This Wood CFT calculator finds the volume of timber in cubic feet (CFT) for both sawn boards and round logs. Enter your dimensions above to get the lumber volume for pricing or ordering.
How is wood CFT calculated?
Sawn timber: CFT = Length × Width × Thickness (all in feet)
(from inches: L″ × W″ × T″ ÷ 1728)
Round log: CFT = (Girth ÷ 4)² × Length (quarter-girth rule)
Example calculations
Sawn plank 8 ft long, 6 in wide, 2 in thick:
- CFT = 8 × 0.5 × 0.167 = 0.67 CFT
Round log with a 2 ft girth, 10 ft long:
- CFT = (2 ÷ 4)² × 10 = 0.25 × 10 = 2.5 CFT
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Frequently Asked Questions
How do I calculate wood CFT?
For sawn timber, multiply length, width, and thickness in feet. A plank 8 ft by 6 in by 2 in equals 0.67 cubic feet.
How do I calculate CFT of a round log?
Use the quarter-girth rule: divide the girth by 4, square it, then multiply by the length. A 2 ft girth log 10 ft long is about 2.5 CFT.
What is CFT in the timber trade?
CFT stands for cubic feet, the standard unit for pricing and trading lumber. One CFT is the volume of a 1-foot cube.