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Wood Specific Gravity Calculator

This calculator computes the specific gravity of wood given its species and moisture content. Units are in the imperial system.


Calculation

Inputs



Species
:Alder, red​



MC
:0.05​




Output



Gb
:0.37​



S0
:0.09805​



SMC
:0.0978865833333333​



GMC
:0.41​

Where:
  1. 
    
    is the moisture content of the wood, as a percentage (%)
  2. 
    
    is the basic specific gravity, which means the specific gravity at green state (unitless)
  3. 
    
    is the oven-dry moisture content as a percentage of it's green state moisture content (%)
  4. 
    
    is the desired moisture content as a percentage (%)
  5. 
    
    is the specific gravity of wood at a given moisture content, in pounds per cubic foot (unitless)

Explanation

Specific gravity of wood refers to the ratio of the density of wood to the density of water. Materials with an SG > 1.0 are denser than water. A higher specific gravity often signifies stronger, more durable wood, while lower values may indicate softer, less durable varieties.
The equation for specific gravity,

is given by:

GMC=Gb1−SMCG_{MC} = \dfrac{G_b}{1 - S_{MC}}


Related Content

  1. Mass Timber Self-weight Calculator
  2. Wood Density Calculator
  3. Wood Moisture Content Calculator
  4. Wood Shrinkage Calculator
  5. CLT Properties Calculator to ANSI/APA PRG 320