Bloom Weight Calculator

1. Choose a bloom shape: rectangular or square.
2. Enter the cross-section dimensions and select the unit.
3. Enter bloom length and choose meters or feet.
4. Select a density preset or enter a custom value.
5. Optional: add allowance and lifting factor percentages.
6. Press Calculate Bloom Weight to view results above.
7. Download CSV or PDF for records and coordination.

Weight visibility for site logistics

Bloom weight drives crane selection, rigging layout, transport permits, and laydown sequencing. A single misread can add unplanned picks or overload forklifts. This calculator turns cross‑section and length into a repeatable estimate, so teams can compare bundles, plan lifts, and coordinate storage zones with fewer assumptions on site.

Geometry and density control most variance

Volume is computed from area × length, so small dimension changes matter. For example, a 250×250 mm bloom at 6 m has 0.375 m³ volume. At 7,850 kg/m³ steel density, that is about 2,944 kg per piece. Switching to 300×300 mm increases area by 44%, pushing weight proportionally. If length is entered in feet, it is converted to meters (1 ft = 0.3048 m) before calculating.

Allowances support practical handling

Allowance percent accounts for scale loss, trimming, coatings, and measurement uncertainty. Use low values for certified mill data and higher values for rough field inputs. The lifting factor percent adds a contingency for rigging, hooks, spreaders, and dynamic effects during hoisting. Keeping these separate helps crews discuss “material weight” versus “lifted load,” improving lift brief clarity and reducing last‑minute changes.

Outputs designed for documentation

The tool reports per‑bloom raw weight, adjusted weight, and totals for quantity. Results are shown in kilograms, tonnes, and pounds to match mixed procurement documents, with 1 t = 1000 kg for quick reconciliation. CSV export supports rapid checks in spreadsheets and material logs, while the PDF report is useful for submittals, toolbox briefs, and coordination with lifting supervisors and logistics managers.

Recommended checks before execution

Confirm the bloom type (rectangular or square), verify units, and match density to the actual alloy. Cross‑check one sample piece against a certified shipping list when available, and confirm whether bundles include spacers or bands that add mass. For critical lifts, use engineered lift plans and certified weights. This calculator is best for planning, estimating, and comparing scenarios across suppliers or fabrication stages.

1) What does “bloom weight” mean here?

It is the estimated mass of a bloom piece calculated from its volume and material density, then scaled by quantity and optional allowances for planning.

2) Which units should I use for dimensions and length?

Enter cross‑section dimensions in mm, cm, or inches, and length in meters or feet. The tool converts everything to meters internally.

3) When should I use a custom density?

Use custom density when the alloy differs from common presets, or when a certificate lists a specific density. For typical carbon steel, the default preset works well.

4) Why add an allowance percent?

Allowance covers uncertainty from field measurements, trimming, scale, and minor losses. It helps prevent underestimation when certified weights are not yet available.

5) What is the lifting factor percent?

It adds a contingency over the material total to reflect rigging and handling considerations. Use it for planning lift load discussions, not engineered lift design.

6) Does the PDF export send data to a server?

No. The PDF is generated in your browser using client-side scripting, and the calculator does not upload your inputs during PDF creation.