About

The "What is inside?" problem is the central challenge in converting Cubic Meters to Kilograms. Unlike simple length conversions, this calculation requires knowledge of the material's density. 1 m³ of feathers weighs vastly less than 1 m³ of lead.

This tool addresses the needs of construction managers ordering aggregate, farmers calculating grain silo loads, and logistics coordinators. It features a massive database of standard densities for materials ranging from dry river sand to reinforced concrete and agricultural products. It also includes a custom density option, allowing users to input specific laboratory values for specialized compounds.

Formulas

The fundamental physics equation relates Mass (m), Density (ρ), and Volume (V):

m = V × ρ

Where:

m is mass in kg.
V is volume in m³.
ρ is density in kg/m³.

Reference Data

Category	Material	Approx. Density (kg/m³)
Construction	Concrete (Reinforced)	2400
Construction	Sand (Wet)	1920
Construction	Gravel (Loose)	1520
Agriculture	Wheat	770
Agriculture	Corn (Shelled)	720
Liquids	Water (Pure)	1000
Liquids	Diesel Fuel	850
Metals	Steel	7850
Earth	Clay (Compact)	1760
Earth	Topsoil	1280

Frequently Asked Questions

Sand density depends heavily on moisture content and compaction. Dry loose sand weighs approx 1440 kg/m³, while wet packed sand can exceed 2000 kg/m³. Always use the "Wet" or "Dry" options or a custom value for critical loads.

Use the "Custom Density" slider. You can find the specific gravity or density of your material on its Material Safety Data Sheet (MSDS) or product packaging.

Technically yes, but gases are highly compressible. This calculator is designed for solids and liquids where density is relatively constant under standard atmospheric pressure.

Only for pure water at 4°C. For almost every other substance, this ratio is different. Oil is lighter (approx 850 kg/m³), while steel is nearly 8 times heavier.