Directe omzettingen

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Omrekenen

Common direct conversions

Inch to Centimetrein → cmLengte Centimetre to Inchcm → inLengte Foot to Metreft → mLengte Metre to Footm → ftLengte Mile to Kilometremi → kmLengte Kilometre to Milekm → miLengte Nautical mile to Kilometrenmi → kmLengte Hectare to Square metreha → m²Oppervlakte Square metre to Hectarem² → haOppervlakte Acre to Square metreacre → m²Oppervlakte Litre to US gallonl → galVolume US gallon to Litregal → lVolume Millilitre to Cupml → cupVolume Cup to Millilitrecup → mlVolume Pound to Kilogramlb → kgMassa Kilogram to Poundkg → lbMassa

Lengte

Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.

Tabel

Basiseenheidm

Doelwaarden7

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Oppervlakte

Area scales quadratically. A length factor is not automatically an area factor.

Tabel

Basiseenheidm²

Doelwaarden3

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Hectare to Square metreha → m²Oppervlakte Square metre to Hectarem² → haOppervlakte Acre to Square metreacre → m²Oppervlakte

Volume

Volume is robust for liquids. For dry ingredients it does not replace weighing because density and packing vary.

Tabel

Basiseenheidl

Doelwaarden4

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Litre to US gallonl → galVolume US gallon to Litregal → lVolume Millilitre to Cupml → cupVolume Cup to Millilitrecup → mlVolume

Massa

Pound is not always the same local unit. UnitCloud uses international avoirdupois values.

Tabel

Basiseenheidg

Doelwaarden4

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Pound to Kilogramlb → kgMassa Kilogram to Poundkg → lbMassa Ounce to Gramoz → gMassa Gram to Ounceg → ozMassa

Temperatuur

Temperature uses an offset. Fahrenheit and Kelvin are not pure factor units.

Tabel

Basiseenheid°C

Doelwaarden4

BronnenBIPM SI Brochure · NIST Metric SI · NIST Guide to SI Appendix B

Fahrenheit to Celsius°F → °CTemperatuur Celsius to Fahrenheit°C → °FTemperatuur Kelvin to CelsiusK → °CTemperatuur Celsius to Kelvin°C → KTemperatuur

Data

KB, MB and GB are decimal. KiB, MiB and GiB are binary. This distinction explains many apparent storage gaps.

Tabel

BasiseenheidByte

Doelwaarden6

BronnenNIST Metric SI Prefixes · NIST Binary Prefixes

Gigabyte to GibibyteGB → GiBData Gibibyte to GigabyteGiB → GBData Mebibyte to MegabyteMiB → MBData Megabyte to MebibyteMB → MiBData Bit to Bytebit → BData Terabyte to TebibyteTB → TiBData

Snelheid

Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.

Tabel

Basiseenheidm/s

Doelwaarden5

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Knot to Kilometres per hourkn → km/hSnelheid Kilometres per hour to Knotkm/h → knSnelheid Miles per hour to Kilometres per hourmph → km/hSnelheid Kilometres per hour to Miles per hourkm/h → mphSnelheid Metres per second to Kilometres per hourm/s → km/hSnelheid

Energie

Food calories are kilocalories. Utility bills use kilowatt-hours. Both are energy units, but in different contexts.

Tabel

BasiseenheidJ

Doelwaarden5

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Kilowatt-hour to JoulekWh → JEnergie Joule to Kilowatt-hourJ → kWhEnergie Kilocalorie to Kilojoulekcal → kJEnergie Kilojoule to KilocaloriekJ → kcalEnergie British thermal unit to Kilowatt-hourBTU → kWhEnergie

Vermogen

PS and hp are not identical. Vehicle data often uses metric horsepower, while US/UK contexts often use mechanical horsepower.

Tabel

BasiseenheidW

Doelwaarden4

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Kilowatt to Metric horsepowerkW → PSVermogen Metric horsepower to KilowattPS → kWVermogen Kilowatt to Mechanical horsepowerkW → hpVermogen Watt to BTU per hourW → BTU/hVermogen

Druk

bar, psi and atm appear in different fields. Tyre, weather and lab values need context.

Tabel

BasiseenheidPa

Doelwaarden4

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B.8

bar to psibar → psiDruk psi to barpsi → barDruk Kilopascal to psikPa → psiDruk Atmosphere to baratm → barDruk

Dichtheid

Density depends on temperature, material state and measurement conditions. Unit conversion does not replace material data.

Tabel

Basiseenheidkg/m³

Doelwaarden2

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Gram per cubic centimetre to Kilogram per cubic metreg/cm³ → kg/m³Dichtheid Kilogram per cubic metre to Gram per cubic centimetrekg/m³ → g/cm³Dichtheid

Tijd

Calendar months and years vary. This family uses fixed seconds for technical durations, not legal deadlines.

Tabel

Basiseenheids

Doelwaarden3

BronnenBIPM SI Brochure · NIST Metric SI

Hour to Secondh → sTijd Day to Hourd → hTijd Week to Dayweek → dTijd

Hoek

Degrees and radians are often mixed in software, geometry and trigonometry. Formulas usually expect a specific angle unit.

Tabel

Basiseenheidrad

Doelwaarden2

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Degree to Radian° → radHoek Radian to Degreerad → °Hoek

Kracht

Force and mass are not the same. Kilogram is mass, newton is force.

Tabel

BasiseenheidN

Doelwaarden2

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B.8

Newton to Pound-forceN → lbfKracht Pound-force to Newtonlbf → NKracht

Koppel

Torque is not power. Newton metre and hp/kW answer different questions.

Tabel

BasiseenheidN·m

Doelwaarden2

BronnenBIPM SI Brochure · NIST Guide to SI Appendix B

Newton metre to Pound-footN·m → lb·ftKoppel Pound-foot to Newton metrelb·ft → N·mKoppel

Verbruik

mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.

Tabel

Basiseenheidl/100 km

Doelwaarden3

BronnenNIST Guide to SI Appendix B

Miles per US gallon to Litres per 100 kilometresmpg US → l/100 kmVerbruik Litres per 100 kilometres to Miles per US gallonl/100 km → mpg USVerbruik Kilometres per litre to Litres per 100 kilometreskm/l → l/100 kmVerbruik

Typografie

px depends on output context. UnitCloud uses the CSS reference of 96 px per inch.

Tabel

Basiseenheidpt

Doelwaarden3

BronnenNIST Guide to SI Appendix B · W3C CSS Values and Units

Point to CSS pixelpt → pxTypografie CSS pixel to Pointpx → ptTypografie Millimetre to Pointmm → ptTypografie

Beeldresolutie

Pixel count and print density are different. Print sizes also need width, height and ppi.

Tabel

Basiseenheidpx

Doelwaarden2

BronnenNIST Metric SI Prefixes

Megapixel to PixelMP → pxBeeldresolutie Pixel to Megapixelpx → MPBeeldresolutie

Frequentie

rpm and bpm are events per minute. Hz is events per second.

Tabel

BasiseenheidHz

Doelwaarden3

BronnenBIPM SI Brochure · NIST Metric SI

Hertz to Revolutions per minuteHz → rpmFrequentie Revolutions per minute to Hertzrpm → HzFrequentie Megahertz to GigahertzMHz → GHzFrequentie