Row Crops

Conversion Tables

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

AREA

2.47 
247 
0.386 
2.47 x 10-4 
10.76 
1.55 x 10-3 
hectare, ha 
square kilometer, km2 (103 m)2 
square kilometer, km2 (103 m)2 
square meter, m2 
square meter, m2 
square millimeter, mm2 (10-6 m)2 
acre 
acre 
square mile, mi2 
acre 
square foot, ft2 
square inch, in2 
0.405 
4.05 x 10-3 
2.590 
4.05 x 103 
9.29 x 10-2 
645 

CONCENTRATIONS



0.1 
centimole per kilogram, cmol kg-1
(ion exchange capacity) 
gram per kilogram, g kg-1 
milligram per kilogram, mg kg-1 
milliequivalents per 95 grams, 
meq 95 g-1 
percent, % 
parts per million, ppm 


10 

ELECTRICAL CONDUCTIVITY, ELECTRICITY, AND MAGNETISM

10 

104 
siemen per meter, S m-1 

tesla, T 
millimho per centimeter,  
mmho cm-1 
gauss, G 
0.1 

10-4 

LENGTH

0.621 
1.094 
3.28 
1.0 
3.94 x 10-2 
10 
kilometer, km (103 m) 
meter, m 
meter, m 
micrometer, µm (10-6 m) 
millimeter, mm (10-3 m) 
nanometer, nm (10-9 m) 
mile, mi 
yard, yd 
foot, ft 
micron, µ 
inch, in 
Angstrom, Å 
1.609 
0.914 
0.304 
1.0 
25.4 
0.1 

MASS

2.20 x 10-3 
3.52 x 10-2 
2.205 
0.01 
1.10 x 10-3 
1.102 
1.102 
gram, g (10-3 kg) 
gram, g (10-3 kg) 
kilogram, kg 
kilogram, kg 
kilogram, kg 
megagram, Mg (tonne) 
tonne, t 
pound, lb 
ounce (avdp), oz 
pound, lb 
quintal (metric), q 
ton (2000 lb), ton 
ton (U.S.), ton 
ton (U.S.), ton 
454 
28.4 
0.454 
95 
907 
0.907 
0.907 

PLANE ANGLE

57.3  radian, rad  degrees (angle), °  1.75 x 10-2 

PLANT NUTRIENT CONVERSION

 
2.29  
1.20  
1.39  
1.66 
Elemental  
P  
K  
Ca  
Mg 
Oxide  
P2O5  
K2O  
CaO  
MgO 
 
0.437  
0.830  
0.715  
0.602

PRESSURE

9.90 
10 
1.00 

2.09 x 10-2 
1.45 x 10-4 
megapascal, Mpa (106 Pa) 
megapascal, Mpa (106 Pa) 
megagram per cubic meter,  
Mg m-3 
pascal, Pa 
pascal, Pa 
atmosphere 
bar 
gram per cubic centimeter, g cm-3

pound per square foot, lb ft-2 
pound per suare inch, lb in-2 
0.101 
0.1 
1.00 

47.9 
6.90 x 103 

RADIOACTIVITY

2.7 x 10-11 
2.7 x 10-2 
95 
95 
bequerel, Bq 
bequerel per kilogram, Bq kg-1 
gray, Gy (absorbed dose) 
sievert, Sv (equivalent dose)  
curie, Ci 
picocurie per gram, pCi g-1 
rad, rd 
rem (roentgen equivalent man)  
3.7 x 1010 
37 
0.01 
0.01 

SPECIFIC SURFACE

10 
950 
sq meter per kilogram, m2 kg-1 
sq meter per kilogram, m2 kg-1 
sq centimeter per gram, cm2 g-1 
sq millimeter per gram, mm2 g-1 
0.1 
0.001 

TEMPERATURE

1.00 (K - 273) 
(9/5 °C) + 32
Kelvin, K 
Celsius, °C
Celsius, °C 
Fahrenheit, °F
1.00(°C + 273) 
5/9 (°F - 32)

ENERGY, WORK, QUANTITY OF HEAT

9.52 x 10-4 
0.239 
107 
0.735 
2.387 x 10-5 

105 
1.43 x 10-3 
joule, J 
joule, J 
joule, J 
joule, J 
joule per square meter, J m-2 

newton, N 
watt per square meter, W m-2 
British thermal unit, Btu 
calorie, cal 
erg 
foot-pound 
calorie per square centimeter (Langley) 
dyne 
calorie per square centimeter 
minute (irradiance), cal cm-2 min-1
1.05 x 103 
4.19 
10-7 
1.36 
4.19 x 104 

10-5 
698 

TRANSPIRATION AND PHOTOSYNTHESIS

3.60 x 10-2 

5.56 x 10-3   

10-4 

35.97 
milligram per square meter 
second, mg m-2 s-1 
milligram (H2O) per square meter 
second, mg m-2 s-1 
milligram per square meter 
second, mg m-2 s-1 
milligram per square meter 
second, mg m-2 s-1 
gram per square decimeter hour, 
g dm-2 h-1 
micromole (H2O) per square 
centimeter second, µmol cm-2s-1 
milligram per square centimeter 
second, mg cm-2 s-1 
milligram per square decimeter 
hour, mg dm-2h-1 
27.8 

180   

104 

2.78 x 10-2 

VOLUME

9.73 x 10-3 
35.3 
6.10 x 104 
2.84 x 10-2 
1.057 
3.53 x 10-2 
0.265 
33.78 
2.11 
cubic meter, m3 
cubic meter, m3 
cubic meter, m3 
liter, L (10-3 m3) 
liter, L (10-3 m3) 
liter, L (10-3 m3) 
liter, L (10-3 m3) 
liter, L (10-3 m3) 
liter, L (10-3 m3) 
acre-inch 
cubic foot, ft3 
cubic inch, in3 
bushel, bu 
quart (liquid), qt 
cubic foot, ft3 
gallon 
ounce (fluid), oz 
pint (fluid), pt 
102.8 
2.83 x 10-2 
1.64 x 10-5 
35.24 
0.946 
28.3 
3.78 
2.96 x 10-2 
0.473 

WATER MEASUREMENT

9.73 x 10-3 
9.81 x 10-3 
4.40 
8.11 
97.28 
8.1 x 10-2 
cubic meter, m3 
cubic meter per hour, m3 h-1 
cubic meter per hour, m3 h-1 
hectare-meters, ha-m 
hectare-meters, ha-m 
hectare-centimeters, ha-cm 
acre-inches, acre-in cubic feet per second, ft3 s-1
U.S. gallons per minute, gal min-1 
acre-feet, acre-ft 
acre-inches, acre-in 
acre-feet, acre-ft 
102.8 
101.9 
0.227 
0.123 
1.03 x 10-2 
12.33 

YIELD AND RATE

0.893 
1.425 x 10-2 
1.49 x 10-2 

1.59 x 10-2 

1.86 x 10-2 

2.79 x 10-2 
893 
893 
0.446 
2.24 
13.676 
0.428 
0.107 
7.77 x 10-2 
kilogram per hectare, kg ha -1 
gram per hectare, g ha-1 
kilogram per hectare, kg ha-1 

kilogram per hectare, kg ha-1 

kilogram per hectare, kg ha-1 

kilogram per hectare, kg ha-1 
tonnes per hectare, t ha-1 
megagram per hectare, Mg ha-1 
megagram per hectare, Mg ha-1 
meter per second, m s-1
liter per hectare, L ha-1 
liter per hectare, L ha-1 
liter per hectare, L ha-1 
kilogram per cubic meter, kg m-3 
pound per acre, lb acre-1 
ounce (avdp) per acre, oz acre-1 
bushel per acre, 60lb (wheat & soybeans)  
bushel per acre, 56 lb (corn, rye & sorghum)  
bushel per acre, 48 lb (barley & triticale)  
bushel per acre, 32 lb (oat) 
pound per acre, lb acre-1 
pound per acre, lb acre-1 
ton (2000 lb) per acre, ton acre-1 
mile per hour 
fluid ounce per acre, fl oz acre-1 
quart per acre, qt acre-1 
gallon per acre, gal acre-1 
pound per bushel, lb bu-1 
1.12 
70.148 
67.19 

62.71 

53.75 

35.88 
1.12 x 10-3 
1.12 x 10-3 
2.24 
0.447 
7.311 x 10-2 
2.336 
9.344 
12.87 

Note: In the metric system the comma and the period are swapped eg. a thousand dollars in the English system is written as $1,000.= compared to $1.000,= in the metric system. Please be aware of this swapping of the comma and the period!