative to a base unit (metre, gram, square metre, metre-per-second, byte), so converting means multiplying to the base and dividing to the target. Temperature is the exception: because scales have different zero points, it converts through Celsius using formulas rather than a single factor — °F = °C × 9/5 + 32, and Kelvin = °C + 273.15. Digital storage uses binary steps (1 KB = 1,024 bytes, 1 MB = 1,024 KB), the convention for memory and file sizes. Pick a category, enter a value, choose from/to units, and the full table updates instantly.
Formula
Non-temperature: result = value × (base per from-unit) ÷ (base per to-unit). Temperature converts via Celsius: °F = °C×9/5+32, K = °C+273.15.
Frequently Asked Questions
What units can this convert?
Seven categories: length (m, km, mi, ft, in…), weight/mass (kg, g, lb, oz, tonne…), temperature (°C, °F, K), area (m², acre, ha, ft²…), speed (km/h, mph, m/s, knot), digital storage (KB, MB, GB, TB…) and time (s, min, h, day…).
How does temperature conversion work?
Unlike other units, temperature scales have different zero points, so it can’t use a single multiplier. The tool converts to Celsius first, then to the target: °F = °C × 9/5 + 32, and Kelvin = °C + 273.15.
Is 1 KB equal to 1,000 or 1,024 bytes?
This converter uses the binary convention common for memory and file sizes: 1 KB = 1,024 bytes, 1 MB = 1,024 KB, and so on. (Some storage vendors use decimal 1,000-based units, which is why a "500 GB" drive shows less in your OS.)
How do I convert km/h to mph?
Select the Speed category and choose km/h → mph. The factor is 1 km/h = 0.621371 mph, so 100 km/h ≈ 62.14 mph.
What is the base unit each category uses?
Length → metre, weight → gram, area → square metre, speed → metre/second, storage → byte, time → second. Every unit is defined as a multiple of its base, which makes conversion a simple multiply-then-divide.