lb/ft³ to lb/in³ Converter

ConversionEdited by Hemant Kumar and Anjita Rai, founders · How we checkUpdated Free · No sign-up

Quick answer: To convert lb/ft³ to lb/in³, multiply by 0.0005787037. For example, 10 lb/ft³ is 0.005787037 lb/in³. One pound per cubic foot equals 0.0005787037 lb/in³.

Use the lb/ft³ to lb/in³ Converter

lb/ft³ to lb/in³ formula and what each symbol means

lb/in³ = lb/ft³ × 0.0005787037

Symbols used in the formula
SymbolMeaning
lb/ft³Pound per cubic foot
lb/in³Pound per cubic inch

lb/ft³ to lb/in³ examples

1 lb/ft³

1 lb/ft³ × 0.0005787037 = 0.0005787037 lb/in³.

10 lb/ft³

10 lb/ft³ × 0.0005787037 = 0.005787037 lb/in³.

100 lb/ft³

100 lb/ft³ × 0.0005787037 = 0.05787037 lb/in³.

lb/ft³ compared with lb/in³

One lb/in³ is 1,728 times as large as one lb/ft³, so your number gets smaller when you convert lb/ft³ to lb/in³ and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.

About lb/ft³ and lb/in³

Pound per cubic foot (lb/ft³): Imperial density unit, about 16.0185 kg/m³. Pound per cubic inch (lb/in³): About 27,679.9 kg/m³.

Where lb/ft³ to lb/in³ conversions are used

Engineering and shipping calculations convert between mass and volume with density. Lab work often reports g/cm³ or kg/L, which are numerically equal.

How to calculate lb/ft³ to lb/in³ step by step

  1. Enter the value in lb/ft³ (the starting unit).
  2. Multiply by 0.0005787037, because 1 lb/ft³ = 0.0005787037 lb/in³.
  3. The product is the value in lb/in³. To go back, divide by 0.0005787037 or multiply by 1,728.

Popular density conversions

How to read your lb/ft³ to lb/in³ result

Quick estimate: multiply by about 0.00058 to get lb/in³ from lb/ft³; this is within 0.3% of the exact factor. These units are numerically convenient: 1 g/cm³ = 1,000 kg/m³ = 1 kg/L.

LB/FT³LB/IN³
10.0005787037
20.001157407
50.002893519
100.005787037
200.01157407
500.02893519
1000.05787037
1,0000.5787037

lb/in³ to lb/ft³: quick table

LB/IN³LB/FT³
11,728
58,640
1017,280
2543,200
5086,400
100172,800
250432,000
500864,000

Common mistakes when calculating lb/ft³ to lb/in³

  • Using US gallons where imperial gallons are meant in lb/gal.
  • Dividing when you should multiply: from lb/ft³ to lb/in³ multiply by 0.0005787037; from lb/in³ to lb/ft³ divide by 0.0005787037.

lb/ft³ to lb/in³ FAQ

How many lb/in³ are in 1 lb/ft³?

1 lb/ft³ equals 0.0005787037 lb/in³.

How many lb/ft³ are in 1 lb/in³?

1 lb/in³ equals 1,728 lb/ft³.

Is 1 lb/ft³ = 0.0005787037 lb/in³ an exact conversion?

The factor is shown rounded to 7 significant figures (0.0005787037). The calculator above uses more digits.

What is a pound per cubic inch (lb/in³)?

About 27,679.9 kg/m³.

How can I estimate lb/ft³ to lb/in³ in my head?

Quick estimate: multiply by about 0.00058 to get lb/in³ from lb/ft³; this is within 0.3% of the exact factor.

What is 80 lb/ft³ in lb/in³?

80 lb/ft³ = 0.0462963 lb/in³ (since 80 × 0.0005787037).

What is 500 lb/ft³ in lb/in³?

500 lb/ft³ = 0.2893519 lb/in³ (since 500 × 0.0005787037).

What is 15 lb/ft³ in lb/in³?

15 lb/ft³ = 0.008680556 lb/in³ (since 15 × 0.0005787037).

How many decimals should I keep when converting lb/ft³ to lb/in³?

Match the precision of your original measurement. For example, 0.005787037 lb/in³ rounds to 0.00579 lb/in³ at 3 significant figures; keep more digits only for engineering or scientific work.

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Method, review and disclaimer

Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors