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TM 55-2410-237-14
APPENDIX A
CONVERSION TABLES
A-1. Common Metric Abbreviations
m = meter
dm = decimeter
cm = centimeter
mm = millimeter
.
A-2. Linear Measure
1 mi = 1,609.35 m
1 yd = 0.9144 m
1 ft = 0.3048 m
1 in. = 0.0254 m
kg = kilogram
km = kilometer
t = metric tons
1 m = 10 dm = 100 cm = 1000 mm
A-3. Surface Measure
1 yd2 = 0.8361 m2
1 ft2 = 0.0929 m2
1 in.2 = 0.00065 m2
A-4. Cubic Measure
1 yd3 = 0.76455 m3
1 ft3 = 0.02831 m3
1 in3 = 0.000016 m3
A-5. Weight
1 STON = 907.185 kg
1 lb = 0.45359
1 kg = 2.2046 lb
A-6. Simplified Conversion Factors
1 km x 0.6214 mi
1 m = 1.0936 yd
1 m = 3.2808 ft
1 m = 39.3700 in.
1 m2 = 1.196 yd2
1 m2 = 10.764 ft2
1 m2 = 1,550 in.2
1 m3 = 1.31 yd3
1 m3 = 35.30 ft3
1 m3 = 61,023 in.3
1 t = 1000 kg
1 t = 2,204.62 lb
The following simplified conversion factors are accurate to within 2 percent for quick computations:
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 contains additional detailed conversion factors.
A-7. Conversions for Lumber, Wire Rope, and Wire
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 ½ cm.
a. Lumber.
(1) 2-in. by 4-in. by desired length = 5-cm by 10-cm by desired length.
(2) 1-in. by 6-in. by desired length = 2.5-cm by 15-cm by desired length.
(3) 6-in. by 8-in. by desired length = 15-cm by 20-cm by desired length.
(4) 1-in. by 12-in. by desired length = 2.5-cm by 30-cm by desired length (length normally expressed in ft or
m).
b. Wire rope.
(1) 3/8-in. dia = 9.5-mm dia.
(2) ½-in. dia = 12.7-mm dia.
(3) 5/8-in. dia = 15.8-mm dia.
(4) ¾-in. dia = 19.0-mm dia.
(5) 7/8-in. dia = 22.2-mm dia.
A-1
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