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SI Conversion Factors

 Note: E (exponent) followed by  + or -   and two digits indicate the power of 10. For example 3.523 907 E-02 is 3.523 907 times 10 to the power of -2  is 0.035 239 07.
To convert from to multiply by
abampere ampere(A) 1.000 000 E+01
abcoulomb coulomb(C) 1.000 000 E+01
abfarad farad(F) 1.000 000 E+09
abhenry henry(H) 1.000 000 E-09
abmho siemens(S) 1.000 000 E+09
abvolt volt(V) 1.000 000 E-08
acre-foot (U.S. survey) metre3 (m3) 1.233 489 E+03
acre (U.S. survey) metre3 (m3) 4.046 873 E+03
ampere-hour coulomb (C) 3.600 000 E+03
angstrom metre (m) 1.000 000 E-10
are metre2 (m2) 1.000 000 E+02
astronomical unit metre (m) 1.495 98 E+11
atmosphere (normal) pascal (Pa) 1.013 25 E+05
atmosphere (Technical=1kg/cm2) pascal (Pa) 9.806 650 E+04
bar pascal (Pa) 1.000 000 E+05
barn metre2 (m2) 1.000 000 E-28
barrel (for crude petroleum, 42gal) metre3 (m3) 1.589 873 E-01
board foot metre3 (m3) 2.359 737 E-03
British thermal unit (Internationl table) joule (J) 1.055 056 E+03
British thermal unit (mean) joule (J) 1.055 87 E+03
British thermal unit (thermochemical) joule (J) 1.054 350 E+03
British thermal unit (29 deg F ) joule (J) 1.059 67 E+03
British thermal unit (59 deg F ) joule (J) 1.054 80 E+03
British thermal unit (60 deg F ) joule (J) 1.054 68 E+03
  
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Btu (thermochemical)/ft2-sec watt/metre2 (W/m2) 1.134 893 E+04
Btu (thermochemical)/ft2-min watt/metre2 (W/m2) 1.891 489 E+02
Btu (thermochemical)/ft2-hour watt/metre2 (W/m2) 3.152 481 E+00
Btu (thermochemical)/inch2-sec watt/metre2 (W/m2) 1.634 246 E+06
Btu (thermochemical).in/s.ft2.F(k, thermal conductivity) watt/metre-kevin (W/m.K) 5.188 732 E+02
Btu (International Table).in/s.ft2.F(k, thermal conductivity) watt/metre-kevin (W/m.K) 5.192 204 E+02
Btu (thermochemical).in/h.ft2.F(k, thermal conductivity) watt/metre-kevin (W/m.K) 1.441 314 E-01
Btu (International Table).in/h.ft2.F(k, thermal conductivity) watt/metre-kevin (W/m.K) 1.442 279 E-01
Btu (International Table)/ft2 joule/metre2 (J/m2) 1.135 653 E-04
Btu (thermochemical)/ft2 joule/metre2 (J/m2) 1.134 893 E+04
Btu (International Table)/h.ft2.F(C, thermal conductance) watt/metre2-kevin (W/m2.K) 5.678 263 E+00
Btu (thermochemical)/h.ft2.F(C, thermal conductance) watt/metre2-kevin (W/m2.K) 5.674 466 E+00
Btu (International Table)/pound-mass joule/kilogram (J/kg) 2.326 000*E+03
Btu (thermochemical)/pound-mass joule/kilogram (J/kg) 2.324 444*E+03
Btu (International Table)/lbm.F(c, heat capacity) joule/kilogram-kevin (J/kg.K) 4.186 800*E+03