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APPROXIMATE CONVERSIONS TO SI UNITS
| Symbol |
When You Know |
Multiply By |
To Find |
Symbol |
| LENGTH |
| 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 |
| in 2 |
square inches |
645.2 |
square millimeters |
mm 2 |
| ft 2 |
square feet |
0.093 |
square meters |
m 2 |
| yd 2 |
square yards |
0.836 |
square meters |
m 2 |
| Ac |
acres |
0.405 |
hectares |
ha |
| mi 2 |
square miles |
2.59 |
square kilometers |
km 2 |
| VOLUME |
| fl oz |
fluid ounces |
29.57 |
milliliters |
ml |
| Gal |
gallons |
3.785 |
liters |
l |
| ft 3 3 |
cubic feet |
0.028 |
cubic meters |
m 3 |
| yd 3 |
cubic yards |
0.765 |
cubic meters |
m 3 |
| MASS |
| Oz |
ounces |
28.35 |
grams |
g |
| Lb |
pounds |
0.454 |
kilograms |
kg |
| T |
short tons (2000 lbs) |
0.907 |
megagrams |
Mg |
| TEMPERATURE (exact) |
| F |
Fahrenheit |
5(F-32)/9 |
Celsius |
C |
| |
temperature |
or (F-32)/1.8 |
temperature |
|
| ILLUMINATION |
| Fc |
foot-candles |
10.76 |
lux |
lx |
| Fl |
foot-Lamberts |
3.426 |
candela/m2 |
cd/m2 |
| FORCE and PRESSURE or STRESS |
| Lbf |
pound-force |
4.45 |
newtons |
N |
| Psi |
pound-force per square inch |
6.89 |
kilopascals |
kPa |
APPROXIMATE CONVERSIONS FROM SI UNITS
| 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 |
| mm 2 |
square millimeters |
0.0016 |
square inches |
in2 |
| m 2 |
square meters |
10.764 |
square feet |
ft 2 |
| m 2 |
square meters |
1.195 |
square yards |
yd 2 |
| ha |
hectares |
2.47 |
acres |
ac |
| km 2 |
square kilometers |
0.386 |
square miles |
mi 2 |
| VOLUME |
| ml |
milliliters |
0.034 |
fluid ounces |
fl oz |
| l |
liters |
0.264 |
gallons |
gal |
| m 3 |
cubic meters |
35.71 |
cubic feet |
ft 3 |
| m 3 |
cubic meters |
1.307 |
cubic yards |
yd 3 |
| MASS |
| g |
grams |
0.035 |
ounces |
oz |
| kg |
kilograms |
2.202 |
pounds |
lb |
| Mg |
megagrams |
1.103 |
short tons (2000 lbs) |
T |
| TEMPERATURE (exact) |
| C |
Celsius |
1.8 C + 32 |
Fahrenheit |
F |
| |
temperature |
|
temperature |
|
| ILLUMINATION |
| lx |
lux |
0.0929 |
foot-candles |
fc |
| cd/m2 |
candela/m2 |
0.2919 |
foot-Lamberts |
fl |
| FORCE and PRESSURE or STRESS |
| N |
newtons |
0.225 |
pound-force |
lbf |
| kPa |
kilopascals |
0.145 |
pound-force per square inch |
psi |
* SI is the symbol for the International System of Units. Appropriate rounding should be made to comply with Section 4 of ASTM E380.
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