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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-06-132
Date: December 2006

Long-Term Pavement Performance Program Manual for Falling Weight Deflectometer Measurements

Appendix C: Unit Conversions for Common Fwd-Related Measurements

Deflection
mils (inch * 10-3)microns (meter * 10-6)
16406
24610
802032
microns = mils * 25.4
 
Load
kips (pound * 103)kN (Newton * 103)kPa (Pascal * 103)(for 300 mm diameter plate)
6 (5.4 to 6.6)26.7 (24.0 to 29.4)378 (340 to 416)
9 (8.1 to 9.9)40.0 (36.0 to 44.0)566 (509 to 662)
12 (10.8 to 13.2)53.4 (48.1 to 58.7)755 (680 to 830)
16 (14.4 to 17.6)71.2 (64.1 to 78.3)1007 (907 to 1108)
kN = kip * 4.448 
 kPa = kN * 14.15
(for 300 mm-diameter (11.81-inch) plate only)
 
Temperature
FahrenheitCelsius
0-17.8
320
7021.1
10037.8
°C = (°F - 32) * 5/9
 
Distance
feetmeters
123.66
144.27
257.62
5015.2
10030.4
500152.4
1000304.8
meters = feet * 0.3048

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