What is the conversion factor from kg/m³ to lb/ft³?

The exact factor is 0.0624279606. This comes from the definitions: 1 pound = 0.45359237 kg and 1 foot = 0.3048 m, so 1 lb/ft³ = 0.45359237 / 0.3048³ kg/m³ ≈ 16.01846 kg/m³, and the inverse is 1/16.01846 ≈ 0.0624279606.

What is water density in lb/ft³?

Pure water at 4 °C (maximum density) is 1000 kg/m³, which equals 62.428 lb/ft³. At room temperature (20 °C) water is 998.2 kg/m³ ≈ 62.316 lb/ft³.

Why do engineers use both kg/m³ and lb/ft³?

Most of the world and international scientific literature uses SI units (kg/m³), while US construction, timber, and HVAC industries traditionally use lb/ft³. Engineers often need to convert when working with mixed-unit project documents or international datasheets.

How dense is concrete in lb/ft³?

Normal-weight concrete is typically 2,300–2,400 kg/m³, which is about 143–150 lb/ft³. Lightweight concrete ranges from 1,440–1,840 kg/m³ (90–115 lb/ft³).

Can I convert lb/ft³ back to kg/m³?

Yes — multiply lb/ft³ by 16.01846 to get kg/m³. This tool supports reverse conversion: just type in the lb/ft³ field and the kg/m³ result appears automatically.

kg/m3 to lb/ft3 Converter

Name: kg/m3 to lb/ft3 Converter
Availability: InStock
Author: Nham Vu

Enter a density in kg/m³ and instantly get pounds per cubic foot, with a reference table of common material densities.

Density Conversion

kg/m³ (kilograms per cubic meter)

lb/ft³ (pounds per cubic foot)

Formula: lb/ft³ = kg/m³ × 0.0624279606

Common Material Densities

Click a row to load that density into the converter.

Material	kg/m³	lb/ft³

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Summary

Enter a density in kg/m³ and instantly get pounds per cubic foot, with a reference table of common material densities.

How it works

Enter a density in the kg/m³ field; the lb/ft³ result appears instantly.
Or type in the lb/ft³ field to convert back to kg/m³.
The tool multiplies kg/m³ by 0.0624279606 to get lb/ft³.
Click any row in the reference table to load that material's density.
Copy either result with one click using the copy button.

Use cases

Convert concrete density from metric specs to US construction standards.
Translate fluid density from SI datasheets for imperial-unit hydraulic calculations.
Compare timber densities in lb/ft³ when sourcing lumber from metric-spec suppliers.
Convert soil bulk density for earthworks and geotechnical reports.
Check insulation material density in lb/ft³ against US building code minimums.
Verify density values when switching between metric and imperial engineering software.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu