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

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

Value
Unit
Decimals

#

Watts#

UnitSymbolSymbol
(plain text)
ValueNotes
milliwattShow sourcemWmWmW1000Equivalent to one millionth of watts (0.000001 W). See the watt unit for more information.1 mW=106 W1\ mW = 10^{-6}\ W
watShow sourceWWW1Basic power unit in the SI system. One watt corresponds to one joule work performed in one second. 1 W=Js1\ W = \frac{J}{s}
joule per secondShow sourceJs\frac{J}{s}J/s1Equivalent to one watt. See the wat unit for more information.
kilowattShow sourcekWkWkW0.001Equivalent 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\ W
megawattShow sourceMWMWMW0.000001Equivalent to one million watts (1,000,000 W). A unit often used in the power industry.1 MW=1000 000 W1\ MW = 1000\ 000\ W
gigawattShow sourceGWGWGW1×10-9Equivalent 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\ W

Horse powers#

UnitSymbolSymbol
(plain text)
ValueNotes
horsepower metricShow sourcehp(M)hp(M)hp(M)0.001359622A 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}
horsepower imperialShow sourcehp(I)hp(I)hp(I)0.001341022A 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}
horsepower eletricalShow sourcehp(E)hp(E)hp(E)0.001340483Power 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\ W
horsepower boilerShow sourcehp(S)hp(S)hp(S)0.000101942Historic 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.
PferdestärkeShow sourcepspsps0.001359622Alternative 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)

Gravitational#

UnitSymbolSymbol
(plain text)
ValueNotes
foot-pound-force per hourShow sourceft×lbfh\frac{ft \times lbf}{h}ft·lbf / h2655.2237374Power 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.
foot-pound-force per minuteShow sourceft×lbfmin\frac{ft \times lbf}{min}ft·lbf / min44.253728957Power 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}
foot-pound-force per secondShow sourceft×lbfs\frac{ft \times lbf}{s}ft·lbf / s0.737562149Power 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}

Pressure related#

UnitSymbolSymbol
(plain text)
ValueNotes
atmosphere cubic foot per hourShow sourceatm×ft3h\frac{atm \times ft^3}{h}atm·cfh1.254703185Equivalent power needed to compress gas with volume of one cubic foot to pressure of one atmosphere in one hour.
atmosphere cubic foot per minuteShow sourceatm×ft3min\frac{atm \times ft^3}{min}atm·cfm0.02091172Equivalent 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}
atmosphere cubic foot per secondShow sourceatm×ft3s\frac{atm \times ft^3}{s}atm·cfs0.000348529Equivalent 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}
atmosphere cubic centimetre per hourShow sourceatm×cm3h\frac{atm \times cm^3}{h}atm·cch35529.2376018Equivalent power needed to compress gas with volume of one cubic centimeter to pressure of one atmosphere in one hour.
atmosphere cubic centimetre per minuteShow sourceatm×cm3min\frac{atm \times cm^3}{min}atm·ccm592.15396003Equivalent 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}
atmosphere cubic centimetre per secondShow sourceatm×cm3s\frac{atm \times cm^3}{s}atm·ccs9.869232667Equivalent 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}
litre-atmosphere per hourShow sourcel×atmh\frac{l \times atm}{h}l·atm/h35.529237602Equivalent power needed to compress gas with volume of one litre to pressure of one atmosphere in one hour.
litre-atmosphere per minuteShow sourcel×atmmin\frac{l \times atm}{min}l·atm/min0.59215396Equivalent 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}
litre-atmosphere per secondShow sourcel×atms\frac{l \times atm}{s}l·atm/s0.009869233Equivalent 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}
lusecShow sourcel×μmHgs\frac{l \times \mu mHg}{s}L·µmHg/s7500.001875Power 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}

Heat transfer#

UnitSymbolSymbol
(plain text)
ValueNotes
BTUIT per hourShow sourceBTUITh\frac{BTU_{IT}}{h}BTUIT/h3.412141633Equivalent to heat flow at the speed of one British thermal unit (1 BTU) per hour (60 min).
BTUIT per minuteShow sourceBTUITmin\frac{BTU_{IT}}{min}BTUIT/min0.056869027Equivalent 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}
BTUIT per secondShow sourceBTUITs\frac{BTU_{IT}}{s}BTUIT/s0.000947817Equivalent 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}
calorie (International Table) per hourShow sourcecalITh\frac{cal_{IT}}{h}calIT/h859.845227859Equivalent to heat flow at the speed of one calorie (1 cal) per hour (60 min).
calorie (International Table) per minuteShow sourcecalITmin\frac{cal_{IT}}{min}calIT/min14.330753798Equivalent 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}
calorie (International Table) per secondShow sourcecalITs\frac{cal_{IT}}{s}calIT/s0.238845897Equivalent 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}

Heating and air conditioning#

UnitSymbolSymbol
(plain text)
ValueNotes
square foot equivalent direct radiationShow sourcesq ft EDR\text{sq ft EDR}sq ft EDR0.014217257A 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\ W
ton of air conditioningShow sourceton AC\text{ton AC}ton AC0.001184553A 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\ kW
ton of refrigeration (IT)Show sourceTRTRTR0.000284345A 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 \ kW
ton of refrigeration (Imperial)Show sourceTRUKTR_{UK}TR (UK)0.00025388An 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 \ kW

Other#

UnitSymbolSymbol
(plain text)
ValueNotes
ponceletShow sourceppp0.001019716Historic 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}

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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