Length conversions
Length measures distance—from nanometres in materials science to light years in astronomy. This hub collects everyday and scientific length units so you can open any pair for formulas, tables, and high-precision conversion.
Tip: keep drawings in one system (metric or imperial) end-to-end. Convert only at the project boundary to avoid tolerance stack-ups. Dual-label heights and road distances when teams span countries.
Popular Length conversions
- Centimetre to Inch (International)
- Inch (International) to Centimetre
- Inch (International) to Foot (International)
- Millimetre to Inch (International)
- Inch (International) to Millimetre
- Meter to Foot (International)
- Foot (International) to Meter
- Kilometre to Mile (International)
- Mile (International) to Kilometre
- Centimetre to Foot (International)
- Foot (International) to Centimetre
- Meter to Yard (International)
- Yard (International) to Meter
- Meter to Kilometre
- Foot (International) to Inch (International)
- Yard (International) to Foot (International)
- Nanometre to Meter
- Light Year to Kilometre
All Length units
Select any unit to open the converter. You can change the target unit on the next screen.
- Planck Length
- Yoctometre
- Zeptometre
- Attometre
- Femtometre
- Picometre
- Bohr
- Ångström
- Nanometre
- Micrometre
- Millimetre
- Barleycorn
- Centimetre
- Inch (International)
- Decimetre
- Foot (International)
- Cubit
- Yard (International)
- Meter
- Ell
- Fathom
- Decametre
- Chain
- Hectometre
- Cable Length (International)
- Kilometre
- Mile (International)
- Nautical Mile (International)
- Megametre
- Gigametre
- Light Second
- Light Minute
- Astronomical Unit
- Light Hour
- Light Day
- Light Year
- Parsec
- Zettametre
- Yottametre
- Hubble Length
How our Length converter works
Every conversion goes through a carefully defined base unit for Length. We use arbitrary-precision decimal arithmetic so results stay stable for scientific work, homework, and professional estimates alike.
Open a conversion pair for formulas, a reference table, worked examples, and short FAQs tailored to those two units.
Common conversions
- Centimetre to Inch (International)
- Inch (International) to Centimetre
- Inch (International) to Foot (International)
- Millimetre to Inch (International)
- Inch (International) to Millimetre
- Meter to Foot (International)
- Foot (International) to Meter
- Kilometre to Mile (International)
- Mile (International) to Kilometre
- Centimetre to Foot (International)
- Foot (International) to Centimetre
- Meter to Yard (International)
- Yard (International) to Meter
- Meter to Kilometre
- Foot (International) to Inch (International)
- Yard (International) to Foot (International)
- Nanometre to Meter
- Light Year to Kilometre
- Celsius to Fahrenheit
- Fahrenheit to Celsius
- Celsius to Kelvin
- Kelvin to Celsius
- Fahrenheit to Kelvin
- Kelvin to Fahrenheit
- Square Metre to Square Foot
- Square Foot to Square Metre
- Acre to Hectare
- Hectare to Acre
- Square Kilometre to Square Mile
- Square Mile to Square Kilometre
- Square Inch to Square Centimetre
- Square Centimetre to Square Inch
- Square Metre to Hectare
- Acre to Square Metre
- Litre to Cubic Metre
- Cubic Metre to Litre
- Millimetre to Litre
- Litre to Millimetre
- Cup to Millimetre
- Millimetre to Cup
- Cubic Foot to Litre
- Litre to Cubic Foot
- Tablespoon (Metric) to Teaspoon (Metric)
- Teaspoon (Metric) to Tablespoon (Metric)
- Hectolitre to Litre
- Litre to Hectolitre
Precision Unit Converter: Metric, Imperial & Scientific
Quickly convert between hundreds of units across Length, Temperature, Area, and Volume. Whether you are a student, engineer, or hobbyist, our tool provides high-precision results for everything from everyday measurements to advanced scientific data.
Comprehensive Categories
- Length: Nanometres to Light Years and Planck Length.
- Temperature: Celsius, Fahrenheit, Kelvin, and Newton.
- Area: Square Meters, Acres, Hectares, and Barns.
- Volume: Litres, Cubic Inches, Gallons, and Millilitres.
Why Use Our Converter?
- Ultimate Precision: Powered by Decimal.js for zero rounding errors.
- Scientific Grade: Includes rare units like Bohr, Ångström, and Parsecs.
- Instant Results: Real-time conversion as you type.
- Mobile Friendly: Optimized for use on any device.
Our free online converter is the fastest way to switch between metric and imperial systems. Save time on complex math and get reliable conversions for school, lab work, or construction projects.