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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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