Convert Units IP-SI

Input Multiply Output
Units By Units
( k = 1,000, m = 1,000,000 )
Length
ft 0.3048 m
in 2.54 cm
in 0.0254 m
miles 1.60934 km
yds 0.9144 m
Areas
ft/sec2 0.3048 m/sec2
acre 0.004047 sq.km
sq.ft 0.0929 sq.m
sq.in 6.4516 sq.cm
sq.miles 2.59 sq.km
sq.yd 0.83613 sq.m
Density
lbs/ft3 0.01602 kgs/liter
lbs/ft3 16.0185 kgs/m3
lbs/in3 27.68 gms/cm3
lbs/in3 27679.9 gms/liter
lbs/gal 0.11983 gms/cm3
lbs/gal 119.83 kgs/m3
lbs/gal 0.11983 kgs/liter
Energy
btu 251.996 cals
btu 0.251996 k-cals
btu 1.0551 kJ
btu ####### kwh
btu 1055.056 watt-secs
btu 1054.728 Joules (J)
btu 1054.728 newton-m
jp 2.648 E 6 J or N-M
hp 632.415 k-cals
therms 2.52 E 7 cals
therms 1.055 E 8 J or N-M
Enthalpy
btu/lb 0.55555 cals/gm
btu/lb 0.55555 k-cals/kg
btu/lb 2.326 J/gm
btu/lb 2.326 k-J/kg
Force (Weight)
oz 28.349 gms
oz 0.02835 kgs
oz 0.278 newtons
lbs 4.448 newtons
lbs 0.4536 kgs
lbs ####### metric tons
Mass Flow
lbs/hr 0.454 kgs/hr
lbs/hr.ft2 0.001356 kgs/hr.ft2
lbs/sec.ft2 4.8824 kgs/sec.m2
Mass
lbs H2O 0.000454 m3 (60 F)
tons long 1.016 tons metric
tons long 1016.047 kgs
tons short 907.185 kgs
tons long 2240 lbs
tons short 2000 lbs
Input Multiply Output
Units By Units
Calorific Values (volume basis)
btu/ft3 37.259 k-J/m3
btu/ft3 8.899 k-cal/m3
therms/ft3 3725.89 m-J/m3
Coeff. Of Exp. (volumetric)
lbs/ft3.F 28.833 kgs/cm3.C
Heat Capacity (specific heat)
btu/lb.F 4186.8 J/kg.C
Heat Flux Density (Q) (W=J/sec)
btu/hr.ft2 3.1546 W/m2
Thermal Conductivity (k) (W=J/sec)
btu.ft/hr.ft2.F 1.731 W/m.C
btu.ft/hr.ft2.F 0.14423 W/m.C
Resistance / Length ( R = 1/k)
F.ft2.hr/btu.ft 0.578 C.m/W
F.ft2.hr/btu.in 6.933 C.m/W
Heat Transfer Coeff. (U) (W=J/sec)
btu/hr.fr2.F 5.6783 W/m2.C
Conductance ( C, h ) (W=J/sec)
btu/hr.ft2.F 5.6789 W/m2.C
Resistance ( 1/U, 1/h, L/k, 1/C )
F.ft2.hr/btu 0.1761 C.m2/W
Pressure
atmos 10332.27 kgf/m2
atmos 1013.25 millibars
atmos 101325 N/m2 (Pa)
ft.H2O 304.398 kgf/m2
ft.H2O 2985.13 N/m2 (Pa)
in.H2O 25.367 kgf/m2
in.H2O 2.487 millibars
in.H2O 1.865 mm.Hg
in.H2O 248.76 N/m2 (Pa)
in.Hg 345.315 kgf/m2
in.Hg 25.4 mm.Hg
in.Hg (60F) 3376.8 N/m2 (Pa)
in.Hg (32F) 3386.39 N/m2 (Pa)
lbsf/ft2 ####### atmos
lbsf/ft2 0.4788 millibars
lbsf/ft2 4.488243 kgf/m2
lbsf/ft2 0.35913 mm.Hg
lbsf/ft2 47.88 N/m2 (Pa)
lbsf/in2 0.068046 atmos
lbsf/in2 68.947 millibars
lbsf/in2 6854.76 N/m2 (Pa)
atmos 33.9 ft H20
atmos 29.921 in.Hg
ft.H2O 62.345 lbf/ft2
ft.H2O 0.433 lbf/in2
lbsf/in2 2.31 ft.H2O
Power
btu/hr 0.2931 watts (J/sec)
btu/hr 0.000293 kw
btu/min 17.584 watts (J/sec)
btu/min 0.017584 kw
hp boiler 33472 btu/hr
hp electric 2545.46 btu/hr
Input Multiply Output
Units By Units
Horse-Power
hp-boiler 13.15 hp electric
hp boiler 9.81 kw
hp electric 0.076 hp boiler
hp electric 1.0143 hp metric
hp electric 746 watts (J/sec)
hp electric 0.746 kw
hp metric 0.7355 kw
Velocity
ft/min 0.508 cm/sec
ft/min 0.01829 km/hr
ft/sec 30.48 cm/sec
ft/sec 1.0973 km/hr
ft/sec 18.288 m/min
mph 44.704 cm/sec
mph 1.609344 km/hr
mph 26.822 m/min
mph 0.4471 m/sec
knots 0,5144 m/sec
mph 0.869 knots
Volume Flow (gpm water)
ft3/hr 7.865791 cm3/sec
ft3/hr 0.028317 m3/hr
ft3/hr 0.47195 liters/min
ft3/hr 471.948 cm3/sec
ft3/min 1.699 m3/hr
ft3/min 0.47195 liters/sec
ft3/min 7.48052 gpm
ft3/min 62.3456 lbs H20/m
gpm 0.22713 m3/hr
gpm 3.7854 liters/min
gpm 3785.4 cm3/sec
gpm 0.1337 ft3/min
Volume (gals water)
ft3 28317 cm3
ft3 0.028317 m3
in3 16.3871 cm3
in3 1.16387 E -5 m3
in3 0.016387 liters
yds3 0.7645 m3
gals 3785.41 cm3
gals 0.003785 m3
gals 3.78541 liters
oz 29.57353 cm3
oz 2.96E-05 m3
oz 0.029573 liters
in3 0.554 oz
ft3 7.481 gals
ft3 62.357 lbs H2O
gals 128 oz
gals 4 quarts
quarts 2 pints
Specific Volume
ft3/lb 62.428 cm3/gm
ft3/lb 0.06243 m3/kg
ft3/lb 62.428 liters/kg

About the Author

Varkie Thomas
Varkie C. Thomas, Ph.D., P.E. Research Professor College of Architecture Illinois Institute of Technology Chicago, Illinois, USA

Varkie Thomas taught graduate courses in Energy Efficient Building Design, Building Energy Performance Analysis and advised doctoral candidates (1996-2008) as an Adjunct Professor at Illinois Institute of Technology (IIT) from SOM. He is currently a Research Professor with the Ph.D. program at IIT. He was a member of the UN Technical Program to China in 1991 and a Visiting Professor from Purdue in Malaysia in 1996/97 funded by the World Bank.

Academic: B.Sc. (Honors) in Mathematics from St. Xavier’s College Bombay University; Post-Graduate Diploma in Environmental Engineering from London South Bank University; Post-Graduate Diploma (with Distinction) and Ph.D. in Industrial Management from Strathclyde University Glasgow. Registered Professional Engineer (P.E.) and Certified Energy Manager (CEM - Association. of Energy Engineers).