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| Railroad-Highway Grade Crossing Handbook - Revised Second Edition August 2007 | |
| SI* (Modern Metric) Conversion Factors | Table of Contents |
SI* (MODERN METRIC) CONVERSION FACTORS |
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APPROXIMATE CONVERSIONS TO SI UNITS |
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Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
LENGTH |
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in |
inches |
25.4 |
millimeters |
mm |
ft |
feet |
0.305 |
meters |
m |
yd |
yards |
0.914 |
meters |
m |
mi |
miles |
1.61 |
kilometers |
km |
AREA |
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i2 |
square inches |
645.2 |
square millimeters |
mm2 |
ft2 |
square feet |
0.093 |
square meters |
m2 |
yd2 |
square yard |
0.836 |
square meters |
m2 |
ac |
acres |
0.405 |
hectares |
ha |
mi2 |
square miles |
2.59 |
square kilometers |
km2 |
VOLUME |
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fl oz |
fluid ounces |
29.57 |
milliliters |
mL |
gal |
gallons |
3.785 |
liters |
L |
ft3 |
cubic feet |
0.028 |
cubic meters |
m3 |
yd3 |
cubic yards |
0.765 |
cubic meters |
m3 |
NOTE: volumes greater than 1000 L shall be shown in m3 |
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MASS |
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oz |
ounces |
28.35 |
grams |
g |
lb |
pounds |
0.454 |
kilograms |
kg |
T |
short tons (2000 lb) |
0.907 |
megagrams (or "metric ton") |
Mg (or "t") |
TEMPERATURE (exact degrees) |
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oF |
Fahrenheit |
5 (F-32)/9 or (F-32)/1.8 |
Celsius |
oC |
ILLUMINATION |
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fc |
foot-candles |
10.76 |
lux |
lx |
fl |
foot-Lamberts |
3.426 |
candela/m |
cd/m2 |
FORCE and PRESSURE or STRESS |
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lbf |
poundforce |
4.45 |
newtons |
N |
lbf/in2 |
poundforce per square |
inch 6.89 |
kilo pascals |
kPa |
APPROXIMATE CONVERSIONS FROM SI UNITS |
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Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
LENGTH |
||||
mm |
millimeters |
0.039 |
inches |
in |
m |
meters |
3.28 |
feet |
ft |
m |
meters |
1.09 |
yards |
yd |
km |
kilometers |
0.621 |
miles |
mi |
AREA |
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mm2 |
square millimeters |
0.0016 |
square inches |
i2 |
m2 |
square meters |
10.764 |
square feet |
ft2 |
m2 |
square meters |
1.195 |
square yards |
yd2 |
ha |
hectares |
2.47 |
acres |
ac |
km2 |
square kilometers |
0.386 |
square miles |
mi2 |
VOLUME |
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mL |
milliliters |
0.034 |
fluid ounces |
fl oz |
L |
liters |
0.264 |
gallons |
gal |
m3 |
cubic meters |
35.314 |
cubic feet |
ft3 |
m3 |
cubic meters |
1.307 |
cubic yards |
yd3 |
MASS |
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g |
grams |
0.035 |
ounces |
oz |
kg |
kilograms |
2.202 |
pounds |
lb |
Mg (or "t") |
megagrams (or "metric |
ton") 1.103 |
short tons (2000 lb) |
T |
TEMPERATURE (exact degrees) |
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Celsius |
1.8C+32 |
Fahrenheit |
oF |
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ILLUMINATION |
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lx |
lux |
0.0929 |
foot-candles |
fc |
cd/m2 |
candela/m |
0.2919 |
foot-Lamberts |
fl |
FORCE and PRESSURE or STRESS |
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N |
newtons |
0.225 |
poundforce |
lbf |
kPa |
kilopascals |
0.145 |
poundforce per square inch |
lbf/in2 |
| Table of Contents |
