**Definitions:**

**Pound Per Square Foot** (abbreviations: **psf, or lb/ft2**): is a British (Imperial) and American pressure unit which is directly related to the psi pressure unit by a factor of 144 (1 sq ft = 12 in x 12 in = 144 sq in). Where, 1 pound per square foot equals 47.8803 pascals.

**Kilopound Per Square Inch** (abbreviations: **ksi, or kips/in2**): is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one kilopound-force applied to an area of one square inch.

## How to Convert Pounds Per Square Feet to Kilopounds Per Square Inches

*Example: How many kilopounds per square inches are equivalent to 12.19 pounds per square feet?*

As;

1 pounds per square feet = 6.94444E-6 kilopounds per square inches

12.19 pounds per square feet = Y kilopounds per square inches

Assuming Y is the answer, and by criss-cross principle;

Y equals 12.19 times 6.94444E-6 over 1

(i.e.) Y = 12.19 * 6.94444E-6 / 1 = 8.46527236E-5 kilopounds per square inches

Answer is: 8.46527236E-5 kilopounds per square inches are equivalent to 12.19 pounds per square feet.

*Practice Question: Convert the following units into ksi:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 24.99 psf

( ii ) 5.49 psf

( iii ) 75.28 psf