Measurement Units

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Civil engineers throughout the world accept both the United States Customary System (USCS) and the System International (SI) units of measure for both applied and theoretical calculations. However, the SI units are much more widely used than those of the USCS. Hence, both the USCS and the SI units are presented for essentially every formula in this website.

To permit even wider use of this text, this website contains
the conversion factors needed to switch from one system to the other.

Commonly Used USCS and SI Units *



USCS unit

SI unit


SI symbol


Conversion factor ( multiply USCS unit by this factor to
obtain SI unit)


Square foot


Square meter


M2


0.0929

Cubic foot

Cubic meter

M3

0.2831

Pound per square inch

Kilopascal

KPa

6.894

Pound force

Newton

Nu

4.448

Foot pound torque

Newton meter

N-m

1.356

Kip foot

Kilonewton meter

LN-m

1.355

Gallon per minute

Liter per second

L/s

0.06309


Kip per square inch


Megapascal

MPa


6.89

* These are the most common units which everyone should know.This website deals with a detailed discussion in next pages.

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