Length convert.conversions
31 conversions length units supported.
Popular Length Conversions
Centimeter to Inchcm -> in
Inch to Centimeterin -> cm
Meter to Footm -> ft
Foot to Meterft -> m
Kilometer to Milekm -> mi
Mile to Kilometermi -> km
Yard to Meteryd -> m
Meter to Yardm -> yd
Millimeter to Inchmm -> in
Inch to Millimeterin -> mm
Foot to Inchft -> in
Inch to Footin -> ft
Centimeter to Metercm -> m
Meter to Centimeterm -> cm
Centimeter to Footcm -> ft
Foot to Centimeterft -> cm
Centimeter to Millimetercm -> mm
Millimeter to Centimetermm -> cm
Meter to Kilometerm -> km
Kilometer to Meterkm -> m
Nautical Mile to Kilometernmi -> km
Nautical Mile to Milenmi -> mi
Mile to Footmi -> ft
Yard to Footyd -> ft
Foot to Yardft -> yd
Micrometer to Millimeterµm -> mm
Micrometer to Inchµm -> in
Light Year to Kilometerly -> km
Parsec to Light Yearpc -> ly
Fathom to Footftm -> ft
Furlong to Milefur -> mi
League to Milelea -> mi
All Length Units
Click any conversion below to open the dedicated calculator with detailed formulas, conversion tables, and common values.
Meter -> KilometerMeter -> CentimeterMeter -> MillimeterMeter -> MicrometerMeter -> NanometerMeter -> AngstromMeter -> MileMeter -> YardMeter -> FootMeter -> InchMeter -> Nautical MileMeter -> FathomMeter -> FurlongMeter -> ChainMeter -> RodMeter -> LeagueMeter -> Light YearMeter -> ParsecMeter -> Astronomical UnitMeter -> Mil/ThouMeter -> MicroinchMeter -> PicometerMeter -> FermiMeter -> CubitMeter -> HandMeter -> SpanMeter -> Link (Gunter)Meter -> DecimeterMeter -> DekameterMeter -> HectometerKilometer -> MeterKilometer -> CentimeterKilometer -> MillimeterKilometer -> MicrometerKilometer -> NanometerKilometer -> AngstromKilometer -> MileKilometer -> YardKilometer -> FootKilometer -> InchKilometer -> Nautical MileKilometer -> FathomKilometer -> FurlongKilometer -> ChainKilometer -> RodKilometer -> LeagueKilometer -> Light YearKilometer -> ParsecKilometer -> Astronomical UnitKilometer -> Mil/ThouKilometer -> MicroinchKilometer -> PicometerKilometer -> FermiKilometer -> CubitKilometer -> HandKilometer -> SpanKilometer -> Link (Gunter)Kilometer -> DecimeterKilometer -> DekameterKilometer -> HectometerCentimeter -> MeterCentimeter -> KilometerCentimeter -> MillimeterCentimeter -> MicrometerCentimeter -> NanometerCentimeter -> AngstromCentimeter -> MileCentimeter -> YardCentimeter -> FootCentimeter -> InchCentimeter -> Nautical MileCentimeter -> FathomCentimeter -> FurlongCentimeter -> ChainCentimeter -> RodCentimeter -> LeagueCentimeter -> Light YearCentimeter -> ParsecCentimeter -> Astronomical UnitCentimeter -> Mil/ThouCentimeter -> MicroinchCentimeter -> PicometerCentimeter -> FermiCentimeter -> CubitCentimeter -> HandCentimeter -> SpanCentimeter -> Link (Gunter)Centimeter -> DecimeterCentimeter -> DekameterCentimeter -> HectometerMillimeter -> MeterMillimeter -> KilometerMillimeter -> CentimeterMillimeter -> MicrometerMillimeter -> NanometerMillimeter -> AngstromMillimeter -> MileMillimeter -> YardMillimeter -> FootMillimeter -> InchMillimeter -> Nautical MileMillimeter -> FathomMillimeter -> FurlongMillimeter -> ChainMillimeter -> RodMillimeter -> LeagueMillimeter -> Light YearMillimeter -> ParsecMillimeter -> Astronomical UnitMillimeter -> Mil/ThouMillimeter -> MicroinchMillimeter -> PicometerMillimeter -> FermiMillimeter -> CubitMillimeter -> HandMillimeter -> SpanMillimeter -> Link (Gunter)Millimeter -> DecimeterMillimeter -> DekameterMillimeter -> HectometerMicrometer -> MeterMicrometer -> KilometerMicrometer -> CentimeterMicrometer -> MillimeterMicrometer -> NanometerMicrometer -> AngstromMicrometer -> MileMicrometer -> YardMicrometer -> FootMicrometer -> InchMicrometer -> Nautical MileMicrometer -> FathomMicrometer -> FurlongMicrometer -> ChainMicrometer -> RodMicrometer -> LeagueMicrometer -> Light YearMicrometer -> ParsecMicrometer -> Astronomical UnitMicrometer -> Mil/ThouMicrometer -> MicroinchMicrometer -> PicometerMicrometer -> FermiMicrometer -> CubitMicrometer -> HandMicrometer -> SpanMicrometer -> Link (Gunter)Micrometer -> DecimeterMicrometer -> DekameterMicrometer -> HectometerNanometer -> MeterNanometer -> KilometerNanometer -> CentimeterNanometer -> MillimeterNanometer -> MicrometerNanometer -> AngstromNanometer -> MileNanometer -> YardNanometer -> FootNanometer -> InchNanometer -> Nautical MileNanometer -> FathomNanometer -> FurlongNanometer -> ChainNanometer -> RodNanometer -> LeagueNanometer -> Light YearNanometer -> ParsecNanometer -> Astronomical UnitNanometer -> Mil/ThouNanometer -> MicroinchNanometer -> PicometerNanometer -> FermiNanometer -> CubitNanometer -> HandNanometer -> SpanNanometer -> Link (Gunter)Nanometer -> DecimeterNanometer -> DekameterNanometer -> HectometerAngstrom -> MeterAngstrom -> KilometerAngstrom -> CentimeterAngstrom -> MillimeterAngstrom -> MicrometerAngstrom -> NanometerAngstrom -> MileAngstrom -> YardAngstrom -> FootAngstrom -> InchAngstrom -> Nautical MileAngstrom -> FathomAngstrom -> FurlongAngstrom -> ChainAngstrom -> RodAngstrom -> LeagueAngstrom -> Light YearAngstrom -> ParsecAngstrom -> Astronomical UnitAngstrom -> Mil/ThouAngstrom -> MicroinchAngstrom -> PicometerAngstrom -> FermiAngstrom -> CubitAngstrom -> HandAngstrom -> SpanAngstrom -> Link (Gunter)Angstrom -> DecimeterAngstrom -> DekameterAngstrom -> HectometerMile -> MeterMile -> KilometerMile -> CentimeterMile -> MillimeterMile -> MicrometerMile -> NanometerMile -> AngstromMile -> YardMile -> FootMile -> InchMile -> Nautical MileMile -> FathomMile -> FurlongMile -> ChainMile -> RodMile -> LeagueMile -> Light YearMile -> ParsecMile -> Astronomical UnitMile -> Mil/ThouMile -> MicroinchMile -> PicometerMile -> FermiMile -> CubitMile -> HandMile -> SpanMile -> Link (Gunter)Mile -> DecimeterMile -> DekameterMile -> HectometerYard -> MeterYard -> KilometerYard -> CentimeterYard -> MillimeterYard -> MicrometerYard -> NanometerYard -> AngstromYard -> MileYard -> FootYard -> InchYard -> Nautical MileYard -> FathomYard -> FurlongYard -> ChainYard -> RodYard -> LeagueYard -> Light YearYard -> ParsecYard -> Astronomical UnitYard -> Mil/ThouYard -> MicroinchYard -> PicometerYard -> FermiYard -> CubitYard -> HandYard -> SpanYard -> Link (Gunter)Yard -> DecimeterYard -> DekameterYard -> HectometerFoot -> MeterFoot -> KilometerFoot -> CentimeterFoot -> MillimeterFoot -> MicrometerFoot -> NanometerFoot -> AngstromFoot -> MileFoot -> YardFoot -> InchFoot -> Nautical MileFoot -> FathomFoot -> FurlongFoot -> ChainFoot -> RodFoot -> LeagueFoot -> Light YearFoot -> ParsecFoot -> Astronomical UnitFoot -> Mil/ThouFoot -> MicroinchFoot -> PicometerFoot -> FermiFoot -> CubitFoot -> HandFoot -> SpanFoot -> Link (Gunter)Foot -> DecimeterFoot -> DekameterFoot -> HectometerInch -> MeterInch -> KilometerInch -> CentimeterInch -> MillimeterInch -> MicrometerInch -> NanometerInch -> AngstromInch -> MileInch -> YardInch -> FootInch -> Nautical MileInch -> FathomInch -> FurlongInch -> ChainInch -> RodInch -> LeagueInch -> Light YearInch -> ParsecInch -> Astronomical UnitInch -> Mil/ThouInch -> MicroinchInch -> PicometerInch -> FermiInch -> CubitInch -> HandInch -> SpanInch -> Link (Gunter)Inch -> DecimeterInch -> DekameterInch -> HectometerNautical Mile -> MeterNautical Mile -> KilometerNautical Mile -> CentimeterNautical Mile -> MillimeterNautical Mile -> MicrometerNautical Mile -> NanometerNautical Mile -> AngstromNautical Mile -> MileNautical Mile -> YardNautical Mile -> FootNautical Mile -> InchNautical Mile -> FathomNautical Mile -> FurlongNautical Mile -> ChainNautical Mile -> RodNautical Mile -> LeagueNautical Mile -> Light YearNautical Mile -> ParsecNautical Mile -> Astronomical UnitNautical Mile -> Mil/ThouNautical Mile -> MicroinchNautical Mile -> PicometerNautical Mile -> FermiNautical Mile -> CubitNautical Mile -> HandNautical Mile -> SpanNautical Mile -> Link (Gunter)Nautical Mile -> DecimeterNautical Mile -> DekameterNautical Mile -> HectometerFathom -> MeterFathom -> KilometerFathom -> CentimeterFathom -> MillimeterFathom -> MicrometerFathom -> NanometerFathom -> AngstromFathom -> MileFathom -> YardFathom -> FootFathom -> InchFathom -> Nautical MileFathom -> FurlongFathom -> ChainFathom -> RodFathom -> LeagueFathom -> Light YearFathom -> ParsecFathom -> Astronomical UnitFathom -> Mil/ThouFathom -> MicroinchFathom -> PicometerFathom -> FermiFathom -> CubitFathom -> HandFathom -> SpanFathom -> Link (Gunter)Fathom -> DecimeterFathom -> DekameterFathom -> HectometerFurlong -> MeterFurlong -> KilometerFurlong -> CentimeterFurlong -> MillimeterFurlong -> MicrometerFurlong -> NanometerFurlong -> AngstromFurlong -> MileFurlong -> YardFurlong -> FootFurlong -> InchFurlong -> Nautical MileFurlong -> FathomFurlong -> ChainFurlong -> RodFurlong -> LeagueFurlong -> Light YearFurlong -> ParsecFurlong -> Astronomical UnitFurlong -> Mil/ThouFurlong -> MicroinchFurlong -> PicometerFurlong -> FermiFurlong -> CubitFurlong -> HandFurlong -> SpanFurlong -> Link (Gunter)Furlong -> DecimeterFurlong -> DekameterFurlong -> HectometerChain -> MeterChain -> KilometerChain -> CentimeterChain -> MillimeterChain -> MicrometerChain -> NanometerChain -> AngstromChain -> MileChain -> YardChain -> FootChain -> InchChain -> Nautical MileChain -> FathomChain -> FurlongChain -> RodChain -> LeagueChain -> Light YearChain -> ParsecChain -> Astronomical UnitChain -> Mil/ThouChain -> MicroinchChain -> PicometerChain -> FermiChain -> CubitChain -> HandChain -> SpanChain -> Link (Gunter)Chain -> DecimeterChain -> DekameterChain -> HectometerRod -> MeterRod -> KilometerRod -> CentimeterRod -> MillimeterRod -> MicrometerRod -> NanometerRod -> AngstromRod -> MileRod -> YardRod -> FootRod -> InchRod -> Nautical MileRod -> FathomRod -> FurlongRod -> ChainRod -> LeagueRod -> Light YearRod -> ParsecRod -> Astronomical UnitRod -> Mil/ThouRod -> MicroinchRod -> PicometerRod -> FermiRod -> CubitRod -> HandRod -> SpanRod -> Link (Gunter)Rod -> DecimeterRod -> DekameterRod -> HectometerLeague -> MeterLeague -> KilometerLeague -> CentimeterLeague -> MillimeterLeague -> MicrometerLeague -> NanometerLeague -> AngstromLeague -> MileLeague -> YardLeague -> FootLeague -> InchLeague -> Nautical MileLeague -> FathomLeague -> FurlongLeague -> ChainLeague -> RodLeague -> Light YearLeague -> ParsecLeague -> Astronomical UnitLeague -> Mil/ThouLeague -> MicroinchLeague -> PicometerLeague -> FermiLeague -> CubitLeague -> HandLeague -> SpanLeague -> Link (Gunter)League -> DecimeterLeague -> DekameterLeague -> HectometerLight Year -> MeterLight Year -> KilometerLight Year -> CentimeterLight Year -> MillimeterLight Year -> MicrometerLight Year -> NanometerLight Year -> AngstromLight Year -> MileLight Year -> YardLight Year -> FootLight Year -> InchLight Year -> Nautical MileLight Year -> FathomLight Year -> FurlongLight Year -> ChainLight Year -> RodLight Year -> LeagueLight Year -> ParsecLight Year -> Astronomical UnitLight Year -> Mil/ThouLight Year -> MicroinchLight Year -> PicometerLight Year -> FermiLight Year -> CubitLight Year -> HandLight Year -> SpanLight Year -> Link (Gunter)Light Year -> DecimeterLight Year -> DekameterLight Year -> HectometerParsec -> MeterParsec -> KilometerParsec -> CentimeterParsec -> MillimeterParsec -> MicrometerParsec -> NanometerParsec -> AngstromParsec -> MileParsec -> YardParsec -> FootParsec -> InchParsec -> Nautical MileParsec -> FathomParsec -> FurlongParsec -> ChainParsec -> RodParsec -> LeagueParsec -> Light YearParsec -> Astronomical UnitParsec -> Mil/ThouParsec -> MicroinchParsec -> PicometerParsec -> FermiParsec -> CubitParsec -> HandParsec -> SpanParsec -> Link (Gunter)Parsec -> DecimeterParsec -> DekameterParsec -> HectometerAstronomical Unit -> MeterAstronomical Unit -> KilometerAstronomical Unit -> CentimeterAstronomical Unit -> MillimeterAstronomical Unit -> MicrometerAstronomical Unit -> NanometerAstronomical Unit -> AngstromAstronomical Unit -> MileAstronomical Unit -> YardAstronomical Unit -> FootAstronomical Unit -> InchAstronomical Unit -> Nautical MileAstronomical Unit -> FathomAstronomical Unit -> FurlongAstronomical Unit -> ChainAstronomical Unit -> RodAstronomical Unit -> LeagueAstronomical Unit -> Light YearAstronomical Unit -> ParsecAstronomical Unit -> Mil/ThouAstronomical Unit -> MicroinchAstronomical Unit -> PicometerAstronomical Unit -> FermiAstronomical Unit -> CubitAstronomical Unit -> HandAstronomical Unit -> SpanAstronomical Unit -> Link (Gunter)Astronomical Unit -> DecimeterAstronomical Unit -> DekameterAstronomical Unit -> HectometerMil/Thou -> MeterMil/Thou -> KilometerMil/Thou -> CentimeterMil/Thou -> MillimeterMil/Thou -> MicrometerMil/Thou -> NanometerMil/Thou -> AngstromMil/Thou -> MileMil/Thou -> YardMil/Thou -> FootMil/Thou -> InchMil/Thou -> Nautical MileMil/Thou -> FathomMil/Thou -> FurlongMil/Thou -> ChainMil/Thou -> RodMil/Thou -> LeagueMil/Thou -> Light YearMil/Thou -> ParsecMil/Thou -> Astronomical UnitMil/Thou -> MicroinchMil/Thou -> PicometerMil/Thou -> FermiMil/Thou -> CubitMil/Thou -> HandMil/Thou -> SpanMil/Thou -> Link (Gunter)Mil/Thou -> DecimeterMil/Thou -> DekameterMil/Thou -> HectometerMicroinch -> MeterMicroinch -> KilometerMicroinch -> CentimeterMicroinch -> MillimeterMicroinch -> MicrometerMicroinch -> NanometerMicroinch -> AngstromMicroinch -> MileMicroinch -> YardMicroinch -> FootMicroinch -> InchMicroinch -> Nautical MileMicroinch -> FathomMicroinch -> FurlongMicroinch -> ChainMicroinch -> RodMicroinch -> LeagueMicroinch -> Light YearMicroinch -> ParsecMicroinch -> Astronomical UnitMicroinch -> Mil/ThouMicroinch -> PicometerMicroinch -> FermiMicroinch -> CubitMicroinch -> HandMicroinch -> SpanMicroinch -> Link (Gunter)Microinch -> DecimeterMicroinch -> DekameterMicroinch -> HectometerPicometer -> MeterPicometer -> KilometerPicometer -> CentimeterPicometer -> MillimeterPicometer -> MicrometerPicometer -> NanometerPicometer -> AngstromPicometer -> MilePicometer -> YardPicometer -> FootPicometer -> InchPicometer -> Nautical MilePicometer -> FathomPicometer -> FurlongPicometer -> ChainPicometer -> RodPicometer -> LeaguePicometer -> Light YearPicometer -> ParsecPicometer -> Astronomical UnitPicometer -> Mil/ThouPicometer -> MicroinchPicometer -> FermiPicometer -> CubitPicometer -> HandPicometer -> SpanPicometer -> Link (Gunter)Picometer -> DecimeterPicometer -> DekameterPicometer -> HectometerFermi -> MeterFermi -> KilometerFermi -> CentimeterFermi -> MillimeterFermi -> MicrometerFermi -> NanometerFermi -> AngstromFermi -> MileFermi -> YardFermi -> FootFermi -> InchFermi -> Nautical MileFermi -> FathomFermi -> FurlongFermi -> ChainFermi -> RodFermi -> LeagueFermi -> Light YearFermi -> ParsecFermi -> Astronomical UnitFermi -> Mil/ThouFermi -> MicroinchFermi -> PicometerFermi -> CubitFermi -> HandFermi -> SpanFermi -> Link (Gunter)Fermi -> DecimeterFermi -> DekameterFermi -> HectometerCubit -> MeterCubit -> KilometerCubit -> CentimeterCubit -> MillimeterCubit -> MicrometerCubit -> NanometerCubit -> AngstromCubit -> MileCubit -> YardCubit -> FootCubit -> InchCubit -> Nautical MileCubit -> FathomCubit -> FurlongCubit -> ChainCubit -> RodCubit -> LeagueCubit -> Light YearCubit -> ParsecCubit -> Astronomical UnitCubit -> Mil/ThouCubit -> MicroinchCubit -> PicometerCubit -> FermiCubit -> HandCubit -> SpanCubit -> Link (Gunter)Cubit -> DecimeterCubit -> DekameterCubit -> HectometerHand -> MeterHand -> KilometerHand -> CentimeterHand -> MillimeterHand -> MicrometerHand -> NanometerHand -> AngstromHand -> MileHand -> YardHand -> FootHand -> InchHand -> Nautical MileHand -> FathomHand -> FurlongHand -> ChainHand -> RodHand -> LeagueHand -> Light YearHand -> ParsecHand -> Astronomical UnitHand -> Mil/ThouHand -> MicroinchHand -> PicometerHand -> FermiHand -> CubitHand -> SpanHand -> Link (Gunter)Hand -> DecimeterHand -> DekameterHand -> HectometerSpan -> MeterSpan -> KilometerSpan -> CentimeterSpan -> MillimeterSpan -> MicrometerSpan -> NanometerSpan -> AngstromSpan -> MileSpan -> YardSpan -> FootSpan -> InchSpan -> Nautical MileSpan -> FathomSpan -> FurlongSpan -> ChainSpan -> RodSpan -> LeagueSpan -> Light YearSpan -> ParsecSpan -> Astronomical UnitSpan -> Mil/ThouSpan -> MicroinchSpan -> PicometerSpan -> FermiSpan -> CubitSpan -> HandSpan -> Link (Gunter)Span -> DecimeterSpan -> DekameterSpan -> HectometerLink (Gunter) -> MeterLink (Gunter) -> KilometerLink (Gunter) -> CentimeterLink (Gunter) -> MillimeterLink (Gunter) -> MicrometerLink (Gunter) -> NanometerLink (Gunter) -> AngstromLink (Gunter) -> MileLink (Gunter) -> YardLink (Gunter) -> FootLink (Gunter) -> InchLink (Gunter) -> Nautical MileLink (Gunter) -> FathomLink (Gunter) -> FurlongLink (Gunter) -> ChainLink (Gunter) -> RodLink (Gunter) -> LeagueLink (Gunter) -> Light YearLink (Gunter) -> ParsecLink (Gunter) -> Astronomical UnitLink (Gunter) -> Mil/ThouLink (Gunter) -> MicroinchLink (Gunter) -> PicometerLink (Gunter) -> FermiLink (Gunter) -> CubitLink (Gunter) -> HandLink (Gunter) -> SpanLink (Gunter) -> DecimeterLink (Gunter) -> DekameterLink (Gunter) -> HectometerDecimeter -> MeterDecimeter -> KilometerDecimeter -> CentimeterDecimeter -> MillimeterDecimeter -> MicrometerDecimeter -> NanometerDecimeter -> AngstromDecimeter -> MileDecimeter -> YardDecimeter -> FootDecimeter -> InchDecimeter -> Nautical MileDecimeter -> FathomDecimeter -> FurlongDecimeter -> ChainDecimeter -> RodDecimeter -> LeagueDecimeter -> Light YearDecimeter -> ParsecDecimeter -> Astronomical UnitDecimeter -> Mil/ThouDecimeter -> MicroinchDecimeter -> PicometerDecimeter -> FermiDecimeter -> CubitDecimeter -> HandDecimeter -> SpanDecimeter -> Link (Gunter)Decimeter -> DekameterDecimeter -> HectometerDekameter -> MeterDekameter -> KilometerDekameter -> CentimeterDekameter -> MillimeterDekameter -> MicrometerDekameter -> NanometerDekameter -> AngstromDekameter -> MileDekameter -> YardDekameter -> FootDekameter -> InchDekameter -> Nautical MileDekameter -> FathomDekameter -> FurlongDekameter -> ChainDekameter -> RodDekameter -> LeagueDekameter -> Light YearDekameter -> ParsecDekameter -> Astronomical UnitDekameter -> Mil/ThouDekameter -> MicroinchDekameter -> PicometerDekameter -> FermiDekameter -> CubitDekameter -> HandDekameter -> SpanDekameter -> Link (Gunter)Dekameter -> DecimeterDekameter -> HectometerHectometer -> MeterHectometer -> KilometerHectometer -> CentimeterHectometer -> MillimeterHectometer -> MicrometerHectometer -> NanometerHectometer -> AngstromHectometer -> MileHectometer -> YardHectometer -> FootHectometer -> InchHectometer -> Nautical MileHectometer -> FathomHectometer -> FurlongHectometer -> ChainHectometer -> RodHectometer -> LeagueHectometer -> Light YearHectometer -> ParsecHectometer -> Astronomical UnitHectometer -> Mil/ThouHectometer -> MicroinchHectometer -> PicometerHectometer -> FermiHectometer -> CubitHectometer -> HandHectometer -> SpanHectometer -> Link (Gunter)Hectometer -> DecimeterHectometer -> Dekameter
About length units
This category covers 31 length units and every ordered conversion between them, which is 930 dedicated pages in total. The units included here are Meter (m), Kilometer (km), Centimeter (cm), Millimeter (mm), Micrometer (µm), Nanometer (nm), Angstrom (Å), Mile (mi), Yard (yd), Foot (ft), Inch (in), Nautical Mile (nmi), Fathom (ftm), Furlong (fur), Chain (ch), Rod (rd), League (lea), Light Year (ly), Parsec (pc), Astronomical Unit (AU), Mil/Thou (mil), Microinch (µin), Picometer (pm), Fermi (fm), Cubit (cubit), Hand (hand), Span (span), Link (Gunter) (li), Decimeter (dm), Dekameter (dam), Hectometer (hm). Each unit is defined against a single canonical reference for the category, so a conversion between any two of them is carried out as two exact steps: the input value is first expressed in the reference unit, then re-expressed in the target unit. Routing every pair through one reference rather than storing a factor for each combination keeps the whole category internally consistent and means a correction to one definition propagates everywhere it is used.
Precision and rounding
Conversions are computed in double-precision floating point and displayed at the precision you choose, so the value shown is a rounded view of a more exact internal result rather than the result itself. Where a factor is defined exactly by treaty or standard, the arithmetic is exact to the limits of the representation; where a factor derives from a measured physical quantity, the trailing digits carry the uncertainty of the underlying measurement. For engineering and scientific work, carry the full precision through intermediate steps and round only the final figure, since rounding at each stage of a multi-step calculation accumulates error.
How to use this page
Pick any pair above to open its dedicated converter, which shows the formula, the exact factor, a table of common values and the source the definition is taken from. The search box filters the pair list by unit name or symbol, which is the quickest route when a category carries many closely named units. Every conversion is calculated in your browser, so pages continue to work offline once visited and no input value is ever sent to a server.