Unit Weight of Stone in kg/m³

Unit Weight Formula:

\[ \gamma = \rho \times g \]

Unit Weight (kN/m³):

Definition: Unit weight (γ) represents the weight per unit volume of stone, typically measured in kN/m³.

Purpose: This calculation is essential for structural engineering, foundation design, and construction material estimation.

The calculator uses the formula:

\[ \gamma = \rho \times g \]

Where:

Explanation: The density is converted from mass to weight by multiplying by gravitational acceleration.

Range: Most natural stones have unit weights between 21.6–29.4 kN/m³ (2200–3000 kg/m³ density).

Tips: Enter the stone density in kg/m³ (default 2200) and gravity constant (default 9.81 m/s²). All values must be > 0.

Q1: What's the difference between density and unit weight?
A: Density is mass per volume (kg/m³), while unit weight is force per volume (kN/m³).

Q2: Why use kN/m³ instead of kg/m³?
A: kN/m³ is the standard unit for structural calculations involving weight and forces.

Q3: What density should I use for granite?
A: Granite typically has a density of 2600-2800 kg/m³ (25.5-27.5 kN/m³ unit weight).

Q4: Does moisture affect the unit weight?
A: Yes, wet stone can be 3-5% heavier than dry stone due to water absorption.

Q5: How precise is this calculation?
A: Very precise for uniform materials, but natural stone variations may cause ±2% differences.