Conversion Factors for SI 
and non-SI Units 
 Voltar

 
 
To convert Column 1 into Column 2, multiply by
Column 1 SI Unit
Column 2 
non-SI Unit
To convert Column 2 into Column 1, multiply by
Temperature
1.00(K - 273)
 Kelvin, K
 Celsius,  C
 1.00( C + 273)
(9/5  C) + 32
Celsius,  C
Fahrenheit,  F
5/9 ( F - 32)
Energy, Work, Quantity of Heat
 9.52 x 10-4
 joule, J
 British thermal unit, Btu
 1.05 x 103
0.239
joule, J
calorie, cal
4.19
107
joule, J
erg
10-7
0.735
joule, J
foot-pound
1.36
2.387 x 10-5
joule per square meter, J m-2
calorie per square centimeter (langley)
4.19 x 104
105
newton, N
dyne
10-5
1.43 x 10-3
watt per square meter, W m-2
calorie per square centimeter minute (irradiance), cal cm-2 min-1
698
Transpiration and Photosynthesis
 3.60 x 10-2
 milligram per square meter second, mg m-2 s-1
 gram per square decimeter hour,

g dm-2 h-1
 27.8
5.56 x 10-3
milligram (H2O) per square meter second, mg m-2 s-1
micromole (H2O) per square centimeter second, m mol cm-2 s-1
180
10-4
milligram per square meter second, mg m-2 s-1
milligram per square centimeter second, mg cm-2 s-1
104
35.97
milligram per square meter second, mg m-2 s-1
milligram per square decimeter hour,

mg dm-2 h-1
2.78 x 10-2
Plane Angle
 57.3
 radian, rad
 degrees (angle),
 1.75 x 10-2
Electrical Conductivity, Electricity, and Magnetism
 10
 siemen per meter, S m-1
 millimho per centimeter, mmho cm-1
 0.1
104
tesla, T
gauss, G
10-4
 Water Measurement
9.73 x 10-3
cubic meter, m3
acre-inches, acre-in
102.8
9.81 x 10-3
cubic meter per hour, m3 h-1
cubic feet per second, ft3 s-1
101.9
4.40
cubic meter per hour, m3 h-1
U.S. gallons per minute, gal min-1
0.227
8.11
hectare-meters, ha-m
acre-feet, acre-ft
0.123
97.28
hectare-meters, ha-m
acre-inches, acre-in
1.03 x 10-2
8.1 x 10-2
hectare-centimeters, ha-cm
acre-feet, acre-ft
12.33
 Concentrations
1
Centimole per Kilogram, cmol Kg-1 (ion exchange capacity)
milliequivalents per 100 grams, meq 100 g-1
1
0.1
gram per Kilogram, g Kg-1
percent, %
10
1
milligram per Kilogram, mg Kg-1
parts per million, ppm
1
 Radioactivity
2.7 x 10-11
bequerel, Bq
curie, Ci
3.7 x 1010
2.7 x 10-2
bequerel per Kilogram, Bq Kg-1
picocurie per gram, pCi g-1
37
100
gray, Gy (absorbed dose)
rad, rd
0.01
100
sievert, Sv (equivalent dose)
rem (roentgen equivalent man)
0.01
 Plant Nutrient Conversion
 
Elemental
Oxide
  
2.29
P
P2O5
0.437
1.20
K
K2O
0.830
1.39
Ca
CaO
0.715
1.66
Mg
MgO
0.602
Lenght
0.621
Kilometer, Km (103 m)
mile, mi
1.609
1.094
meter, m
yard, yd
0.914
3.28
meter, m
foot, ft
0.304
1.0
micrometer, m m (10-6 m)
micron, m
1.0
3.94 x 10-2
millimeter, mm (10-3 m)
inch, in
25.4
10
nanometer, nm (10-9 m)
Angstrom, A
0.1
 Area
2.47
hectare, ha
acre
0.405
247
square Kilometer, Km2 (103 m)2
acre
4.05 x 10-3
0.386
square Kilometer, Km2 (103 m)2
square mile, mi2
2.590
2.47 x 10-4
square meter, m2
acre
4.05 x 103
10.76
square meter, m2
square foot, ft2
9.29 x 10-2
1.55 x 10-3
square millimeter, mm2 (10-3 m)2
square inch, in2
645
Volume
9.73 x 10-3
cubic meter, m3
acre-inch
102.8
35.3
cubic meter, m3
cubic foot, ft3
2.83 x 10-2
6.10 x 104
cubic meter, m3
cubic inch, in3
1.64 x 10-5
2.84 x 10-2
liter, L (10-3 m3)
bushel, bu
35.24
1.057
liter, L (10-3 m3)
quart (liquid), qt
0.946
3.53 x 10-2
liter, L (10-3 m3)
cubic foot, ft3
28.3
0.265
liter, L (10-3 m3)
gallon
3.78
33.78
liter, L (10-3 m3)
ounce (fluid), oz
2.96 x 10-2
2.11
liter, L (10-3 m3)
pint (fluid), pt
0.473
 Mass
2.20 x 10-3
gram, g(10-3 Kg)
pound, lb
454
3.52 x 10-2
gram, g(10-3 Kg)
ounce (avdp), oz
28.4
2.205
Kilogram, Kg
pound, lb
0.454
0.01
Kilogram, Kg
quintal (metric), q
100
1.10 x 10-3
Kilogram, Kg
ton (2000 lb), ton
907
1.102
megagram, Mg (tonne)
ton (U.S.), ton
0.907
1.102
tonne, t
ton (U.S.), ton
0.907
 Yield and Rate
0.893
kilogram per hectare, Kg ha-1
pound per acre, lb acre-1
1.12
7.77 x 10-2
kilogram per cubic meter, Kg m-3
pound per bushel, bu-1
12.87
1.49 x 10-2
kilogram per hectare, Kg ha-1
bushel per acre, 60 lb
67.19
1.59 x 10-2
kilogram per hectare, Kg ha-1
bushel per acre, 56 lb
62.71
1.86 x 10-2
kilogram per hectare, Kg ha-1
bushel per acre, 48 lb
53.75
0.107
liter per hectare, L ha-1
gallon per acre
9.35
893
tonnes per hectare, t ha-1
pound per acre, lb acre-1
1.12 x 10-3
893
megagram per hectare, Mg ha-1
pound per acre, lb acre-1
1.12 x 10-3
0.446
megagram per hectare, Mg ha-1
ton (2000 lb) per acre, ton acre-1
2.24
2.24
meter per second, m s-1
mile per hour
0.447
 Specific Surface
10
square meter per Kilogram, m2 Kg-
square centimeter per gram, cm2 g-1
0.1
1000
square meter per Kilogram, m2 Kg-
square centimeter per gram, cm2 g-1
0.001
 Pressure
9.90
megapascal, Mpa (106 Pa)
atmosphere
0.101
10
megapascal, Mpa (106 Pa)
bar
0.1
1.00
megagram per cubic meter, Mg m-3
gram per cubic centimeter, g cm-3
1.00
2.09 x 10-2
pascal, Pa
pound per square foot, lb ft-2
47.9
1.45 x 10-4
pascal, Pa
pound per square inch, lb in-2
6.90 x 103

 
 
 
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