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

 milliwatt [mW]wat [W]joule per second [J/s]kilowatt [kW]megawatt [MW]gigawatt [GW]metric horsepower [hp(M)]mechanical horsepower [hp(I)]eletrical horsepower [hp(E)]boiler horsepower [hp(S)]foot-pound-force per hour [ft·lbf / h]foot-pound-force per minute [ft·lbf / min]foot-pound-force per second [ft·lbf / s]atmosphere cubic foot per hour [atm·cfh]atmosphere cubic foot per minute [atm·cfm]atmosphere cubic foot per second [atm·cfs]atmosphere cubic centimetre per hour [atm·cch]atmosphere cubic centimetre per minute [atm·ccm]atmosphere cubic centimetre per second [atm·ccs]litre-atmosphere per hour [l·atm/h]litre-atmosphere per minute [l·atm/min]litre-atmosphere per second [l·atm/s]poncelet [p]BTUIT per hour [BTUIT/h]BTUIT per minute [BTUIT/min]BTUIT per second [BTUIT/s]calorie (International Table) per hour [calIT/h]calorie (International Table) per minute [calIT/min]calorie (International Table) per second [calIT/s]lusec [L·µmHg/s]square foot equivalent direct radiation [sq ft EDR]ton of air conditioning [ton AC]ton of refrigeration (IT) [TR]ton of refrigeration (Imperial) [TR (UK)] 0123456789

# watt

 Unit Symbol Symbol(plain text) Value milliwatt $mW$ mW 1000 wat $W$ W 1 joule per second $\frac{J}{s}$ J/s 1 kilowatt $kW$ kW 0.001 megawatt $MW$ MW 0.000001 gigawatt $GW$ GW 1×10-9

# horse power

 Unit Symbol Symbol(plain text) Value metric horsepower $hp(M)$ hp(M) 0.001359622 mechanical horsepower $hp(I)$ hp(I) 0.001341022 eletrical horsepower $hp(E)$ hp(E) 0.001340483 boiler horsepower $hp(S)$ hp(S) 0.000101942

# foot

 Unit Symbol Symbol(plain text) Value foot-pound-force per hour $\frac{ft \times lbf}{h}$ ft·lbf / h 2655.2237374 foot-pound-force per minute $\frac{ft \times lbf}{min}$ ft·lbf / min 44.253728957 foot-pound-force per second $\frac{ft \times lbf}{s}$ ft·lbf / s 0.737562149 atmosphere cubic foot per hour $\frac{atm \times ft^3}{h}$ atm·cfh 1.254703185 atmosphere cubic foot per minute $\frac{atm \times ft^3}{min}$ atm·cfm 0.02091172 atmosphere cubic foot per second $\frac{atm \times ft^3}{s}$ atm·cfs 0.000348529

# metre

 Unit Symbol Symbol(plain text) Value atmosphere cubic centimetre per hour $\frac{atm \times cm^3}{h}$ atm·cch 35529.2376018 atmosphere cubic centimetre per minute $\frac{atm \times cm^3}{min}$ atm·ccm 592.15396003 atmosphere cubic centimetre per second $\frac{atm \times cm^3}{s}$ atm·ccs 9.869232667 litre-atmosphere per hour $\frac{l \times atm}{h}$ l·atm/h 35.529237602 litre-atmosphere per minute $\frac{l \times atm}{min}$ l·atm/min 0.59215396 litre-atmosphere per second $\frac{l \times atm}{s}$ l·atm/s 0.009869233 poncelet $p$ p 0.001019716

# BTU

 Unit Symbol Symbol(plain text) Value BTUIT per hour $\frac{BTU_{IT}}{h}$ BTUIT/h 3.412141633 BTUIT per minute $\frac{BTU_{IT}}{min}$ BTUIT/min 0.056869027 BTUIT per second $\frac{BTU_{IT}}{s}$ BTUIT/s 0.000947817

# other

 Unit Symbol Symbol(plain text) Value calorie (International Table) per hour $\frac{cal_{IT}}{h}$ calIT/h 859.845227859 calorie (International Table) per minute $\frac{cal_{IT}}{min}$ calIT/min 14.330753798 calorie (International Table) per second $\frac{cal_{IT}}{s}$ calIT/s 0.238845897 lusec $\frac{l \times \mu mHg}{s}$ L·µmHg/s 7500.001875 square foot equivalent direct radiation $\text{sq ft EDR}$ sq ft EDR 0.014217257 ton of air conditioning $\text{ton AC}$ ton AC 0.001184553 ton of refrigeration (IT) $TR$ TR 0.000284345 ton of refrigeration (Imperial) $TR_{UK}$ 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:
$1W = 1J/1s$
• The instantaneous power is defined as a derivative of work:
$P = \frac{dW}{dt}$
• To calculate the average power over a period of time $[t_0, t_1]$, we need to compute integral:
$P_{avg.} = \frac{1}{t_1 - t_0} \times \int\limits_{t_0}^{t_1} P(t) dt$
• If work is constant (time independent), we can compute average power in simpler way using formula:
$P_{avg.}=\frac{W}{t}$
where:
• W is work,
• t is time.
• The power consumed by the electric device can be calculated using the formula:
$P = U \times I$
where:
• 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.
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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