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

1 (wat) is equal to:


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joule per secondJs\frac{J}{s}J/s1

horse power

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metric horsepowerhp(M)hp(M)hp(M)0.001359622
mechanical horsepowerhp(I)hp(I)hp(I)0.001341022
eletrical horsepowerhp(E)hp(E)hp(E)0.001340483
boiler horsepowerhp(S)hp(S)hp(S)0.000101942


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foot-pound-force per hourft×lbfh\frac{ft \times lbf}{h}ft·lbf / h2655.2237374
foot-pound-force per minuteft×lbfmin\frac{ft \times lbf}{min}ft·lbf / min44.253728957
foot-pound-force per secondft×lbfs\frac{ft \times lbf}{s}ft·lbf / s0.737562149
atmosphere cubic foot per houratm×ft3h\frac{atm \times ft^3}{h}atm·cfh1.254703185
atmosphere cubic foot per minuteatm×ft3min\frac{atm \times ft^3}{min}atm·cfm0.02091172
atmosphere cubic foot per secondatm×ft3s\frac{atm \times ft^3}{s}atm·cfs0.000348529


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atmosphere cubic centimetre per houratm×cm3h\frac{atm \times cm^3}{h}atm·cch35529.2376018
atmosphere cubic centimetre per minuteatm×cm3min\frac{atm \times cm^3}{min}atm·ccm592.15396003
atmosphere cubic centimetre per secondatm×cm3s\frac{atm \times cm^3}{s}atm·ccs9.869232667
litre-atmosphere per hourl×atmh\frac{l \times atm}{h}l·atm/h35.529237602
litre-atmosphere per minutel×atmmin\frac{l \times atm}{min}l·atm/min0.59215396
litre-atmosphere per secondl×atms\frac{l \times atm}{s}l·atm/s0.009869233


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BTUIT per hourBTUITh\frac{BTU_{IT}}{h}BTUIT/h3.412141633
BTUIT per minuteBTUITmin\frac{BTU_{IT}}{min}BTUIT/min0.056869027
BTUIT per secondBTUITs\frac{BTU_{IT}}{s}BTUIT/s0.000947817


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calorie (International Table) per hourcalITh\frac{cal_{IT}}{h}calIT/h859.845227859
calorie (International Table) per minutecalITmin\frac{cal_{IT}}{min}calIT/min14.330753798
calorie (International Table) per secondcalITs\frac{cal_{IT}}{s}calIT/s0.238845897
lusecl×μmHgs\frac{l \times \mu mHg}{s}L·µmHg/s7500.001875
square foot equivalent direct radiationsq ft EDR\text{sq ft EDR}sq ft EDR0.014217257
ton of air conditionington AC\text{ton AC}ton AC0.001184553
ton of refrigeration (IT)TRTRTR0.000284345
ton of refrigeration (Imperial)TRUKTR_{UK}TR (UK)0.00025388

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 1W (one watt). Power has 1W value, when system done work 1 joule in time of 1 second:
    1W=1J/1s1W = 1J/1s
  • The instantaneous power is defined as a derivative of work:
    P=dWdtP = \frac{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.} = \frac{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:
    • W is work,
    • t is time.
  • The power consumed by the electric device can be calculated using the formula:
    P=U×IP = U \times I
    • U is the voltage,
    • I the intensity of the electric current.
    This property is used, eg. 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.
    • 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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