Convert kg/m³ to kg/ft³ Instantly
Use this Kilograms per Cubic Meter to Kilograms per Cubic Foot converter to change density from kg/m³ into kg/ft³ with an exact volume relationship. Enter any positive or zero density value to see kg/ft³ plus other useful density units, or switch to the reverse calculator when your starting value is already in kilograms per cubic foot.
Convert kilograms per cubic meter to kilograms per cubic foot, reverse the conversion, calculate density from mass and volume, or compare one density across several common units.
Enter density in kg/m³ to calculate the equivalent value in kg/ft³ and other useful density units.
Example: normal-weight concrete is often around 2,300–2,400 kg/m³.
Use the reverse density formula when your starting measurement is already in kg/ft³.
Enter a mass in kilograms and a volume in cubic meters or cubic feet to calculate density in both kg/m³ and kg/ft³.
Convert one density value across kg/m³, kg/ft³, g/cm³, kg/L, and lb/ft³.
Enter kg/m³ and get kg/ft³ without manually handling cubic-volume factors.
Convert kilograms per cubic foot back to kilograms per cubic meter with one click.
See g/cm³, kg/L and lb/ft³ equivalents alongside the main result.
Responsive inputs, results, FAQ cards and scrollable conversion tables.
Kilograms per cubic meter to kilograms per cubic foot is a density conversion. The numerator stays in kilograms, but the denominator changes from one cubic meter to one cubic foot. Because a cubic foot is much smaller than a cubic meter, the numerical density expressed in kg/ft³ is smaller than the same physical density expressed in kg/m³.
The exact relationship comes from the international definition of the foot. One foot is exactly 0.3048 meter, so one cubic foot is exactly 0.028316846592 cubic meter. A material with a density of 1 kg/m³ therefore contains 0.028316846592 kg in a one-cubic-foot volume. This gives the direct factor used by the calculator.
For the reverse direction: kg/m³ = kg/ft³ × 35.3146667215.
This type of conversion is useful in construction, materials testing, shipping, storage, engineering specifications, laboratory work, insulation data, aggregates, concrete mixes, wood products, liquids, and any situation where density data crosses metric and cubic-foot-based documentation.
To convert kilograms per cubic meter to kilograms per cubic foot, multiply the density value by 0.028316846592. The steps are straightforward:
Identify the value given in kg/m³.
Confirm the value is density, not mass alone.
Multiply by 0.028316846592.
Write the result as kg/ft³.
Round only to the precision you need.
Multiply 1,000 by 0.028316846592. The result is 28.316846592 kg/ft³. This is a useful benchmark because 1,000 kg/m³ is also 1 g/cm³ and 1 kg/L.
Multiply 2,400 by 0.028316846592. The result is 67.9604318208 kg/ft³. Values near this range are often encountered when discussing normal-weight concrete, though actual density depends on the mix and test conditions.
The following table provides common density values. Use the calculator for values not listed or when you need more decimal places.
| kg/m³ | kg/ft³ | g/cm³ | lb/ft³ |
|---|---|---|---|
| 1 | 0.02831685 | 0.001 | 0.06242796 |
| 10 | 0.28316847 | 0.01 | 0.62427961 |
| 100 | 2.83168466 | 0.1 | 6.24279606 |
| 500 | 14.15842330 | 0.5 | 31.21398029 |
| 1,000 | 28.31684659 | 1 | 62.42796058 |
| 1,200 | 33.98021591 | 1.2 | 74.91355269 |
| 1,500 | 42.47526989 | 1.5 | 93.64194086 |
| 2,000 | 56.63369318 | 2 | 124.85592115 |
| 2,400 | 67.96043182 | 2.4 | 149.82710538 |
| 2,500 | 70.79211648 | 2.5 | 156.06990144 |
| 3,000 | 84.95053978 | 3 | 187.28388173 |
| 5,000 | 141.58423296 | 5 | 312.13980288 |
| 10,000 | 283.16846592 | 10 | 624.27960576 |
The factor is based on volume, not on a change in the kilogram. The kilogram is identical on both sides of the conversion. Only the cubic unit changes.
Since one foot equals exactly 0.3048 meter, cube that relationship to convert cubic feet into cubic meters:
Therefore, the mass present in one cubic foot at a density of 1 kg/m³ is 0.028316846592 kg.
The inverse relationship is also useful: one cubic meter equals approximately 35.3146667215 cubic feet. That inverse factor explains why a value in kg/ft³ is multiplied by 35.3146667215 when converting back to kg/m³.
Kilograms per cubic meter is an SI-derived density unit. A density of 800 kg/m³ means that one cubic meter of the material has a mass of 800 kilograms under the stated conditions.
Kilograms per cubic foot uses kilograms for mass but cubic feet for volume. It is a mixed metric–imperial expression that can appear in technical documents, software, product data, or project calculations where mass is recorded in kilograms while volume is measured in cubic feet.
A cubic foot is only about 2.8317% of a cubic meter. At the same physical density, a cubic foot contains only 2.8317% of the mass contained in a cubic meter. That is why the number in kg/ft³ equals the kg/m³ number multiplied by 0.028316846592.
Concrete, mortar, grout, masonry products and aggregates are often specified using density or unit weight. A project may use metric test data in kg/m³ while material volumes are tracked in cubic feet. Converting the density allows consistent calculations across both systems. For related estimating, see the Concrete Batch Calculator and Cement Sand Gravel Calculator.
Foam, mineral wool, fiberboard and other insulation products can be compared using density. Manufacturers may publish metric density, while designers or contractors working with U.S. customary dimensions may need an equivalent cubic-foot expression.
Material density helps with weight estimation, structural calculations, handling and transportation. A density converter lets you retain kilograms as the mass unit while adapting to dimensions recorded in feet.
Warehouses and freight calculations often combine mass and volume information. When shipment mass is in kilograms and container or storage volume is in cubic feet, kg/ft³ can be a convenient intermediate density unit.
Engineers may receive specifications from different countries or software systems. Converting density into the unit required by a calculation avoids mixing a kg/m³ number with a ft³ volume, which would otherwise produce an incorrect mass result.
For the reverse conversion, multiply kilograms per cubic foot by approximately 35.3146667215. This is the reciprocal of 0.028316846592.
Example: 28.316846592 kg/ft³ × 35.3146667215 = 1,000 kg/m³.
You can use the second calculator panel above for this reverse direction. If you frequently work from cubic-foot density first, the dedicated Kilograms per Cubic Foot to Kilograms per Cubic Meter converter is also useful.
Density can be expressed in many equivalent forms. The multi-unit calculator makes these relationships easier to compare:
The kg/m³ to lb/ft³ relationship changes both mass and volume units, while kg/m³ to kg/ft³ changes only the denominator volume unit. Keeping this distinction clear helps prevent conversion mistakes.
The underlying foot-to-meter relationship is exact, but your final answer should reflect the precision of the original density measurement. If a specification says 2,400 kg/m³ with only two or three meaningful significant figures, displaying a dozen decimal places in kg/ft³ does not make the source measurement more precise.
250 × 0.028316846592 = 7.079211648 kg/ft³.
600 × 0.028316846592 = 16.9901079552 kg/ft³.
785 × 0.028316846592 = 22.2297245747 kg/ft³.
1,800 × 0.028316846592 = 50.9703238656 kg/ft³.
2,300 × 0.028316846592 = 65.1287471616 kg/ft³.
7,850 × 0.028316846592 = 222.2872457472 kg/ft³.
The conversion used on this page follows the exact international foot definition and standard SI relationships. For primary reference material, consult the NIST Guide to SI conversion factors and the BIPM SI Brochure.
These references are useful when you need documented unit definitions for engineering, quality, laboratory or regulatory work rather than a rounded rule of thumb.
If your project moves between mass, volume and density units, you may also need the Tons to Kilograms converter, Grams to Kilograms converter, or the reverse kg/ft³ to kg/m³ converter. For concrete material calculations, the Concrete Batch Calculator can help connect batch quantities with project volume.
The material is identical; only the volume used in the denominator changes.
Best when project dimensions, volumes, specifications or data systems are metric. Multiply kg/m³ by m³ to obtain kilograms of mass.
Useful when mass remains in kilograms but volume is measured in cubic feet. Multiply kg/ft³ by ft³ to obtain kilograms of mass.
Quick answers about kilograms per cubic meter, kilograms per cubic foot, density formulas and unit conversions.