          Units of Weight and Measurement - Conversion Factors Unidades de Peso e Medida - Factores de Conversão

 When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind: it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science. William Thomson, Lord Kelvin, Popular Lectures and Addresses [1891-1894]

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Prefixes of SI Units Write it right
 Common mistake Correct Remarks 25m 25 m ALWAYS with a space between the numerical value and the SI symbol 20°F, 20°C 20 °F, 20 °C ALWAYS with a space between the numerical value and the SI symbol 25m 25 m Unit symbols are NOT exponents 75 mts, 100lts 75 m, 100 l (or 100 L) Unit symbols are NOT abbreviations 25 ms, kgs, kWs 25 m, kg, kW Unit symbols are inaltered in the plural 50 m. 25 m NO end period, except as normal punctuation at the end of a sentence KW, kw kW See SI Prefixes kW/h kW.h i.e., power x time = energy amp A Use standard SI terminology 100 w, 500 pa 100 W, 500 Pa First letter of a SI symbol (named after a proper name) is always a capital 45 ° 45° Referring to angle measurements 125°K, 300 °K 125 K, 300 K The SI unit of thermodynamic temperature is kelvin (K) not °K 20 degree centigrade 20 degree Celsius "centigrade" (temperature scale) has been deprecated since 1948 kph km/h Use standard SI terminology 100 joules, 500 watts 100 joule, 500 watt When writting units in full derived from the proper name of individuals quilómetro/h km/h Do not mix unit names with unit symbols 5 kiloyears 5000 days SI prefixes are not used with angle and time units 30 sec 30 s Use standard SI terminology 750 cc, 750 cm3 750 cm³ Use standard SI terminology 75% 75 % By extension from the SI rules 1 mµm 1 nm Do not use compound prefixes 5 m (16.404 foot) 5 m (16 foot) Express the secondary value with an accuracy comparable to the original 25.000 (twenty-five thousand) 25 000 Except in tabular form, write 1234 (4 digits only), and 12 345 (5+ digits) duzentas gramas duzentos gramas Yeap! "grama" is a masculin noun in Portuguese... gravidade específica (*) massa volúmica For "specific gravity", when numerical value has units (e.g., 5 kg/m³) gravidade específica (*) densidade For "specific gravity", when numerical value has NO units (e.g., 1,0) densidade massa volúmica For "specific gravity", when numerical value has units (e.g., 10 kg/m³) (*) "gravidade específica" is a complete aberration in Portuguese!

Take note

The table below uses scientific notation for the writing of the conversion factors: 3.45E-4 = 3.45 x 10-4 = 0.000345

In this table, decimal separators are periods: 0.40469 (US/UK) = 0,40469 (Europe)

Also, in this table, thousands separators are commas: 43,560 (US/UK) = 43.560 (Europe) = 43 560 (ISO)

 Multiply X By X Calculator For all your conversion calculations with the conversion factors below
Multiply By Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit acre x 0.404 69 = hectare acre x 43,560 = square foot (ft2) acre x 4,046.873 = square meter (m2) acre x 640 = square mile (mi2) acre x 4840 = square yard (yd2) acre-foot x 7,758 = barrel acre-foot x 43,560 = cubic foot (ft3 or cf) acre-foot x 1,233 = cubic meter (m3) acre-foot x 325,851 = gallon (US) angstrom unit x 1.0E-10 = meter (m) atmosphere x 1.013 = bar atmosphere x 76.0 = centimeter of mercury atmosphere x 33.90 = feet of water atmosphere x 1.033 = kilogram/square centimeter atmosphere x 101.325 = kilopascal (kPa) atmosphere x 10.33 = meters of water atmosphere x 1,013.25 = millibar (mb) atmosphere x 1.013250E+05 = pascal (Pa) atmosphere x 14.696 = pound/square inch Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit balthazar (wine) x 12 = liter (L) barrel (crude oil) x 5.6146 = cubic foot of crude oil barrel (crude oil) x 0.158 987 3 = cubic meter of crude oil barrel (crude oil) x 42 = gallon of crude oil, US barrel (crude oil) x 158.987 294 9 = liter of crude oil barrel (crude oil) x 0.136 = metric ton of crude oil barrel (oil)/day x 0.029 2 = gallon (US)/minute barrel (oil)/day x 1.84 = cubic centimeter/second barrel (oil)/day x 0.159 = cubic meter (m3)/day barrel (oil)/day x 0.159 = liter/day barrel (crude oil) x 0.15 = short ton of crude oil barrel, US liquid x 0.75 = barrel of crude oil barrel, US liquid x 31.5 = gallon, US bar x 0.986 923 = atmosphere bar x 750.0616 = millimeter of mercury (mmHg) bar x 14.50 = pound/square inch board foot x 0.002 360 = cubic meter (m3) Board of Trade unit (BOTU) x 1 = kilowatt.hour (kW.h) (in the UK) british thermal unit (BTU) x 3.931E-04 = horsepower-hour british thermal unit (BTU) x 0.000 292 8 = kilowatt-hour (kW.h) BTU x 778.2 = foot-pounds BTU x 0.000 393 1 = horsepower.hour (HP.h) BTU x 1055 = joule BTU/hour square foot °F x 5.678 263 398 = watt/square meter °C BTU/hour square foot °F x 0.453 592 374 35 = kilocalorie/hour square foot °C BTU/minute x 0.023 56 = horsepower BTU/minute x 0.017 57 = kilowatt (kW) BTU/pound x 0.555 555 = calorie/gram BTU/pound x 2.326 = kilojoule/kilogram (kJ/kg) bushel, US x 0.035 239 07 = cubic meter (m3) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit calorie (cal) x 4.186 8 = joule (J) caneca (beer, Portugal) x 0.4 = liter (L) carat (metric) x 200 = milligram (mg) centimeter (cm) x 0.394 = inch (in) centimeter of mercury x 0.44 = foot of water centimeter/second x 0.036 = kilometer/hour centimeter/ square second x 0.032 808 4 = foot per square second (ft/s2) centipoise x 0.01 = poise centipoise x 0.01 = gram/centimer.second (g/cm.s) centipoise x 0.001 0 = pascal-second centipoise x 6.72E-04 = pound/ft-sec cord x 128 = cubic foot (ft3 or cf) cubic centimeter (cm3) x 3.531E-05 = cubic foot (ft3 or cf) cubic centimeter (cm3) x 0.061 02 = cubic inch (in3) cubic centimeter (cm3) x 2.642E-04 = gallon, US liquid cubic centimeter (cm3) x 1.0E-03 = liter (L) cubic foot (ft3 or cf) x 28,320 = cubic centimeter (cm3) cubic foot (ft3 or cf) x 1728 = cubic inch (in3) cubic foot (ft3 or cf) x 7.48 = gallon, US liquid cubic foot (ft3 or cf) x 28.316 8 = liter (L) cubic foot (ft3 or cf) x 2.831685E-02 = cubic meter cubic foot (ft3 or cf) x 0.037037 = cubic yard (exactly: 1/27) cubic foot (ft3 or cf) x 0.1781076 = oil barrel cubic foot/minute x 472 = cubic centimeter/second cubic foot/minute x 4.72E-4 = cubic meter/second cubic foot/minute x 0.12 = gallon/second cubic foot/minute x 1699.011 = liter/hour cubic foot/minute x 0.471 947 4 = liter/second cubic foot/second x 448.8 = gallons/minute cubic foot/second x 1699 = liters/minute cubic inch (in3) x 16.387 06 = cubic centimeter (cm3) cubic inch (in3) x 1.639E-05 = cubic meter (m3) cubic inch (in3) x 4.329E-03 = gallon (gal) cubic inch (in3) x 0.016 387 06 = liter (L) cubic meter (m3) x 35.315 = cubic foot (ft3 or cf) cubic meter (m3) x 1.307 950 619 = cubic yard (yd3) cubic meter (m3) x 264.20 = gallon, US liquid cubic meter (m3) x 1,000 = liter (L) cubic meter/hour (m3/h) x 0.58858 = cubic foot/min (ft3/min) cubic meter/kilogram (m3/kg) x 16.02 = cubic foot/pound (ft3/lb) cubic meter/sec (m3/s) x 15,850 = gallon/minute cubic meter/sec (m3/s) x 2118 = cubic foot/minute cubic meter/sec (m3/s) x 60,000 = liter/minute cubic yard (yd3) x 0.764 554 9 = cubic meter (m3) cubic yard (yd3) x 27 = cubic foot (ft3 or cf) cycles/second x 1.0 = hertz Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit darcy x 0.9869E-12 = meter square day (mean solar) x 86,400 = second (s) decanewton/meter (daN/m) x 0.685 068 = pounds per feet (lbs/ft) degree (angle) x 0.0111 = quadrant degree (angle) x 0.017 453 29 = radian degree (angle) x 3,600 = second (s) degree (angle) x 17.777 777 8 = mil degree/second x 0.166 67 = revolutions/minute (RPM) degree/second x 0.017 45 = radians/second demi (wine) x 475 = milliliter (mL) drink x 0.5 = fluid ounces (US) of alcohol drink x 15 = milliliters of alcohol dyne x 1.0E-05 = joule/meter (newton) dyne/square centimeter x 1.0E-06 = bar Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit em (pica) x 0.42 = centimeter (cm) erg x 1.0E-07 = joule (J) erg x 2.78E-14 = kilowatt-hour (kW.h) erg/second x 1.3E-10 = horsepower (hp) erg/second x 1.0E-10 = kilowatt Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit fathom (fath) x 1.828 8 = meter (m) foot (ft) x 30.48 = centimeter (cm) foot (ft) x 12 = inch (in) foot (ft) x 0.3048 = meter (m) foot (ft) x 1.645E-04 = mile (nautical) foot (ft) x 5280 = mile (statute) football field (USA) x 1.3223 = acre football field (USA) x 0.535 = hectare (ha) foot of water x 0.029 499 = atmosphere of water foot of water x 0.882 6 = inch of mercury foot of water x 0.433 515 = pound/square inch foot/minute x 0.508 0 = centimeter/second foot/second x 1.097 28 = kilometer/hour foot/second x 0.592 48 = knot foot/second x 0.681 818 = mile/hour foot-candles x 10.763 91 = candela-meter foot-candles x 10.763 91 = lumen/square meter foot-candles x 10.763 91 = lux foot-candles x 1.5759E-06 = watt/square centimeter (W/cm2) foot-pound (ft-lb) x 3.77E-07 = kilowatt-hour (kW.h) foot-pound (ft-lb) x 0.138 255 = kilogram-meter (kg.m) foot-pound (ft-lb) x 1.355 818 2 = newton-meter (N.m) foot-pound/minute x 2.26E-05 = kilowatt (kW) foot-pound/sec x 0.001 81 = horsepower freight ton (US) x 40.0 = cubic foot furlong x 1/8 = mile (statute) furlong x 200 = yard (yd) furlong/fortnight x 1 = snail's pace (you figure it out) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit gallon, US (gal) x 231 = cubic inch (in3) gallon, US (gal) x 0.031 75 = barrel gallon, US (gal) x 0.023 81 = barrel of crude oil gallon, US (gal) x 3,785.41 = cubic centimeter (cm3) gallon, US (gal) x 0.133 7 = cubic foot (ft3 or cf) gallon, US (gal) x 3.785412E-03 = cubic meter (m3) gallon, US (gal) x 0.832 675 = gallon, imperial gallon, US (gal) x 3.785 412 = liter (L) gallon, liquid British imperial x 4.546 09 = liter (L) gallon, liquid British imperial x 1.201 4 = gallon, US liquid gallon of crude oil x 0.023 809 52 = barrel of crude oil gallon/minute, US x 8.020 8 = cubic foot/hour gallon/minute, US x 0.134 = cubic foot/minute gallon/minute, US x 6.309E-05 = cubic meter/sec gallon/minute, US x 0.06309 = liter/sec gallon/minute, US x 227.1247 = liter/hour gallon/minute, US x 5450.993 = liter/day gauss x 1.0E-04 = weber/square meter girafa (beer, Portugal) x 1.0 = liter (L) googol x 10E+100 = 1 followed by 100 zeros grain x 0.064798 91 = gram (g) grain x 437.5 = ounce gram (g) x 0.0353 = ounce gram (g) x 2.204623E-03 = pound (lb) gram/centimeter x 5.6E-03 = pound/inch gram/cubic centimeter x 62.43 = pound/cubic foot gram/cubic centimeter x 8.347 = pound/gallon gram/liter x 1,000 = parts/million gram/liter x 8.34 = pound/1,000 gallon gram/liter x 0.062 43 = pound/cubic foot gram/square centimeter x 2.048 16 = pound/square foot gram-calorie x 1.56E-06 = horsepower-hour gram-calorie x 1.16E-06 = kilowatt-hour (kW.h) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit hectare (ha) x 2.471 = acre hectare (ha) x 107,600 = square foot (ft2) hectare (ha) x 10,000 = square meter (m2) hectare (ha) x 0.003 861 = square mile (sq.mi) horsepower (hp) x 1.014 = horsepower (metric) horsepower (hp) x 42.44 = british thermal unit/minute horsepower (hp) x 550 = foot-pound/second horsepower-hour (hp-hr) x 2.684520E+6 = joule (J) horsepower (hp) x 0.746 043 = kilowatt (kW) horsepower (hp), electrical x 746 = watt (W) horsepower (metric) x 0.986 = horsepower horsepower (metric) x 542.5 = foot-pound/second hundredweight (cwt) (UK) x 112 = pound hundredweight (cwt) (UK) x 50.802 345 = kilogram (kg) hundredweight (cwt) (US) x 100 = pound hundredweight (cwt) (US) x 45.359 237 = kilogram (kg) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit ice (1 pound, melting) x 151 = kilojoule (kJ) imperial (beer, Portugal) x 0.2 = liter (L), aka 'fino' in Portugal inch (in) x 2.54 = centimeter (cm) inch (in) x 0.025 4 = meter (m) inch (in) x 1.578E-05 = mile (mi) inch-pound x 0.112 985 = joule (J) inch of mercury x 0.4912 = pound/square inch inch of mercury x 3386.4 = pascal (Pa) inch of water at (4 oC) x 2.458E-03 = atmosphere inch of water at (4 oC) x 0.03 = pound/square inch iron (leather) x 1/48 = inch (in) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit jeroboam x 3 = liter (L), (aka 'double magnum') joule (J) x 9.48E-04 = british thermal unit (BTU) joule (J) x 0.737 563 = foot-pound (ft-lb) joule (J) x 0.000 239 = kilocalorie (kcal (IT)) joule (J) x 1.00 = newton-meter (N.m) joule (J) x 2.778E-04 = watt-hour (W.h) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit kilogram (kg) x 2.204 623 = pound (lb) kilogram (kg) x 9.84E-04 = ton, long kilogram (kg) x 1.1E-03 = ton, metric (t) kilogram (kg) x 35.273 962 = ounce (oz) kilogram/cubic meter x 0,062 428 = pound/cubic foot kilogram/meter x 0.67197 = pound/foot kilogram/meter x 0.980 855 9 = decanewton/meter (daN/m) kilogram/meter second x 10 = poise kilogram/square centimeter x 0.967 8 = atmosphere kilogram/square centimeter x 14.223 = pound/square inch kilogram/square meter x 9.81E-05 = bar kilogram-meter x 2.72E-06 = kilowatt-hour (kW.h) kilometer (km) x 3,280.84 = foot (ft) kilometer (km) x 0.621 4 = mile (mi) kilometer/hour x 0.911 34 = foot/second kilometer/hour x 0.539 95 = knot (kn) kilometer/hour x 0.621 37 = mile/hour kilopascal (kPa) x 0.009 869 = atmosphere kilopascal (kPa) x 0.010 000 = bar kilopascal (kPa) x 0.145 038 = pound/square inch kilopascal (kPa) x 0.010 197 = kilogram/sq. centimeter (kg/cm2) kilopascal (kPa) x 7.500 617 = millimeter of mercury (mmHg) kilowatt (kW) x 1.341 = horsepower (hp) kilowatt (kW) x 1,000 = watt (W) kilowatt-hour (kW.h) x 3,413 = british thermal unit (BTU) kilowatt-hour (kW.h) x 859.8 = kilocalorie kilowatt-hour (kW.h) x 3.6 = megajoule (MJ) kip (kilopound) x 1,000 = pound kip (kilopound) x 453.6 = kilogram (kg) knot (kn) x 0.515 = meter/second (m/s) knot (kn) x 1.0 = mile (nautical)/h knot (kn) x 1.152 = mile (statute)/h knot (kn) x 1852 = kilometer/hour (km/h) knot (kn) x 1.152 = mile (statute)/h Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit lambda x 1.0 = cubic milliliter (mm3) liter (L) x 0.006 3 = barrel of oil liter (L) x 0.008 4 = barrel liter (L) x 0.035 315 = cubic foot (ft3 or cf) liter (L) x 61.02 = cubic inch (in3) liter (L) x 0.2642 = gallon (US) liter (L) x 0.219 = gallon (UK) liter (L) x 1.056 = quart (US) liter (L) x 2.1134 = pint (US) liter (L) x 33.814 = ounce, fluid (fl oz) (US) liter/sec (L/s) x 2.12 = cubic foot/min (ft3/min) liter/100 km x 2.12 = cubic foot/min (ft3/min) long ton x 1,016.047 = kilogram (kg) long ton x 1.016 047 = metric ton (t) long ton x 2,240 = pound (lb) long ton x 1.12 = short ton (st) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit magnum x 1.500 = liter (L) marathon x 42 195 = meter marathon x 26 miles 385 yards = (Imperial units) measurement ton (US) x 40.00 = cubic foot melchior (champagne) x 18 = liter (L) meter (m) x 3.281 = foot (ft) meter (m) x 0.546 807 = fathom (fath) meter (m) x 39.370 079 = inch (in) meter (m) x 6.21E-04 = mile (statute) meter/second x 2.237 = mile (statute)/hour meter/second x 196.8 = foot/minute meter/second x 3.6 = kilometer/hour (km/h) meter/second x 1.942 = knot (kn) meter per square second(m/s2) x 3.280 839 9 = foot per square second (ft/s2) methuselah (champagne) x 6 = liter (L), aka 'imperial' metric carat x 200 = milligram (mg) metric grain x 50 = milligram (mg) metric mile (athletics) x 1500 = meter (m) metric ton (t) x 1,000 = kilogram (kg) metric ton (t) x 2,204.62 = pound (lb) metric ton (t) x 1.1023 = short ton (st) metric ton of crude oil x 7.33 = barrel (bbl) micrometer (µm) x 1.0E-06 = meter (m) mils (angle) x 0.056 25 = degree (angle) mil (mili-inch) x 0.001 = inch (in) mil (mili-inch) x 25.4 = micrometer (µm) mile, nautical x 1,852 = meter (m) mile, statute x 161,000 = centimeter (cm) mile, statute x 5,280 = foot (ft) mile, statute x 1.609 347 = kilometer (km) mile, statute x 1,609 = meter (m) mile, statute x 0.868 975 = mile, nautical miles/gallon (US) (mpg) x 0.4251 = kilometer/liter (km/L) mile/hour x 44.70 = centimeter/second mile/hour x 1.466 7 = foot/second meter (m) x 3.281 = foot meter (m) x 6.21E-04 = mile (statute) millibar (mb) x 1,0 = hectopascal (hPa) millibar (mb) x 100 = pascal (Pa) milliliter (mL) x 0.0338 = ounce, fluid (fl oz) millimeter (mm) x 0.039 37 = inch millimeter of mercury (mmHg) x 1 = torr millimeter of water x 9.81 = pascal (Pa) milligram/liter x 1 = parts/million million gallon/day x 1.547 2 = cubic foot/second minute (angle) x 0.016 7 = degree Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit nautical mile (nmi, NM) x 1,852 = meter (m) nebuchadnezzar (wine) x 15 = liter (L) newton (N) x 0.101 972 = kg (force) newton (N) x 0.224 81 = pound force newton (N) x 100,000 = dyne newton-meter (N.m, N·m) x 0.737 562 = pound-foot (lb-ft) newton-meter (N.m, N·m) x 0.101 971 6 = kilogram-meter (kg.m) newton-meter (N.m, N·m) x 8.850 747 5 = inch-pound (in-lb) newton.second/square meter x 10 = poise normal cubic meter (Nm3) x 1.0 = 1 m3 of gas @ 0 °C (32 °F) and 1 atm. normal cubic meter (Nm3) x 37.326 = standard cubic feet (SCF) @ 60 °F and 1 atm. nose x 0,5 = length of a horse's head Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit olympiad x 4 = years ounce (oz) x 28.34 = gram (g) ounce (oz) x 0.0625 = pound (lb) ounce, fluid (fl oz) x 1.8 = cubic inch ounce, fluid (fl oz) x 0.029 57 = liter (L) ounce, fluid (fl oz) x 29.573 53 = milliliter (mL) ounce, troy (oz) x 31.103 5 = gram (g) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit pascal x 1 = newton/sq meter pascal x 9.871E-06 = atmosphere pascal x 0.01 = millibar (mb) pascal second (Pa·s) x 10 = poise parts/million x 8.34 = pound/million gallon (gal) pat of butter (USA) x 9.45 = gram pat of butter (USA) x 0.333 333 = ounce pferdestärke (ps) x 735.499 = watt (W) pint, US liquid x 0.125 = gallon, US (gal) pint, US liquid x 16 = fluid ounce (US) pint, US liquid x 0.473 1 = liter (L) pipa (Portugal) x 500 = liter (L) poise (P) x 1 = gram/centimeter second poundal x 13,826 = dyne pound (lb) x 4.45E+05 = dyne pound (lb) x 453.59 = gram (g) pound (lb) x 4.5359E-04 = ton (metric) pound (lb) x 4.448 = joule/meter (newton) pound (lb) x 0.45359237 = kilogram (kg) pound (lb) x 16 = ounce (oz) pound of water x 27.68 = cubic inch (in3) pound of water x 0.119 83 = gallon (gal) pound/barrel x 2.853 = kg/m3 pound/barrel x 2.38 = pounds/100 gallons (US) pounds/100 gallons (US) x 1.2 = kg/m3 pound/cubic foot x 0.133 7 = pound/gallon (US) pound/cubic foot x 0.006 944 = pound/sq inch/foot (psi/ft) pound/cubic foot x 0.016 026 = gram/cubic centimeter pound/cubic foot x 16.018 5 = kilogram/cubic meter pound/cubic inch x 27.68 = gram/cubic centimeter pound/cubic inch x 27,680 = kilogram/cubic meter pound-foot x 1.488 2 = kilogram-meter pound-inch x 178.60 = gram-centimeter pound/gallon (ppg) x 0.120 05 = specific gravity pound/gallon (ppg) x 0.052 = pound/sq inch/foot (psi/ft) pound/gallon (ppg) x 7.48 = pound/cubic foot pound/gallon (ppg) x 0.119 8 = gram/cubic centimeter pound/gallon (UK) x 99 776.3712192 = milligram/liter pound/gallon (UK) x 99 890.3461041 = part/million (ppm) pound/gallon (UK) x 0.832 674 127 478 = pound/gallon (US) pound/gallon (US) x 119 826.433 807 = milligram/liter pound/gallon (US) x 119 963.311 946 = part/million (ppm) pound/gallon (US) x 1.200 950 007 93 = pound/gallon (UK) pound/square inch x 0.068 046 = atmosphere pound/square inch x 0.068947 = bar pound/square inch x 2.309 5 = foot of water pound/square inch x 2.036 02 = inch of mercury pound/square inch x 51.71475 = millimeter of mercury (mmHg) pound/square inch x 0.070 307 = kilogram/square centimeter pound/square inch x 703.069 6 = kilogram/square meter pound/square inch x 6.894757E+03 = pascal pound/square inch x 144 = pound/square foot pound/sq inch/foot (psi/ft) x 19.23 = pound/gallon (US) pound/sq inch/foot (psi/ft) x 144 = pound/cubic foot pound/sq inch/foot (psi/ft) x 2.309 5 = specific gravity Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit Q unit x 1.0E+18 = british thermal unit (btu) quadrant, angle x 90 = degree quadrant, angle x 1.570 8 = radian quart (gallon) x 0.946 = liter (L) quart (gallon) x 32 = ounce (fluid) quart, liquid x 57.75 = cubic inch (in3) quart, liquid x 9.46E-04 = cubic meter (m3) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit radian x 57.29 = degree radian x 3,438 = minutes radian x 206,000 = second revolution x 360 = degree revolution x 4 = quadrant revolution x 6.283 185 = radian rods x 5.5 = yard (yd) round (boxing) x 3 = minute Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit salmanazar (wine) x 9 = liter (L) second-foot x 1.0 = cubic foot/min (ft3/min) second (angle) x 2.78E-04 = degree second (angle) x 4.848137E-06 = radian short ton (st) x 0.892 9 = long ton short ton (st) x 0.907 184 7 = metric ton (t) short ton (st) x 2,000 = pound (lb) short ton of crude oil x 6.65 = barrel (bbl) specific gravity x 1 = gram/cubic centimeter specific gravity x 0.433 = pound/sq inch/foot (psi/ft) specific gravity x 8.33 = pound/gallon (US) specific gravity x 350.5 = pound/barrel specific gravity x 62.4 = pound/cubic foot square centimeter (cm2) x 1.08E-03 = square foot (ft2) square centimeter (cm2) x 0.155 0 = square inch (in2) square inch (in2) x 6.451 6 = square centimeter square foot (ft2) x 2.2956E-05 = acre square foot (ft2) x 929.03 = square centimeter (cm2) square foot (ft2) x 144 = square inch (in2) square foot (ft2) x 0.092 903 04 = square meter (m2) square foot (ft2) x 3.59E-08 = square mile (mi2) square foot (ft2), US Survey x 1.000004 = square foot (ft2) square foot (ft2), US Survey x 0.092 903 = square meter (m2) square kilometer (km2) x 247.105 = acre square kilometer (km2) x 100 = hectare square kilometer (km2) x 0.386 1 = square mile (mi2) square meter (m2) x 2.471E-04 = acre square meter (m2) x 10.763 915 = square foot (ft2) square meter (m2) x 10.763 867 = square foot (ft2) (US Servey) square meter (m2) x 3.86E-07 = square mile (mi2) square meter (m2) x 1,195 99 = square yard (yd2) square mile (mi2) x 640 = acre square mile (mi2) x 27,900,000 = square foot (ft2) square mile (mi2) x 2.589 988 = square kilometer (km2) square yard (yd2) x 9.0 = square foot (ft2) square yard (yd2) x 0.836 127 = square meter (m2) stack x 108 = cubic foot (ft3 or cf) standard cubic meter (Sm3) x 1 = 1 m3 of gas @ 60 °F and 1 atm. stone (UK only) x 14 = pounds Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit therm x 100,000 = BTU of natural gas therm x 1.054804E+08 = joule (J) toc (tons of coal equivalent) x 29.308 = gigajoule (GJ) toc (tons of coal equivalent) x 8.141 = megawatt-hour (MW.h) toe (tons of oil equivalent) x 42.244 = gigajoule (GJ) toe (tons of oil equivalent) x 11.63 = megawatt-hour (MW.h) tonne x 1.0 = ton, metric ton (air conditioning) x 12,000 = british thermal unit/hour (BTU/h) ton, gross (shipping) x 100 = cubic foof (of enclosed space) ton, long x 1,016.047 = kilogram (kg) ton, long x 1.016 047 = metric ton (t) ton, long x 2,240 = pound (lb) ton, long x 1.12 = short ton (st) ton, maritime, shipping, or measurement (UK) x 42 = cubic foot (ft3 or cf) ton, maritime, shipping, or measurement (USA) x 40 = cubic foot (ft3 or cf) ton, metric (t) x 7.33 = barrel of crude oil ton, metric (t) x 1,000 = kilogram (kg) ton, metric (t) x 2,204.62 = pound (lb) ton, short (st) x 6.65 = barrel of crude oil ton, short (st) x 0.892 9 = long ton ton, short (st) x 0.907 184 7 = metric ton (t) ton, short (st) x 2,000 = pound (lb) ton, register x 100 = cubic foot (ft3 or cf) ton, register (RT) x 2.832 = cubic meter (m3) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit unit call (UC) x 100 = call-second/h unit case (soft drinks) x 6.0 = quart (US) unit of blood x 450 = milliliter (mL) unit of heroin x 700 = gram Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit volumetric unit (vu) x 200 = cubic foot (of wood chips) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit watch x 4.0 = hour water (1 quart, boiling) x 3.0 = megajoule (MJ) watt (W) x 3.412 19 = british thermal unit/hour watt (W) x 0.001 341 = horsepower (hp) watt (absolute) x 1 = joule/second watt-hour (W.h) x 3.412 19 = british thermal unit (BTU) watt-hour (W.h) x 2,656 = foot-pound watt-hour (W.h) x 3.60 = kilojoule (kJ) weeks x 168 = hour whole note (music) x 1 = semibreve word x 5.0 = character (including spaces) word x 0.1 = line (60 character) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit X unit (Siegbahn unit) x 1.0021E-13 = meter (m) Return to top of page Original Unit Multiplied By Conversion Factor Equals Final Unit yard (yd) x 3.0 = foot (ft) yard (yd) x 36 = inch (in) yard (yd) x 0.914 40 = meter (m) yard (yd) x 1760 = mile (statute) years (mean of 4-year period) x 365.25 = day years (mean of 4-year period) x 8,766 = hour years (mean of 4-year period) x 526,000 = minute (time) years (mean of 4-year period) x 31,558,150 = second (time) years (mean of 4-year period) x 52.17 = week Return to top of page

### Prefixes of the International System of Units (SI)

 Numerical Value Prefix Symbol Meaning Exponential Expression 1 000 000 000 000 000 000 exa E Quintillion 1018 1 000 000 000 000 000 peta P Quadrillion 1015 1 000 000 000 000 tera T Trillion 1012 1 000 000 000 giga G Billion 109 1 000 000 mega M Million 106 1 000 kilo k Thousand 103 100 hecto h Hundred 102 10 deca / deka da Ten 101 1 100 0.1 deci d one-tenth 10-1 0.01 centi c one-hundredth 10-2 0.001 milli m one-thousandth 10-3 0.000 001 micro µ one-millionth 10-6 0.000 000 001 nano n one-billionth 10-9 0.000 000 000 001 pico p one-trillionth 10-12 0.000 000 000 000 001 femto f one-quadrillionth 10-15 0.000 000 000 000 000 001 atto a one-quintillionth 10-18 Return to top of page

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