Convert Pounds per Cubic Foot to Pounds per Cubic Inch

What are pounds per cubic foot and pounds per cubic inch?

Pounds per cubic foot is the imperial density unit used in US construction; water is about 62.4 lb/ft³. Pounds per cubic inch is a dense-material unit used for metals and machined parts. For reference: water is 1,000 kg/m³ (1 g/cm³), and steel is about 7,850 kg/m³.

How to convert pounds per cubic foot to pounds per cubic inch

1 lb/ft³ = 0.000578704 lb/in³. To convert, multiply the number of pounds per cubic foot by 0.000578704. For example, 5 lb/ft³ = 0.00289352 lb/in³, and 20 lb/ft³ = 0.0115741 lb/in³. To go the other way, multiply pounds per cubic inch by 1,728 (since 1 lb/in³ = 1,728 lb/ft³).

Pounds per Cubic Foot to Pounds per Cubic Inch conversion table

FAQ

What is 1 lb/ft³ in lb/in³?

1 lb/ft³ = 0.000578704 lb/in³. To convert any amount, multiply the number of pounds per cubic foot by 0.000578704.

How do I convert pounds per cubic inch back to pounds per cubic foot?

Go the other way: 1 lb/in³ = 1,728 lb/ft³, so multiply pounds per cubic inch by 1,728 to get pounds per cubic foot.

Is a pounds per cubic foot bigger than a pounds per cubic inch?

No — 1 lb/ft³ is the smaller unit, equal to 0.000578704 lb/in³ (it takes 1,728 lb/ft³ to make one lb/in³).

Are these density conversions exact?

They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.