For round logs enter girth (inches); for sawn enter width and thickness (inches).
Enter each piece's length (feet) and how many pieces.
Add a per-CFT price for the cost; leave it out for CFT only.
Formulas
Type
Formula
Example
Round log (Hoppus)
(girth ÷ 4)² × length ÷ 144
(36 ÷ 4)² × 10 ÷ 144 = 5.625 CFT
Sawn timber
width × thickness × length ÷ 144
6 × 3 × 10 ÷ 144 = 1.25 CFT
Total
per piece × pieces
5.625 × 2 = 11.25 CFT
Cost
total CFT × price per CFT
11.25 × Tk 1,500 = Tk 16,875
Examples
Round log: 36 in girth, 10 ft long, 2 pieces — (36 ÷ 4) = 9, 9² = 81, 81 × 10 = 810, 810 ÷ 144 = 5.625 CFT a piece. Total 5.625 × 2 = 11.25 CFT. At Tk 1,500 per CFT the cost is 11.25 × 1,500 = Tk 16,875.
Sawn timber: 6 in wide, 3 in thick, 10 ft long, 4 pieces — 6 × 3 × 10 = 180, 180 ÷ 144 = 1.25 CFT a piece. Total 1.25 × 4 = 5 CFT. At Tk 2,000 per CFT the cost is Tk 10,000.
Ready CFT per piece
Round log (10 ft long)
CFT
24 in girth
2.5
30 in girth
3.91
36 in girth
5.625
42 in girth
7.66
48 in girth
10
Sawn timber (10 ft long)
CFT
6 × 3 in
1.25
8 × 4 in
2.22
10 × 5 in
3.47
12 × 6 in
5
What to know in Bangladesh
Hoppus reads low: a true cylinder is girth² ÷ (4π) × length, while Hoppus takes girth² ÷ 16 × length — about 78.5% of the truth. Everyone trades on Hoppus, so buyer and seller should use the same tape.
Buy with a margin: dressing, cracks and cuts waste wood. Buy 10–15% more CFT than the furniture or frame design needs.
Rates vary by species: teak costs most, then mahogany, acacia and raintree. The same CFT costs differently by species, seasoning and district — enter your market’s rate.
Watch the measure: green timber looks swollen and heavy, then shrinks as it dries. Settle the price on dry measurements and get the CFT written on the receipt.
More: where 144 and Hoppus come from
One cubic foot is 12 × 12 × 12 = 1,728 cubic inches. Sawn volume in (in × in × ft) needs the length in inches (× 12), so CFT = width × thickness × (length × 12) ÷ 1,728 = width × thickness × length ÷ 144.
For round logs Hoppus squares girth ÷ 4, which is the square timber that fits out of the log rather than the round cylinder. True cylinder volume is girth² ÷ (4π) × length; Hoppus is girth² ÷ 16 × length. The ratio is (1 ÷ 16) ÷ (1 ÷ 4π) = π ÷ 4 ≈ 0.785, so Hoppus counts 78.5% and treats the rest as bark and waste — which is why a buying margin matters.
Width × thickness × length ÷ 144. Example: 6 × 3 × 10 ÷ 144 = 180 ÷ 144 = 1.25 CFT. Width and thickness are in inches, length in feet.
Does Hoppus give the true volume?
No — Hoppus gives about 78.5% (π/4) of a cylinder's true volume. The market still trades round logs on it, so measure with the same tape and buy 10–15% extra.
How is the price worked out?
Total CFT × price per CFT. Example: 11.25 × Tk 1,500 = Tk 16,875. Rates vary by species (teak, mahogany, acacia) and market, so enter your own rate.
Where do I measure the girth?
Tape around the middle of the log. If it tapers a lot, measure two or three spots and take the average.
How many pieces do I need?
Work out the CFT your door frames or furniture need, then divide by one piece's CFT. Enter the size here and adjust the count until the total matches.