T M 5 5 - 2 4 2 0 - 2 2 4 - 14
APPENDIX A
CONVERSION TABLES
1.
2 .
3.
4.
5.
6 .
Common Metric Abbreviations
m = meter
kg = kilogram
dm = decimeter
km = kilometer
cm = centimeter
t
mm = millimeter
Linear Measure
1 mi= 1,609.35 m
1
1 yd = 0.9144 m
1
1 ft = 0.3048 m
1
1 in. = 0.0254 m
1
1 m= 10 dm = 100 cm = 1,000 mm
Surface Measure
1 sq yd = 0.8361 sq m
1
1 sq ft = 0.0929 sq m
1
1 sq in. = 0.00065 sq m
1
Cubic Measure
1 cu yd = 0.76455 cu m
1
1 cu ft = 0.02831 cu m
1
1 cu in. = 0.000016 cu m
1
Weight
1 STON = 907.185 kg
1
1 lb = 0.45359 kg
1
1 kg = 2.2046 lb
The following simplified conversion factors are
accurate to within 2 percent for quick computa-
tions:
a. Inches to centimeters. Multiply in. by 10 and
divide by 4.
b. Yards to meters. Multiply yd by 9 and divide
by 10.
c. Miles to kilometers. Multiply mi by 8 and
divide by 5.
d. Pounds to kilograms. Multiply lb by 5 and
divide by 11.
Paragraph 7-37, FM 55-15 and paragraph 2-15,
TM 55–450-15 contain additional detailed conver-
sion factors.
7. The following conversions are provided for
guidance when procuring lumber, wire rope, or
wire in areas that use the metric system. Lumber
sizes are rounded off to nearest 1/2 cm.
a. Lumber.
(1) 2-in. x 4-in. x desired length = 5-cm x
10-cm x desired length.
= metric tons
km = 0.6214 mi
m = 1.0936 yd
m = 3.2808 ft
m = 39.3700 in.
sq m = 1.196 sq yd
sq m = 10.764 sq ft
sq m = 1,550 sq in.
cu m = 1.31 cu yd
cu m = 35.30 cu ft
cu m = 61,023 cu in.
MT = 1,000 kg
MT = 2,204.62 lb
(2) 1-in. x 6-in. x desired length = 2.5-cm x
15-cm x desired length.
(3) 6-in. x 8-in. x desired length = 15-cm x
20-cm x desired length.
(4) 1-in. x 12-in. x desired length = 2.5-cm x
30-cm x desired length (length normally expressed
in ft or m).
b. Wire rope.
(1) 3/8-in. dia = 9.5-mm dia
(2) 1/2-in. dia = 12.7-mm dia
(3) 5/8-in. dia = 15.8-mm dia
(4) 3/4-in. dia = 19.0-mm dia
(5) 7/8-in. dia = 22.2-mm dia
(6) 1-in. dia = 25.4-mm dia
(7) 1-1/4-in. dia = 31.7-mm dia
(8) 1-1/2-in. dia = 38.1-mm dia
Round off to next higher whole mm of available
wire rope sizes.
c. Wire. No. 8 gauge annealed (11/64-in. dia) =
4.37-mm dia. Round off as in b above.
A-1
