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● Conversions of Units ●

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time | energy | power | density | velocity | acceleration | force

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Unit conversion table

Physical quantity Symbol Conversion factor
Acceleration a or g foot/second2, meter/second2, gal, galileo, inch/second2
    1 m/s2 = 3.280839895 ft/s2
    1 ft/s2 = 0.3048 m/s2
    1 g = 9.80665 m/s2 = 32.17404856 ft/s2
Area A acre, are, barn, foot2, hectare, inch2, mile2, section, meter2, township, yard2
    1 m2 = 1550,0031 in2 = 10.76391041671 ft2 = 1.196 yd2 = 3.861×10-7 mile2 - in = inch
    1 ft2 = 0.09290304 m2 = 144 in2 = 0.1111 yd2 = 3.587×10-8 mile2  
    1 in2 = 6.4516 cm2 = 6.4516×10-4 m2 = 6.944×10-3 ft2 = 7.716×10-4 yd2 = 2.491×10-10 mile2  
    1 yd2 = 0.8361 m2 = 1296 in2 = 9 ft2 = 0.3228×10-6 mile2 
    1 mile2 = 2.58998811×106 m2 = 0.4015×1010 in2 = 2.788×107 ft2 = 3.098×106 yd2 
    1 acre = 1/640 mile2 = 0.404686 ha = 4046.86 m2
    1 km2 = 102 ha2 = 106 m2 = 1010 cm2 = 1012 mm2
    1 ha2 = 104 m2 = 108 cm2 = 1010 mm2
    1 cm2 = 10-4 m2 = 0.15500031 in2
    1 mm2 = 1.5500031×10-3in2
    1 township = 9.323957×107 m2
    1 section = 2.589×106 m2
Density ρ gram/centimeter3, lmb/inch3, lbm/foot3, slug/foot3, kilogram/meter3
    1 lb/ft3 = 16.018 kg/m3
    1 slug/ft3 = 515.379 kg/m3
    1 kg/l = 62.43 lb/ft3
    1 kg/m3 = 0.0624 lb/ft3
Energy Q or W British Thermal Unit (Btu), calorie, joule, kilojoule, electron volt, erg, foot lbf, foot poundal, kilocalorie, kilowatt hour, watt hour,   
    1 J (Joule) = 0.1020 kpm = 2.778×10-7 kWh = 2.389×10-4 kcal = 0.7376 ft lbf = 1 (kg m2)/s2 = 1 watt second = 1 Nm = 1 ft lb = 9.478×10-4 Btu
    1 kpm = 9.80665 J = 2.724×10-6 kWh = 2.342×10-3 kcal = 7.233 ft lbf =  9.295×10-3 Btu
    1 kWh = 3.6×106 J = 3.671×105 kpm = 859.9 kcal = 2.656×106 ft lbf =  3412×10-3 Btu
    1 kJ = 1 kNm = 1kWs = 103 J = 0.947813 Btu = 0.23884 kcal
    1 Btu (British thermal unit) = 1055.06 J = 107.6 kpm = 2.931×10-4 kWh = 0.252 kcal = 778.16 ft lbf = 1.055×1010 ergs = 252 cal = 0.293 watt hour
    1 cal = 4.186 J
    1 kcal  = 4186.8 J = 426.9 kp m = 1.163×10-3 kWh = 3.088 ft lbf  = 3.9683 Btu  = 1000 cal
    1 ft lbf (foot pound force) = 1.3558 J = 0.1383 kp m = 3.766×10-7 kWh = 3.238×10-4 kcal = 1.285×10-3 Btu
    1 hp h (horse power hour) = 2.6846×106 J = 0.7457 kWh
    1 erg = 1 (g cm2)/s2 = 10-7 J
    1 eV = 1.602×10-19 J
    1 Q = 1018 Btu = 1.055×1021 J
    1 Quad = 1015 Btu
    1 kg m = 7.233 ft lb = 0.00929 Btu = 9.806 Joule
Energy per unit mass   1 kJ/kg = 0.4299 Btu/ lbm = 0.23884 kcal/kg
Force F dyne, kilogram force (kgf), kilopound force, kip, lbf (pound force), ounce force (avoirdupois), poundal, newton
    1 N (Newton) = 0.1020 kp = 0.2248 lbf = 7.232 pdl = 1 (kg m)/s2
    1 lbf (Pound force) = 4.44822 N = 0.4536 kp = 32.17 pdl = 4.448×105 dyn
    1 dyn = 1 (g cm)/s2
    1 kg has a weight of 1 kgf = 1 kp
    1 kgf = kp (Kilopond)  = 9.80665 N = 2.205 lbf = 70.93 pdl
    1 pdl (Poundal) = 0.13826 N = 0.01409 kp = 0.03108 lbf
Heat flow rate q  
    1 Btu/sec = 1055.1 W
    1 kW (kJ/s) = 102.0 kpm/s = 859.9 kcal/h = 3413 Btu/h = 1.360 hk = 1.341 hp = 738 ft lb/s = 1000 J/s = 3.6×106 J/h 
    1 kpm/s = 9.8067×10-3 kW =  8.432 kcal/h = 32.47 Btu/h = 0.01333 hk = 0.01316 hp = 7.237 ft lb/s
    1 kcal/h = 1.163×10-3 kW = 0.1186 kpm/s =   3.969 Btu/h = 1.582×10-3 hk =
1.560×10-3 hp = 0.8583 ft lb/s
    1 Btu/h = 2.931×10-4 kW = 0.0299 kpm/s = 0.252 kcal/h = 3.986×10-4 hk =
3.939×10-4 hp = 0.2163 ft lb/s
    1 kcal/h = 1.16×10-3 kW
    1 hk (metric horse power)  = 0.735499 kW = 75.00 kpm/s = 632.5 kcal/h =  2510 Btu/h = 0.9863 hp = 542.8 ft lb/s
    1 hp  = 0.74570 kW = 76.04 kpm/s = 641.2 kcal/h =   2545 Btu/h = 1.014 hk = 550.3 ft lb/s
    1 ft lb/s = 1.35501 kW = 0.1382 kpm/s = 1.165 kcal/h = 4.625 Btu/h = 1.843×10-3 hk = 1.817×10-3 hp
Heat flux q'' 1 Btu/ft2 = 2.713 kcal/m2 = 2.043×104 J/m2K
    1 Btu/ ft2 h = 3.1525 W/m2
    1 Btu/ft2 °F = 4.88 kcal/m2K = 2.043×104 J/m2K
    1 kcal/m2 = 0.369 Btu/ft2
    1 kcal/m2K = 0.205 Btu/ft2oF
Heat generation per unit volume q'''G 1 Btu/ft3 = 8.9 kcal/m3 = 3.73×104 J/m3
    1 Btu/ft3 h = 10.343 W/m3
    1 kcal/m3 = 0.112 Btu/ft3
Heat generation per unit mass   1 Btu/lb = 0.556 kcal/kg = 2326 J/kg
    1 kcal/kg = 1.800 Btu/lb
Heat transfer coefficient hc 1 Btu/ft2 h°F  = 5.678 W/m2 K = 4.882 kcal/h m2 °C
    1 W/m2K = 0.85984 kcal/h m2 °C = 0.1761 Btu/ ft2 h °F
    1 kcal/h m2 °C = 1.163  W/m2K = 0.205 Btu/ ft2 h °F
Length, distance L or d feet, meters, centimeters, kilometers, miles, furlongs, yards, micrometers, inches, angstrom, cubit, fathom, foot, hand, league, light year, micron, mil, nautical mile, rod
    1 m (meter) = 3.2808 ft = 39.37 in = 1.0936 yd = 6.214×10-4 mile
    1 km = 0.621 mile
    1 in (inch) = 25.4 mm = 2.54 cm = 0.0254 m = 0.08333 ft = 0.02778 yd = 1.578×10-5 mile
    1 mil = 0.001 inch = 2.54×10-5 m = 2.54×10-2 mm
    1 ft (foot) = 0.3048 m = 12 in = 0.3333 yd = 1.894×10-4 mile
    1 mm = 10-3m
    1 cm = 10-2 m = 0.394 in = 0.0328 ft
    1 mm = 0.03937 in
    1 Ĺ (Ĺngstřm) = 10-10 m
    1 mile = 1.6093 km = 1609.3 m = 63346 in = 5280 ft = 1760 yd
    1 yd (yard) = 0.9144 m = 36 in = 3 ft = 5.682×10-4 mile
Mass, weight m pounds, kilograms, grams, ounces, grains, tons (long), tons (short), tons (metric), carat, grain, ounce mass, pound mass (lbm), slug, tonne
    1 kg = 1000 g = 2.2046 lb = 6.8521×10-2 slug
    1 lb = 0.4536 kg = 453.6 g = 7000 grains = 0.03108 slug
    1 slug = 14.594 kg  = 32.174 lbm
    1 grain = 0.000143 lb = 0.0648 g
    1 g = 15.43 grains = 0.0353 oz = 0.002205 lb
    1 tonne = 103 kg = 106 g = 109 mg = 0.984 tons
    1 oz = 28.35 g
Mass flow rate m' 1 lb/h = 1.26×10-4 kg/s
    1 lb/s = 0.4536 kg/s
    1 lb/min = 7.56×10-3 kg/s = 27.216 kg/s
    1 kg/s = 3600 kg/h = 132.28 lb/min
    1 kg/h = 2.778×10-4 kg/s = 3.67×10-2 lb/min
Power P horsepower, kilowatt, watt, btu/second, calorie/second, foot lbf/second, kilocalorie/second
    1 W = 1 kg m2/s3 = 1 Nm/s = 1 J/s
    1 kW = 1000 W = 3412 Btu/h
    1 hp (English horse power) = 745.7 W = 550 ft lb/s = 2545 Btu/h = 33.000 ft lb/m = 1.0139 metric horse power
    1 metric horse power = 736 W = 75 kg m/s = 0.986 English horse power
    1 ft lb/s = 1.3558 W
    1 Btu/s = 1055.1 W
    1 Btu/h = 0.293 W
Power per unit area   1 W/m2 = 0.3170 Btu/(h ft2) = 0.85984 kcal/(h m2)
Pressure p atmosphere, centimeters of mercury, foot of water, bar, barye, centimeter of water, dyne/centimeter2, inch of mercury, inch of water, kgf/centimeter2, kgf/meter2, lbf/foot2, lbf/inch2 (psi), millibar, millimeter of mercury, pascal, torr, newton/meter2    
    1 N/m2 = 1 Pa  = 1.4504×10-4 lb/in2 = 1×10-5 bar = 4.03×10-3 in water = 0.336×10-3 ft water = 0.1024 mm water = 0.295×10-3 in mercury = 7.55×10-3 mm mercury = 0.1024 kg/m2 = 0.993×10-5 atm
    1 Pa = 10-6 N/mm2 = 10-5 bar = 0.1020 kp/m2 = 1.02×10-4 m H2O = 9.869×10-6 atm = 1.45×10-4 psi (lbf/in2)
    1 N/mm2 = 106 Pa = 10 bar = 1.020×105 kp/m2 = 102.0 mH2O = 9.869 atm = 145.0 psi (lbf/in2)
    1 mmHg = 1 torr = 0.01934 lb/in2
    1 atm = 101325 Pa (N/m2) = 1.013×102 kN/m2 = 1.033×104 kp/m2 = 1.033 kp/cm2 = 1.013 bar = 14.696 psi (lb/in2) = 407.1 in H2O at 62 0F (16.7 0C) = 10.33 m H2O at 62 0F (16.7 0C) = 30 in mercury at 62 0F (16.7 0C) = 760 mm mercury at 62 0F (16.7 0C) = 760 torr
    1 bar =  105 Pa (N/m2) = 0.1 N/mm2 = 10197 kp/m2 = 10.20 m H2O = 0.9869 atm = 14.50 psi (lbf/in2) = 106 dyn/cm2
    1 kp/m2 = 9.81 Pa (N/m2) = 9.807×10-6 N/mm2 = 10-3 m H2O = 1 mm H2O = 0.9681×10-4 atm = 1.422×10-3 psi (lb/in2)  = 0.0394 in H2O = 0.0736 mm mercury
    1 psi (lb/in2) = 6894.8 Pa (N/m2) = 6.895×10-3 N/mm2 = 6.895×10-2 bar = 27.71 in H2O at 62 0F (16.7 0C) = 703.1 mm H2O at 62 0F (16.7 0C) = 2.0416 in mercury at 62 0F (16.7 0C) = 51.8 mm mercury at 62 0F (16.7 0C) = 703.6 kg/m2 = 0.06895 atm
    1 lb/ft2 = 47.88 N/m2
    1 dyn/cm2 = 145.04×10-7 lbf/in2
    1 in mercury (Hg) = 3376.8 N/m2= 0.49 lb/in2 = 12.8 in water
    1 in water  = 248.8 N/m2= 0.0361 lb/in2 = 25.4 kg/m2 = 0.0739 in mercury
    1 m H2O = 9806.7 Pa = 9.807×10-3 N/mm2  = 0.0987 bar = 1000 kp/m2 =  0.09678 atm = 1.422 psi (lbf/in2)
    1 mm water = 9.81 Pa (N/m2) = 1 kg/m2 = 0.0736 mm mercury = 0.9677×10-4 atm
    1 mm mercury = 0.0193 lb/in2 = 133 N/m2 = 12.8 mm water
Rotation   Revolutions 
    1 r/min = 0.01667 r/s = 0.105 rad/s
    1 r/s = 60 r/min = 6.28 rad/s
    1 rad/s = 9.55 r/min = 0.159 r/s
Specific energy Q/m  
    1 Btu/lbm = 2326.1 J/kg = 0.55556 kcal/kg
    1 J/kg = 0.43 Btu/lbm =  2.39×10-4 kcal/kg
    1 kcal/kg = 1.80 Btu/lbm = 4187 J/kg
Specific heat capacity c 1 J/(kg K) = 2.389×10-4 kcal/(kg °C) = 2.389×10-4 Btu/(lbm °F)
    1 Btu/(lbm °F) = 4186.8 J/(kg K) = 1 kcal/(kg °C)
    1 kcal/(kg °C) = 4186.8 J/(kg K)  = 1 Btu/(lbm °F)
Temperature T celsius, rankine, kelvin, centigrade, fahrenheit
    1 °C = 1.8 °F
   1 °F = 0.555 °C
    0 °C corresponds to 32 °F, 273.15 K and 491.69 R
    °R = (9/5) × K
    °F = °C × (9/5) + 32
    °F = [K - 273,15] × (9/5) + 32
    °C = 5/9 × [°F - 32]
Thermal conductivity k 1 W/(m K) = 0.85984 kcal/(h m °C) = 0.5779 Btu/(ft h °F)
    1 Btu/(ft h °F) = 1.731 W/(m K) = 1.488 kcal/(h m °C)
    1 kcal/(h m °C) = 1.163 W/(m K) =  0.6720 Btu/(ft h °F)
Thermal diffusivity a  1 ft2 / s = 0.0929 m2/s
    1 ft2 / h = 2.581×10-5 m2/s
Thermal resistance Rt  1 (h °F)/Btu = 1.8958 K/W
Time t year, month, day, hour, minute, second, millisecond
    1 h = 3600 s = 60 min
    1 ms = 10-3 s
    1 ms = 10-6 s
    1 ns = 10-9 s
Velocity, speed V foot/second, inch/second, meter/second, kilometer/hour, knot, mile/hour 
    1 ft/s = 0.3048 m/s
    1 ft/min = 5.08×10-3 m/s = 0.0183 km/h = 0.0114 mph
    1 mph = 0.44703 m/s = 1.609 km/h = 88 ft/min
    1 m/s = 3.6 km/h = 196.85 ft/min = 2.237 mph
    1 km/h = 0.2778 m/s = 54.68 ft/min = 0.6214 mph
Viscosity dynamic µ  
    1 lb/(ft s) = 1.4879 Pa s = 14.88 P = 1488 cP = 0.1517 kp s/m2
    1 cP (Centipoise) = 10-3 Pa s = 0.01 P = 1.020×10-4 kp s/m2 = 6.721×10-4 lb/(ft s) = 0.00100 (N s)/m2
    1 kg/(m s ) = 1 (N s)/m2 = 0.6720 lbm/(ft s) = 10 Poise
    1 P (Poise) = 0.1 Pa s = 100 cP = 1.020×10-2 kp s/m2 = 6.721×10-2 lb/(ft s) = 0.1 kg/ms
    1 Pa s (N s/m2) = 10 P (Poise) = 103 cP  = 0.1020 kp s/m2 = 0.6721 lb/(ft s)
    1 kp s/m2 = 9.80665 Pa s = 98.07 P = 9807 cP = 6.591 lb/(ft s)
Viscosity cinematic    
    1 ft2/s = 0.0929 m2/s
    1 ft2/ h = 2.581×10-5m2/s
    1 St (Stokes) = 1×10-4 m2/s = 100 cSt = 1.076×10-3 ft2/s
    1 m2/s = 104 St = 106 cSt = 10.764 ft2/s  
    1 cSt (Centistokes) = 10-6 m2/s = 0.01 St = 1.076×10-5 ft2/s 
Volume V barrel, gallon, cubic centimeter (cm3), cubic feet (foot3), cubic inch (inch3), cubic meter (meter3), cubic yard (yard3), quarts, liters, acre foot, board foot, bushel, cord, cup, dram, fluid ounce, peck, pint, quart.
1 tablespoon = 3 teaspoons = 1/2 fluid ounce = 15 mL and 1 teaspoon = 1/3 tablespoon = 5 mL and 1 teaspoon = 1/3 tablespoon = 5 mL and 1 teaspoon = 1/3 tablespoon = 5 ml
    1 ft3 = 0.02832 m3= 28.32 dm3 = 0.03704 yd3 = 6.229 Imp. gal (UK) = 7.481 gal (US)
    1 in3 = 1.6387×10-5 m3 = 1.639×10-2 dm3 (liter) = 16.39 cm3 = 16390 mm3   
    1 gal (U.S.) = 3.785×10-3 m3 = 3.785 dm3 (liter) = 0.13368 ft3 = 4.951×10-3 yd3 = 0.8327 Imp. gal (UK)
    1 Imp. gal (UK) = 4.546×10-3 m3 = 4.546 dm3 = 0.1605 ft3 = 5.946×10-3 yd3 = 1.201 gal (US)
    1 dm3 (liter) = 10-3 m3 = 0.03532 ft3 = 1.308×10-3 yd3 = 0.220 Imp gal (UK) = 0.2642 gal (US)
    1 yd3 = 0.7646 m3 = 764.6 dm3 = 27 ft3 = 168.2 Imp. gal (UK) = 202.0 gal (US)
    1 pint = 0.568 dm3 (liter)
    1 km3 = 109 m3 = 1012 dm3 (liter) = 1015 cm3 = 1018 mm3
    1 cm3 = 0.061 in3
    1 m3 = 103 dm3 (liter) = 35.31 ft3 = 1.308 yd3 = 220.0 Imp. gal (UK) = 264.2 gal (US)
Volume flow    
    1 kg/s (water) = 13.20 Imp. gal (UK)/min
    1 m3/s = 3600 m3/h = 1000 dm3(liter)/s = 35.32 ft3/s = 2118.9 ft3/min = 13200 Imp.gal (UK)/min = 15852 gal (US)/min
    1 m3/h = 2.7778×10-4 m3/s = 0.2778 dm3(liter)/s = 9.810×10-3 ft3/s = 0.5886 ft3/min = 3.667 Imp.gal (UK)/min = 4.403 gal (US)/min
    1 m3/h = 103 dm3(liter)/h = 16.67 dm3(liter)/min = 0.27878 dm3(liter)/s
    1 ft3/min = 1.7 m3/h = 0.47 l/s
    1 dm3(liter)/s = 10-3 m3/s = 3.6 m3/h = 0.03532 ft3/s = 2.1189 ft3/min = 13.200 Imp.gal (UK)/min = 15.852 gal (US)/min = 792 Imp. gal (UK)/h
    1 dm3(liter)/s = 60 liter/min = 3600 liter/h
    1 ft3/s = 0.0283168 m3/s = 101.9 m3/h = 28.32 dm3(liter)/s = 60 ft3/min = 373.7 Imp.gal (UK)/min = 448.9 gal (US)/min
    1 Imp.gal (UK)/min = 7.57682×10-5 m3/s = 0.0273 m3/h = 0.0758 dm3(liter)/s = 2.675×10-3 ft3/s = 0.1605 ft3/min = 1.201 gal (US)/min
    1 gal (US)/min = 6.30888×10-5 m3/s = 0.0227 m3/h = 0.0631 dm3(liter)/s = 2.228×10-3 ft3/s = 0.1337 ft3/min = 0.8327 Imp.gal (UK)/min
 
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