Power units converter
Power units converter. This calculator converts between horsepower, wats and over a dozen other power units.

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Inputs data - value and unit, which we're going to convert#

Value
Unit
Decimals

11 (wat) is equal to:#

Watts#

UnitSymbolSymbol
(plain text)
Value as symbolicValue as numericNotesUnit conversion formula
milliwattShow sourcemWmWmWShow source...\text{...}-Equivalent to one millionth of watts (0.000001 W). See the watt unit for more information.1 mW=106 W1\ mW = 10^{-6}\ WShow source......
watShow sourceWWWShow source...\text{...}-Basic power unit in the SI system. One watt corresponds to one joule work performed in one second. 1 W=Js1\ W = \frac{J}{s}Show source......
joule per secondShow sourceJs\frac{J}{s}J/sShow source...\text{...}-Equivalent to one watt. See the wat unit for more information.Show source......
kilowattShow sourcekWkWkWShow source...\text{...}-Equivalent to one thousand watts (1000 W). A unit used, among others, to measure the power of motors (next to horsepower) or in stage electroacoustics. See the watt unit for more information.1 kW=1000 W1\ kW = 1000\ WShow source......
megawattShow sourceMWMWMWShow source...\text{...}-Equivalent to one million watts (1,000,000 W). A unit often used in the power industry.1 MW=1000 000 W1\ MW = 1000\ 000\ WShow source......
gigawattShow sourceGWGWGWShow source...\text{...}-Equivalent to one billion watts (1,000,000,000 W). A unit used among others in the power industry. See the watt unit for more information.1 GW=109 W1\ GW = 10^9\ WShow source......

Horse powers#

UnitSymbolSymbol
(plain text)
Value as symbolicValue as numericNotesUnit conversion formula
horsepower metricShow sourcehp(M)hp(M)hp(M)Show source...\text{...}-A unit of power came from meter-kilogram-second system (MKS). Although the MKS system was replaced by SI units horsepower is still often used to determine the power of internal combustion engines. Historically, one horsepower corresponded to an eight-hour work shift (1/3 day) of one live horse. One horsepower corresponds to fifty-five kilograms per second (75 kgf m/s). 1 hp(M)=75 kgfms1\ hp(M) = 75\ \frac {kgf \cdot m}{s}Show source......
horsepower imperialShow sourcehp(I)hp(I)hp(I)Show source...\text{...}-A power unit used in Anglo-Saxon countries. One British horsepower corresponds to the power required to pick up five hundred and fifty pounds (550 lb) at one foot height (1 ft) within one second (1 s). See the horsepower unit for more information. 1 hp(I)=550 lbffts1 \ hp(I) = 550\ \frac{lbf \cdot ft}{s}Show source......
horsepower eletricalShow sourcehp(E)hp(E)hp(E)Show source...\text{...}-Power unit used for electric motor rating. One electric horse corresponds to seven hundred and forty-six watts (746 W).See the wat unit for more information.1 hp(E)=746 W1\ hp(E) = 746\ WShow source......
horsepower boilerShow sourcehp(S)hp(S)hp(S)Show source...\text{...}-Historic power unit initially used to determine the power of steam engines. One boiler horse corresponds to heat flux required to steam thirty-four and a half pounds of water (34.5 lb) at temperature 212°F within one hour. See the horsepower unit for more information.Show source......
PferdestärkeShow sourcepspspsShow source...\text{...}-Alternative name of metric horsepower (1 hp(M)) came from Germany. See the metric horsepower unit for more information.1 ps=1 hp(M)1\ ps = 1\ hp(M)Show source......

Gravitational#

UnitSymbolSymbol
(plain text)
Value as symbolicValue as numericNotesUnit conversion formula
foot-pound-force per hourShow sourceft×lbfh\frac{ft \times lbf}{h}ft·lbf / hShow source...\text{...}-Power unit used in Anglo-Saxon countries. One foot-pound-force per hour corresponds to the power needed to raise a mass of one pound to height of one foot within one hour.Show source......
foot-pound-force per minuteShow sourceft×lbfmin\frac{ft \times lbf}{min}ft·lbf / minShow source...\text{...}-Power unit used in Anglo-Saxon countries. One foot-pound-force per minute corresponds to the power needed to raise a mass of one pound to height of one foot within one minute.1 ft×lbfmin=ft×lbf1/60 h=60 ft×lbfh1\ \frac{ft \times lbf}{min} = \frac{ft \times lbf}{1/60\ h} = 60\ \frac{ft \times lbf}{h}Show source......
foot-pound-force per secondShow sourceft×lbfs\frac{ft \times lbf}{s}ft·lbf / sShow source...\text{...}-Power unit used in Anglo-Saxon countries. One foot-pound-force per second corresponds to the power needed to raise a mass of one pound to height of one foot within one second.1 ft×lbfs=ft×lbf1/3600 h=3600 ft×lbfh1\ \frac{ft \times lbf}{s} = \frac{ft \times lbf}{1/3600\ h} = 3600\ \frac{ft \times lbf}{h}Show source......

Pressure related#

UnitSymbolSymbol
(plain text)
Value as symbolicValue as numericNotesUnit conversion formula
atmosphere cubic foot per hourShow sourceatm×ft3h\frac{atm \times ft^3}{h}atm·cfhShow source...\text{...}-Equivalent power needed to compress gas with volume of one cubic foot to pressure of one atmosphere in one hour.Show source......
atmosphere cubic foot per minuteShow sourceatm×ft3min\frac{atm \times ft^3}{min}atm·cfmShow source...\text{...}-Equivalent power needed to compress gas with volume of one cubic foot to pressure of one atmosphere in one minute.1 atm×ft3min=atm×ft31/60 h=60 atm×ft3h1\ \frac{atm \times ft^3}{min} = \frac{atm \times ft^3}{1/60\ h} = 60\ \frac{atm \times ft^3}{h}Show source......
atmosphere cubic foot per secondShow sourceatm×ft3s\frac{atm \times ft^3}{s}atm·cfsShow source...\text{...}-Equivalent power needed to compress gas with volume of one cubic foot to pressure of one atmosphere in one second.1 atm×ft3s=atm×ft31/3600 h=3600 atm×ft3h1\ \frac{atm \times ft^3}{s} = \frac{atm \times ft^3}{1/3600\ h} = 3600\ \frac{atm \times ft^3}{h}Show source......
atmosphere cubic centimetre per hourShow sourceatm×cm3h\frac{atm \times cm^3}{h}atm·cchShow source...\text{...}-Equivalent power needed to compress gas with volume of one cubic centimeter to pressure of one atmosphere in one hour.Show source......
atmosphere cubic centimetre per minuteShow sourceatm×cm3min\frac{atm \times cm^3}{min}atm·ccmShow source...\text{...}-Equivalent power needed to compress gas with volume of one cubic centimeter to pressure of one atmosphere in one minute.1 atm×cm3min=atm×cm31/60 h=60 atm×cm3h1\ \frac{atm \times cm^3}{min} = \frac{atm \times cm^3}{1/60\ h} = 60\ \frac{atm \times cm^3}{h}Show source......
atmosphere cubic centimetre per secondShow sourceatm×cm3s\frac{atm \times cm^3}{s}atm·ccsShow source...\text{...}-Equivalent power needed to compress gas with volume of one cubic centimeter to pressure of one atmosphere in one second.1 atm×cm3s=atm×cm31/3600 h=3600 atm×cm3h1\ \frac{atm \times cm^3}{s} = \frac{atm \times cm^3}{1/3600\ h} = 3600\ \frac{atm \times cm^3}{h}Show source......
litre-atmosphere per hourShow sourcel×atmh\frac{l \times atm}{h}l·atm/hShow source...\text{...}-Equivalent power needed to compress gas with volume of one litre to pressure of one atmosphere in one hour.Show source......
litre-atmosphere per minuteShow sourcel×atmmin\frac{l \times atm}{min}l·atm/minShow source...\text{...}-Equivalent power needed to compress gas with volume of one litre to pressure of one atmosphere in one minute.1 l×atmmin=l×atm1/60 h=60 l×atmh1\ \frac{l \times atm}{min} = \frac{l \times atm}{1/60\ h} = 60\ \frac{l \times atm}{h}Show source......
litre-atmosphere per secondShow sourcel×atms\frac{l \times atm}{s}l·atm/sShow source...\text{...}-Equivalent power needed to compress gas with volume of one litre to pressure of one atmosphere in one second.1 l×atms=l×atm1/3600 h=3600 l×atmh1\ \frac{l \times atm}{s} = \frac{l \times atm}{1/3600\ h} = 3600\ \frac{l \times atm}{h}Show source......
lusecShow sourcel×μmHgs\frac{l \times \mu mHg}{s}L·µmHg/sShow source...\text{...}-Power unit used to measure the performance of the vacuum pump. One lusec corresponds to the flow of one litre (1 l) per second (1 s) at the pressure of one millitor (1 mtorr).1 lusec=1 l×mtorrs=1 l×μmHgs1\ lusec = \frac{1\ l \times mtorr}{s} = \frac{1\ l \times \mu mHg}{s}Show source......

Heat transfer#

UnitSymbolSymbol
(plain text)
Value as symbolicValue as numericNotesUnit conversion formula
BTUIT per hourShow sourceBTUITh\frac{BTU_{IT}}{h}BTUIT/hShow source...\text{...}-Equivalent to heat flow at the speed of one British thermal unit (1 BTU) per hour (60 min).Show source......
BTUIT per minuteShow sourceBTUITmin\frac{BTU_{IT}}{min}BTUIT/minShow source...\text{...}-Equivalent to heat flow at the speed of one British thermal unit (1 BTU) per minute (60 s).1 BTUITmin=BTUIT1/60 h=60 BTUITh1\ \frac{BTU_{IT}}{min} = \frac{BTU_{IT}}{1/60\ h} = 60\ \frac{BTU_{IT}}{h}Show source......
BTUIT per secondShow sourceBTUITs\frac{BTU_{IT}}{s}BTUIT/sShow source...\text{...}-Equivalent to heat flow at the speed of one British thermal unit (1 BTU) per second (1 s).1 BTUITs=BTUIT1/3600 h=3600 BTUITh1\ \frac{BTU_{IT}}{s} = \frac{BTU_{IT}}{1/3600\ h} = 3600\ \frac{BTU_{IT}}{h}Show source......
calorie (International Table) per hourShow sourcecalITh\frac{cal_{IT}}{h}calIT/hShow source...\text{...}-Equivalent to heat flow at the speed of one calorie (1 cal) per hour (60 min).Show source......
calorie (International Table) per minuteShow sourcecalITmin\frac{cal_{IT}}{min}calIT/minShow source...\text{...}-Equivalent to heat flow at the speed of one calorie (1 cal) per minute (60 s).1 calmin=cal1/60 h=60 calh1\ \frac{cal}{min} = \frac{cal}{1/60\ h} = 60\ \frac{cal}{h}Show source......
calorie (International Table) per secondShow sourcecalITs\frac{cal_{IT}}{s}calIT/sShow source...\text{...}-Equivalent to heat flow at the speed of one calorie (1 cal) per second (1 s).1 cals=cal1/3600 h=3600 calh1\ \frac{cal}{s} = \frac{cal}{1/3600\ h} = 3600\ \frac{cal}{h}Show source......

Heating and air conditioning#

UnitSymbolSymbol
(plain text)
Value as symbolicValue as numericNotesUnit conversion formula
square foot equivalent direct radiationShow sourcesq ft EDR\text{sq ft EDR}sq ft EDRShow source...\text{...}-A power unit used to measure the performance of radiators and heat sinks. Historically, one square foot EDR (equivalent direct radiation) corresponded to the power given by the radiator by area of one square foot (1 sq ft ).1 sq ft EDR=240 BTUITh70.337057 W1\ sq\ ft\ EDR = 240\ \frac{BTU_{IT}}{h} \approx 70.337057\ WShow source......
ton of air conditioningShow sourceton AC\text{ton AC}ton ACShow source...\text{...}-A power unit used to measure air conditioning performance. One ton of ice conditioning (1 TR) corresponds to the heat flow required to melt one ton of pure ice at temperature 0°C within one day (24 h).1 ton AC12000 BTUITh3.5 kW1\ ton\ AC \approx 12000\ \frac{BTU_{IT}}{h} \approx 3.5\ kWShow source......
ton of refrigeration (IT)Show sourceTRTRTRShow source...\text{...}-A power unit used in the United States to measure performance of air conditioning. One ton of refrigeration (1 TR) corresponds to the heat flow required to melt one short ton (1 sh ton) of pure ice at temperature 0°C within one day (24 h).1 TR=1 BTUIT×1 sh tonlb×10 mins3.516853 kW1\ TR = 1\ BTU_{IT} \times 1\ \frac{sh\ ton}{lb} \times 10\ \frac{min}{s} \approx 3.516853 \ kWShow source......
ton of refrigeration (Imperial)Show sourceTRUKTR_{UK}TR (UK)Show source...\text{...}-An imperial power unit used to measure the performance of air conditioning. One imperial ton of refrigeration (1 TR) corresponds to the heat flow required to melt one long ton (1 lng ton) of pure ice at temperature 0°C within one day (24 h). See mass unit long ton to learn more.1 TR=1 BTUIT×1 lng tonlb×10 mins3.938875 kW1\ TR = 1\ BTU_{IT} \times 1\ \frac{lng\ ton}{lb} \times 10\ \frac{min}{s} \approx 3.938 875 \ kWShow source......

Other#

UnitSymbolSymbol
(plain text)
Value as symbolicValue as numericNotesUnit conversion formula
ponceletShow sourcepppShow source...\text{...}-Historic power unit used in France. One poncelet corresponded to the power needed to give a mass of one hundred kilograms (100 kg) the velocity of one meter per second (1 m/s).1 p=100 kgf×ms1\ p = \frac{100\ kgf \times m}{s}Show source......

Some facts#

  • Power determines the work done by a physical system in given time unit.
  • Power is a scalar. It means that it has no direction.
  • Basic power unit in SI system is one watt (1 W). Power has value of one watt (1 J), when system done work of one joule (1 J) in time of one second (1 s):
    1W=1J/1s1W = 1J/1s
  • The instantaneous power is defined as a derivative of work:
    P=dWdtP = \dfrac{dW}{dt}
  • To calculate the average power over a period of time [t0,t1][t_0, t_1], we need to compute integral:
    Pavg.=1t1t0×t0t1P(t)dtP_{avg.} = \dfrac{1}{t_1 - t_0} \times \int\limits_{t_0}^{t_1} P(t) dt
  • If work is constant (time independent), we can compute average power in simpler way using formula:
    Pavg.=WtP_{avg.}=\dfrac{W}{t}
    where:
    • W - amount of work done,
    • t - time.
  • Despite the widespread of the SI system, traditional power units are still used in selected fields, e.g.:
    • engine power is traditionally measured in horsepowers, depending on the region these are metric horsepowers (called Pferdestärke in Germany, abbreviated 1 ps) based on metric units (kilograms and meters) or imperial horsepowers based on imperial units (pounds and feet),
    • radiator power and radiator efficiency sometimes traditionally given as the equivalent of direct square foot radiation (1 EPR) ,
    • air conditioning performance is traditionally measured in the so-called tonnes of ice (ton AC),
    • the efficiency of a vacuum pump is traditionally given in lusecs (1 lusec),
    • etc.
  • The power consumed by the electric device can be calculated using the formula:
    P=U×IP = U \times I
    where:
    This property is used, e.g. by popular power meters available on the market, which measure the electric power consumed by the device.
  • In alternative way, power can be understood as speed of energy emission.
  • If certain electric device charge e.g. 60W of power, then the same amount of power is emitted to the outside. This follows from the principle of conservation of energy. Almost all energy consumed by electrical devices is emitted as heat. This problem has become particularly noticeable with the rapid development of computers. In the early 90s processors found in personal computers do not required special cooling. Beggining from 586 (Pentium), the CPU fan has become an integral part of any personal computer.

How to convert#

  • Enter the number to field "value" - enter the NUMBER only, no other words, symbols or unit names. You can use dot (.) or comma (,) to enter fractions.
    Examples:
    • 1000000
    • 123,23
    • 999.99999
  • Find and select your starting unit in field "unit". Some unit calculators have huge number of different units to select from - it's just how complicated our world is...
  • And... you got the result in the table below. You'll find several results for many different units - we show you all results we know at once. Just find the one you're looking for.

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