Calculate a source-owned mass interval for one uniform rectangular solid, round solid, round tube, or rectangular tube stock group from actual dimensions, exact quantity, and documented density bounds.
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Inputs that matter
One named uniform stock-group record and basis; responsible review record; exact material/product/lot identity; one supported idealized shape chosen from rectangular solid, round solid, round tube or rectangular tube; one dimension unit; source-owned actual length and active cross-section dimensions, including explicit inner diameter or inner width/height for tubes; exact whole-piece quantity and quantity source; one density unit with source-owned lower and upper density bounds plus exact source/edition/table-row/condition evidence; explicit excluded-geometry record; downstream decision boundary; and an optional supplier or scale total with its own kg/lb unit and same-scope source
Output to expect
Normalized active dimensions; supported outer-minus-inner cross-section area; per-piece and total idealized volume; source-owned density interval normalized to kg/m³; per-piece, total and per-length mass intervals in metric and imperial display units; optional comparison total classified below, inside or above the calculated interval with signed differences from each endpoint and midpoint, nearest-boundary distance and midpoint percentage; complete source and boundary evidence; deliberate page-session snapshots, copy/Markdown/print/share actions; and stable Project outputs that keep density/material selection, geometry certification, hidden-feature modeling, lifting/handling, transport/storage, structural, fabrication and procurement approval false
How it works
Validate one coherent uniform stock group; convert active dimensions to metres and density bounds to kg/m³; calculate rectangular solid area as width times height, round solid area as πd²/4, round tube area as π(OD²−ID²)/4, or rectangular tube area as outer width times outer height minus inner width times inner height; multiply area by length and exact quantity for volume, then multiply by both source-owned density bounds for mass intervals; optionally normalize one same-scope source total and subtract the interval endpoints and midpoint without treating agreement as certification
The exact material/product/lot identity, actual dimensions, source revision, density condition/basis and quantity scope must travel together. A generic alloy name, memorized table, mixed lot, nominal dimension, unsupported shape, missing inner tube dimensions or another source revision requires an accountable source record and is not silently inferred.
Idealized geometry excludes every unentered hole, slot, cutout, bevel, chamfer, taper, corner radius, weld, coating, scale, corrosion, end treatment, deformation or density variation. Comparison agreement can reveal arithmetic consistency only; it does not certify the item, source, scale, drawing, product or fabrication.
Keep lifting and manual-handling methods, equipment capacity, rigging, centre of gravity, load distribution, freight class, payload and restraint, stacking and storage stability, rack/shelf/structure capacity, material suitability, fabrication allowance, purchase quantity, cost, compliance and work authorization with current exact sources, rated systems and responsible qualified reviewers.
Choose your path
Built around the job you need to finish
Calculate one uniform metal stock group's idealized volume and source-owned mass interval from one explicit supported shape, actual dimensions, exact quantity and documented density interval; optionally compare one same-scope supplier or scale total while refusing material selection, geometry certification and every handling, transport, structural or procurement approval.
Receiving reviewer reconciling a supplier stock line
Reproduce the mass range for one uniform delivery without trusting a generic alloy preset or nominal trade description.
Name the supplier line, retain product/lot and source revisions, choose the exact shape and units, enter actual dimensions, count and both documented density bounds, list excluded features, then calculate and compare the supplier total.
Receives per-piece, total and per-length intervals plus a transparent comparison relation while the material identity, density applicability and delivery acceptance remain with accountable records.
Calculate round or rectangular tube mass without assuming wall thickness, corner radii or hidden cutouts.
Select round tube or rectangular tube, enter explicit outer and inner dimensions with length and quantity, record the drawing/measurement and density sources, then inspect the idealized cross-section and boundary warning.
Can reproduce outer-minus-inner geometry and identify every excluded feature without treating the result as material, fabrication, structural or purchasing approval.
Safety and logistics reviewer limiting downstream use
Use a mass record as one input without letting a calculator choose lifting, handling, freight, restraint, storage or rack capacity.
Review the responsible role and downstream boundary, inspect optional scale comparison differences, retain a de-identified page-session snapshot, export or copy the record, then clear snapshots when finished.
Keeps only reproducible geometry/density arithmetic and source evidence; every equipment, rigging, centre-of-gravity, payload, restraint, stacking, storage and structural decision stays external.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
Rectangular solids use width × height; round solids use πd²/4; round tubes use π(OD² − ID²)/4; rectangular tubes use outer width × outer height minus inner width × inner height. Every tube needs explicit inner dimensions, so the Tool does not infer wall thickness or corner radii.
Enter lower and upper density values from one exact material, product, condition, revision, and table row. Equal bounds are allowed when the source owns one value. The Tool converts the entered unit but never supplies a generic steel, aluminum, copper, stainless, or brass default.
mass interval = volume × [source density lower, source density upper]
Compare without approving
An optional supplier or scale total for the same quantity and scope is normalized to kilograms and classified below, inside, or above the calculated interval. Signed endpoint and midpoint differences expose arithmetic disagreement without deciding which source is correct.
difference = recorded comparison total − calculated interval or midpoint
Updated: September 2026
Example Scenarios
A receiving reviewer records 24 uniform 100 × 10 × 1000 mm pieces and a source-owned 7.80–7.90 g/cm³ density interval. The Tool reproduces the idealized per-piece and total intervals and compares the supplier's same-scope total without accepting the delivery or choosing handling equipment.
A fabricator enters the measured outer diameter, inner diameter, length, count, drawing reference, and exact-product density source. The Tool subtracts the bore area but leaves seams, end treatments, coatings, tolerances, and fabrication decisions in the exclusion record.
A reviewer enters explicit outer and inner width/height rather than a nominal wall thickness, then compares one same-quantity scale total. A result inside the interval shows arithmetic consistency only; it does not certify geometry, density, the scale, or structural use.
Common Mistakes to Avoid
✕
Choosing a generic density from memory because the material name looks familiar
✓
Transcribe both bounds from a source that owns the exact material/product condition and retain its revision and locator. The Tool intentionally provides no generic material defaults.
✕
Treating idealized geometry or supplier agreement as certification
✓
Record holes, radii, seams, coatings, cutouts, tolerances, deformation, and other exclusions. Keep material, geometry, fabrication, handling, transport, structural, procurement, and compliance decisions with accountable sources and reviewers.
FAQ
A broad alloy name does not own the exact composition, product form, condition, temperature, lot, revision, or property basis. Use a current supplier, manufacturer, specification, drawing, or qualified measurement record that matches the stock scope, and retain its locator with the input.
Explicit inner dimensions avoid silently treating nominal wall thickness as exact. The idealized rectangle still excludes real corner radii, seams, taper, deformation, coatings, and other features, which must be named in the exclusion record.
The Tool reports mass in kilograms and pounds from mass density × volume. It does not calculate gravitational force, centre of gravity, load distribution, dynamic effects, or rated capacity.
It means only that the entered supplier or scale total falls between the two calculated bounds for the recorded scope. It does not validate the density source, drawing, dimensions, count, scale, product, or delivery.
No. Equipment capacity, rigging, centre of gravity, manual handling, load distribution, payload, restraint, stacking, rack or shelf capacity, and storage stability require current rated-system evidence and accountable safety review outside this Tool.
About Metal Stock Mass Record
Reproduce one uniform stock group's idealized volume and mass interval without silently choosing a material property. Select one supported shape, enter actual dimensions and an exact quantity, then transcribe both density bounds from a source that owns the exact material or product condition. An optional supplier or scale total can be compared with the calculated interval, but agreement is not certification and the result never approves handling, transport, storage, structural use, fabrication, or procurement.
