| Item | Shape | Dimensions | Density (kg/m³) | Qty | Estimated weight (kg) |
|---|---|---|---|---|---|
| Sample A | Board | 50×150×2400 mm | 500 | 20 | 180.00 |
| Sample B | Board | 38×89×3000 mm | 720 | 10 | 73.06 |
| Sample C | Log | Ø250×3000 mm | 450 | 2 | 331.27 |
- Rectangular volume: V = t × w × L
- Round log volume: V = π × (d/2)² × L
- Moisture adjustment (simple): ρadj = ρ × (1 + MC/100)
- Total weight: W = Vtotal × ρadj
- Select Shape to match boards or logs.
- Choose the Dimension unit used for your measurements.
- Enter dimensions and the quantity of pieces.
- Pick a species preset, or type a custom density.
- Set moisture content for a heavier wet-timber estimate.
- Press Calculate to view results above the form.
- Use Download CSV or Download PDF for reports.
Purpose and typical use cases
This calculator estimates timber weight for planning lifts, transport loads, and storage. It suits boards, beams, and cylindrical logs where quick checks are needed during procurement, site handling, or yard operations. Use it to compare bundle options, verify crane picks, and understand approximate payload impacts. It also helps estimate handling risk on site and select suitable forklifts.
Input units and dimensional checks
Enter thickness, width, and length for rectangular pieces, or diameter and length for logs. Select a single unit system, then keep measurements consistent. Accurate caliper and tape readings matter because volume scales directly with each dimension. For bundles, confirm that nominal sizes match actual dressed sizes. If pieces are tapered or planed, measure average dimensions across several points for reliability.
Density selection and moisture influence
Choose a species preset when exact data is unavailable, or enter a tested density from supplier sheets. Moisture content increases mass, especially for green timber. The tool applies a practical linear moisture factor to support planning. When critical, weigh a sample piece and back-calculate density for your batch. For treated members, consider added preservative uptake and surface water after rain.
Interpreting results for lifting and transport
Review total volume and weight, then compare against equipment limits, rigging ratings, and vehicle legal loads. Add safety margins for knots, bark, surface water, and mixed species bundles. If you are lifting multiple picks, keep each pick below the lowest-rated component in the lift path. For deliveries, distribute weight evenly, confirm tie-down capacity, and keep axle loads within local regulations and manufacturer guidance.
Quality control and limitations
Results are estimates and assume uniform geometry. Tapered logs, voids, wane, and irregular sections can change volume. Density varies with grade, growth conditions, and treatment. Use this output for early planning and documentation, then confirm with weighbridges or calibrated scales before final handling decisions. Record assumptions in your lift plan, and update the density input as verified field data becomes available.
1) Which density should I use if I do not know the species?
Start with a conservative preset close to your timber type. If unsure, select a higher density to avoid underestimating loads. Replace it later using supplier data or by weighing one measured sample piece.
2) Why does moisture content change the result so much?
Water adds mass without changing the main geometry. Green or rain-soaked timber can be significantly heavier than dry stock. The calculator applies a practical moisture factor to support planning, not laboratory precision.
3) Should I enter nominal or actual board sizes?
Use actual measured dimensions whenever possible. Nominal sizes can differ due to planing, shrinkage, and manufacturing tolerances. Measuring a few boards and averaging gives a more realistic bundle estimate.
4) How do I estimate tapered logs?
Measure diameter at both ends, take the average, and enter that value. For critical lifts, add an extra safety margin or use a more detailed volume method. Irregularity and bark thickness can change mass.
5) Can I use the output for crane lift plans?
Use it for preliminary planning and documentation, then verify with real weights when available. Always check the lowest-rated component in the lifting system and apply site safety factors required by your procedures.
6) Why do the CSV and PDF show the same numbers?
Both exports use the same inputs and calculation steps. Choose CSV for spreadsheets and sharing, and PDF for quick reporting. If you change any input, download again to keep the record consistent.