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# Fire Wood - the Cord

## The cord unit for purchasing fuel wood.

The chord is the most commonly used measurement unit for purchasing fuel wood.

A cord is a stacked unit volume of wood where

1 cord = (4 ft) (4 ft) (8 ft)

= 128 cubic feet

or in metric units

1 cord = (1.22 m) (1.22 m) (2.44 m)

= 3.62 m3

This volume includes bark and air space. Due to the irregular shape of wood the air space in the cord can be as high as 40 percent. The net cord volume can therefore be as low as 75 cubic feet. In general net cord volume ranges 80 - 100 cubic feet.

### How to Calculate the Cords

To calculate the number of cords in a pile of fire wood - measure the length (l), the width (w) and the height (h) of the pile. Calculate the volume of the pile and divide the volume with 128 if your unit is feet - or with 3.62 if your unit is m.

#### Example - Calculate the number of Cords

A pile with fire wood is 12 ft long, 2.5 ft wide and 6 ft high. The number of cords in the pile can be calculated as

(12 ft) (2.5 ft) (6 ft) / 128

= 1.4 cord

A pile with fire wood is 6 m long, 1.2 m wide and 1.5 m high. The number of cords in the pile can be calculated as

(6 m) (1.2 m) (1.5 m) / 3.62

= 3 cord

### Typical Firewood

• Ash, white - Hardwood - Good firewood
• Beech - Hardwood - Good firewood
• Birch, yellow - Hardwood - Good firewood
• Chestnut - Hardwood - Excessive sparking, can be dangerous
• Cottonwood - Hardwood - Good firewood
• Elm, white - Hardwood - Difficult to split, burns well
• Hickory - Hardwood - Slow steady fire, best firewood
• Maple, sugar - Hardwood - Good firewood
• Oak, red - Hardwood - Slow steady fire
• Oak, white - Hardwood - Slow steady fire
• Pine, yellow - Softwood - Quick hot fire, smokier than hardwood
• Pine, white - Softwood - Quick hot fire, smokier than hardwood
• Walnut, black - Hardwood - Good firewood

## Related Topics

• ### Combustion

Combustion processes and their efficiency. Boiler house and chimney topics. Properties of fuels like oil, gas, coal and wood and more. Safety valves and tanks.

## Related Documents

• ### Biomasses - Energy Content when Used as Fuel

Biomass fuels and their energy content.
• ### Hardwood and Softwood Species

Species of hardwood vs. softwood.
• ### Lumber - Weights

Weights of green, kiln dried and pressure treated lumber boards.
• ### Softwood Lumber - Standard Sizes

Nominal and minimum-dressed lumber sizes.
• ### Tree Species - Water Demand

Trees species and relative water demand.
• ### Urban Tree Heights

Height of trees commonly used in towns and urban areas.
• ### Wood - Combustion Heat Values

Combustion of wood and firewood heat values for species like Pine, Elm, Hickory and more.
• ### Wood - Compressive Strength vs. Moisture Content

Red Spruce, Longleaf Pine and Douglas Fir - moisture content and their compressive strength.
• ### Wood - Density vs. Moisture Content

The density of wood versus moisture content.
• ### Wood and Bio Mass - Combustion Heat

Combustion heat values for wet and dry wood - Btu/pounds, kJ/kg and kcal/kg.
• ### Wood Species - Densities

Densities of various wood species - apple, ash, cedar, elm and more.
• ### Wood Species - Moisture Content and Weight

Weight of green and air-dried fire wood.

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## Citation

• The Engineering ToolBox (2005). Fire Wood - the Cord. [online] Available at: https://www.engineeringtoolbox.com/cord-fuel-wood-d_820.html [Accessed Day Month Year].

Modify the access date according your visit.

7.8.15

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