Unit Conversion Online Calculator

***Pressure***
*Input Value:*
*Pressure [atm]*
*Output Value:*
*Pressure [psi]*

***Pressure***
*Input Value:*
*Pressure [psi]*
*Output Value:*
*Pressure [atm]*

***Temperature***
*Input Value:*
*Temperature [K]*
*Output Value:*
*Temperature [F]*

***Temperature***
*Input Value:*
*Temperature [F]*
*Output Value:*
*Temperature [K]*

***Length***
*Input Value:*
*Length [m]*
*Output Value:*
*Length [ft]*

***Length***
*Input Value:*
*Length [ft]*
*Output Value:*
*Length [m]*

***Volume***
*Input Value:*
*Volume [m^3]*
*Output Value:*
*Volume [ft^3]*

***Volume***
*Input Value:*
*Volume [ft^3]*
*Output Value:*
*Volume [m^3]*

***Density***
*Input Value:*
*Density [kg/m^3]*
*Output Value:*
*Density [lbm/ft^3]*

***Density***
*Input Value:*
*Density [lbm/ft^3]*
*Output Value:*
*Density [kg/m^3]*

***Mass***
*Input Value:*
*Mass [kg]*
*Output Value:*
*Mass [lbm]*

***Mass***
*Input Value:*
*Mass [lbm]*
*Output Value:*
*Mass [kg]*

***Velocity***
*Input Value:*
*Velocity [m/s]*
*Output Value:*
*Velocity [ft/s]*

***Velocity***
*Input Value:*
*Velocity [ft/s]*
*Output Value:*
*Velocity [m/s]*

***Force***
*Input Value:*
*Force [N]*
*Output Value:*
*Force [lbf]*

***Force***
*Input Value:*
*Force [lbf]*
*Output Value:*
*Force [N]*

***Energy, Work and Heat***
*Input Value:*
*Energy [J]*
*Output Value:*
*Energy [Btu]*

***Energy, Work and Heat***
*Input Value:*
*Energy [Btu]*
*Output Value:*
*Energy [J]*

***Specific Energy and Work***
*Input Value:*
*Specific Energy ... [J/kg]*
*Output Value:*
*Specific Energy ... [Btu/lbm]*

***Specific Energy and Work***
*Input Value:*
*Specific Energy ... [Btu/lbm]*
*Output Value:*
*Specific Energy ... [J/kg]*

***Power***
*Input Value:*
*Power [kW]*
*Output Value:*
*Power [HP]*

***Power***
*Input Value:*
*Power [HP]*
*Output Value:*
*Power [kW]*

***Specific Entropy, Specific Heat and Gas Constant***
*Input Value:*
**Specific Entropy ... [J/kgK]***
*Output Value:*
**Specific Entropy ... [Btu/lbmR]***

***Specific Entropy, Specific Heat and Gas Constant***
*Input Value:*
**Specific Entropy ... [Btu/lbmR]***
*Output Value:*
**Specific Entropy ... [J/kgK]***

Kappa, Gas Constant and Specific Heat Values

Gas

Gas

Kappa
[/]

Gas Constant
[J/kg*K]

Specific Heat
[J/kg*K]

Air

1.4

286.7

1,004

Ammonia

NH₃

1.3

488.2

2,092

Argon

Ar

1.67

208.1

519

Carbon Dioxide

CO₂

1.28

188.9

845

Carbon Monoxide

CO

1.4

296.8

1,042

Helium

He

1.66

2,078.5

5,200

Hydrogen

H₂

1.4

4,124

14,350

Methane

CH₄

1.32

518.2

2,223

Nitrogen

N₂

1.4

296.9

1,038

Oxygen

O₂

1.4

259.8

916

Water Vapor

H₂O

1.33

188.5

1,690

***Kappa, Gas Constant and Specific Heat Values***
*Gas*	*Gas*	Kappa [/]	Gas Constant [J/kg*K]	Specific Heat [J/kg*K]
*Air*		*1.4*	*286.7*	*1,004*
*Ammonia*	*NH₃*	*1.3*	*488.2*	*2,092*
*Argon*	Ar	*1.67*	*208.1*	*519*
*Carbon Dioxide*	*CO₂*	*1.28*	*188.9*	*845*
*Carbon Monoxide*	CO	*1.4*	*296.8*	*1,042*
*Helium*	He	*1.66*	*2,078.5*	*5,200*
*Hydrogen*	H₂	*1.4*	*4,124*	*14,350*
*Methane*	*CH₄*	*1.32*	*518.2*	*2,223*
*Nitrogen*	N₂	*1.4*	*296.9*	*1,038*
*Oxygen*	O₂	*1.4*	*259.8*	*916*
*Water Vapor*	*H₂O*	*1.33*	*188.5*	*1,690*

Here are some of the frequently used energy conversion factors when dealing with engineering calculations related to energy conversion systems:

Mass

1 kg = 2.2046 lbm
1 lbm = 0.4536 kg

Density

1 kg/m^3 = 0.06243 lbm/ft^3
1 lbm/ft^3 = 16.02 kg/m^3

Force

1 N = 0.2248 lbf
1 lbf = 4.448 N

Length

1 m = 3.2810 ft
1 ft = 0.3048 m

Temperature

F = C * 1.8 + 32
F = R - 460
C = (F - 32) / 1.8
C = K - 273

Pressure

1 atm = 14.696 psi
1 psi = 0.068 atm

Volume

1 m^3 = 35.32 ft^3
1 ft^3 = 0.0283 m^3

Energy, Work, Heat

1 kJ = 0.948 Btu
1 Btu = 1.055 kJ
1 Btu = 778 lbf*ft
1 kWhr = 3,412 Btu

Power

1 kW = 56.91 Btu/min
1 Btu/min = 778 lbf*ft/min
1 kW = 1.341 HP
1 HP = 550 lbf*ft/s

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