Lumber Volume Calculator
Timber is traded by the cubic metre. Convert the section in millimetres to metres, then multiply by length and the number of pieces.
Your numbers
Volume
0.2916m³
Result
0.02916m³
Weight
145.8kg
Formula
Volume = Width ÷ 1000 × Thickness ÷ 1000 × Length × Count
Weight assumes 500 kg/m³. Pine runs 400–500 and oak over 700, so species matters a great deal.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Width (mm)The measurement front to back. | 90 | 1 and up |
| Thickness (mm)How thick one layer is; times the number of layers gives the whole. | 90 | 1 and up |
| Length (m)The measurement across, side to side. | 3.6 | 0 and up |
| CountA plain count of items; it often ends up as the denominator. | 10 | 1 and up |
Step by step
Quick reference table
Results when only Width (mm) changes and everything else stays put.
| Width (mm) | Volume (m³) | Result (m³) | Weight (kg) |
|---|---|---|---|
| 45 | 0.1458 | 0.01458 | 72.9 |
| 67.5 | 0.2187 | 0.02187 | 109.4 |
| 90 | 0.2916 | 0.02916 | 145.8 |
| 135 | 0.4374 | 0.04374 | 218.7 |
| 180 | 0.5832 | 0.05832 | 291.6 |
What each result means
| Result | At default values |
|---|---|
| Volume (m³)The space a solid holds — length cubed. | 0.2916 |
| Result (m³)What the formula gives back — the answer this page is for. | 0.02916 |
| Weight (kg)Weight in tonnes; one tonne is 1,000 kg. | 145.8 |
Common mistakes
Weight assumes 500 kg/m³. Pine runs 400–500 and oak over 700, so species matters a great deal.
Glossary
- Width
- The measurement front to back.
- Thickness
- How thick one layer is; times the number of layers gives the whole.
- Length
- The measurement across, side to side.
- Count
- A plain count of items; it often ends up as the denominator.
- Volume
- The space a solid holds — length cubed.
- Result
- What the formula gives back — the answer this page is for.
- Weight
- Weight in tonnes; one tonne is 1,000 kg.
Frequently asked questions
Q. How is Lumber Volume Calculator calculated?
Volume = Width ÷ 1000 × Thickness ÷ 1000 × Length × Count — Timber is traded by the cubic metre. Convert the section in millimetres to metres, then multiply by length and the number of pieces.
Q. Can you walk through an example?
With Width 90mm, Thickness 90mm, Length 3.6m, Count 10, the answer is Volume 0.2916m³.
Q. What do I need to enter?
Enter Width, Thickness, Length, Count. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Width (mm) moves the answer to Width (mm) 45 → Volume (m³) 0.1458 and Width (mm) 180 → Volume (m³) 0.5832. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Weight assumes 500 kg/m³. Pine runs 400–500 and oak over 700, so species matters a great deal.
Related calculators
Keep your length units consistent across inputs — mixing centimetres and metres throws results far off.