直接转换 | UnitCloud

直接转换

UnitCloud 是面向日常、工程、IT、能源、交通和设计的本地测量实验室。

转换

Common direct conversions

Inch to Centimetrein → cm长度 Centimetre to Inchcm → in长度 Foot to Metreft → m长度 Metre to Footm → ft长度 Mile to Kilometremi → km长度 Kilometre to Milekm → mi长度 Nautical mile to Kilometrenmi → km长度 Hectare to Square metreha → m²面积 Square metre to Hectarem² → ha面积 Acre to Square metreacre → m²面积 Litre to US gallonl → gal体积 US gallon to Litregal → l体积 Millilitre to Cupml → cup体积 Cup to Millilitrecup → ml体积 Pound to Kilogramlb → kg质量 Kilogram to Poundkg → lb质量

长度

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

表格

基准单位m

目标值7

来源BIPM SI Brochure · NIST Guide to SI Appendix B

面积

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

表格

基准单位m²

目标值3

来源BIPM SI Brochure · NIST Guide to SI Appendix B

Hectare to Square metreha → m²面积 Square metre to Hectarem² → ha面积 Acre to Square metreacre → m²面积

体积

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

表格

基准单位l

目标值4

来源BIPM SI Brochure · NIST Guide to SI Appendix B

Litre to US gallonl → gal体积 US gallon to Litregal → l体积 Millilitre to Cupml → cup体积 Cup to Millilitrecup → ml体积

质量

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

表格

基准单位g

目标值4

来源BIPM SI Brochure · NIST Guide to SI Appendix B

Pound to Kilogramlb → kg质量 Kilogram to Poundkg → lb质量 Ounce to Gramoz → g质量 Gram to Ounceg → oz质量

温度

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

表格

基准单位°C

目标值4

来源BIPM SI Brochure · NIST Metric SI · NIST Guide to SI Appendix B

Fahrenheit to Celsius°F → °C温度 Celsius to Fahrenheit°C → °F温度 Kelvin to CelsiusK → °C温度 Celsius to Kelvin°C → K温度

数据

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

表格

基准单位Byte

目标值6

来源NIST Metric SI Prefixes · NIST Binary Prefixes

Gigabyte to GibibyteGB → GiB数据 Gibibyte to GigabyteGiB → GB数据 Mebibyte to MegabyteMiB → MB数据 Megabyte to MebibyteMB → MiB数据 Bit to Bytebit → B数据 Terabyte to TebibyteTB → TiB数据

速度

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

表格

基准单位m/s

目标值5

来源BIPM SI Brochure · NIST Guide to SI Appendix B

Knot to Kilometres per hourkn → km/h速度 Kilometres per hour to Knotkm/h → kn速度 Miles per hour to Kilometres per hourmph → km/h速度 Kilometres per hour to Miles per hourkm/h → mph速度 Metres per second to Kilometres per hourm/s → km/h速度

能量

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

表格

基准单位J

目标值5

来源BIPM SI Brochure · NIST Guide to SI Appendix B

Kilowatt-hour to JoulekWh → J能量 Joule to Kilowatt-hourJ → kWh能量 Kilocalorie to Kilojoulekcal → kJ能量 Kilojoule to KilocaloriekJ → kcal能量 British thermal unit to Kilowatt-hourBTU → kWh能量

功率

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

表格

基准单位W

目标值4

来源BIPM SI Brochure · NIST Guide to SI Appendix B

Kilowatt to Metric horsepowerkW → PS功率 Metric horsepower to KilowattPS → kW功率 Kilowatt to Mechanical horsepowerkW → hp功率 Watt to BTU per hourW → BTU/h功率

压力

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

表格

基准单位Pa

目标值4

来源BIPM SI Brochure · NIST Guide to SI Appendix B.8

bar to psibar → psi压力 psi to barpsi → bar压力 Kilopascal to psikPa → psi压力 Atmosphere to baratm → bar压力

密度

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

表格

基准单位kg/m³

目标值2

来源BIPM SI Brochure · NIST Guide to SI Appendix B

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

时间

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

表格

基准单位s

目标值3

来源BIPM SI Brochure · NIST Metric SI

Hour to Secondh → s时间 Day to Hourd → h时间 Week to Dayweek → d时间

角度

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

表格

基准单位rad

目标值2

来源BIPM SI Brochure · NIST Guide to SI Appendix B

Degree to Radian° → rad角度 Radian to Degreerad → °角度

力

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

表格

基准单位N

目标值2

来源BIPM SI Brochure · NIST Guide to SI Appendix B.8

Newton to Pound-forceN → lbf力 Pound-force to Newtonlbf → N力

扭矩

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

表格

基准单位N·m

目标值2

来源BIPM SI Brochure · NIST Guide to SI Appendix B

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

油耗

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

表格

基准单位l/100 km

目标值3

来源NIST Guide to SI Appendix B

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

排版

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

表格

基准单位pt

目标值3

来源NIST Guide to SI Appendix B · W3C CSS Values and Units

Point to CSS pixelpt → px排版 CSS pixel to Pointpx → pt排版 Millimetre to Pointmm → pt排版

图像分辨率

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

表格

基准单位px

目标值2

来源NIST Metric SI Prefixes

Megapixel to PixelMP → px图像分辨率 Pixel to Megapixelpx → MP图像分辨率

频率

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

表格

基准单位Hz

目标值3

来源BIPM SI Brochure · NIST Metric SI

Hertz to Revolutions per minuteHz → rpm频率 Revolutions per minute to Hertzrpm → Hz频率 Megahertz to GigahertzMHz → GHz频率