Input parameters
Dimensions are entered in millimetres (mm) for sizes and metres (m) for length. Density is in kilograms per cubic metre (kg/m³).
Example stainless steel weight values
These examples use a density of 8000 kg/m³ and are rounded to two decimal places.
| Shape | Dimensions | Length | Approximate weight |
|---|---|---|---|
| Sheet / plate | Thickness 6 mm, width 1000 mm | 2 m | ≈ 96.00 kg |
| Round bar | Diameter 20 mm | 1 m | ≈ 2.51 kg |
| Square tube | 40 × 40 × 3 mm | 1.5 m | ≈ 5.33 kg |
| L-angle | 50 × 50 × 5 mm | 1 m | ≈ 3.80 kg |
Formulas used in this calculator
The calculator is based on standard geometric volume relationships and the fundamental relationship between volume, density and mass.
- General relationship: Weight (kg) = Volume (m³) × Density (kg/m³).
- Sheet / plate / flat bar: Volume = thickness × width × length.
- Round bar: Volume = π × (diameter / 2)² × length.
- Square bar: Volume = side × side × length.
- Hex bar (across flats): Volume = (√3 / 2) × (across flats)² × length.
- Round pipe: Volume = π × (Router² − Rinner²) × length.
- Square / rectangular tube: Volume = (outer side² − inner side²) × length.
- L-angle (approximate): Volume = thickness × (leg A + leg B − thickness) × length.
Real-world products may have tolerances, weld seams or machining allowances. Always verify critical weights against mill certificates or supplier data when accuracy is essential.
How to use this stainless steel weight calculator
- Select the stainless steel grade that best matches your material, or choose a custom density if you have a specific value.
- Enter the length per piece in metres and the number of pieces you plan to use or purchase.
- Choose the shape that matches your section: sheet, flat bar, bar, pipe, tube or angle profile.
- Fill in the required dimensions in millimetres for the selected shape. Irrelevant fields can be left blank.
- Optionally, enter a cost per kilogram to obtain an estimated total material cost alongside the weight results.
- Click the Calculate stainless steel weight button to view single-piece and total weights in kilograms and pounds.
- Use the Download CSV button for spreadsheets or the Download PDF button to save a compact calculation report.
Practical tips for stainless steel weight estimates
Use realistic lengths, measure thickness with a caliper when possible and round results sensibly. For fabrication quotes, keep a safety margin for offcuts and wastage.
Choosing the right grade and density value
Common austenitic grades 304 and 316 are close to 8000 kg/m³. Ferritic and martensitic grades are slightly lighter. Use the custom density option if your mill certificate lists a different value.
Comparing stainless sections with aluminium alternatives
When checking crane capacity or manual handling, compare stainless results with aluminium of similar size using the Aluminium Weight Calculator. Aluminium can be dramatically lighter for non structural or decorative components.
Estimating sheet bundle weights for lifting gear
For repeating sheet sizes, calculate weight of one plate then multiply by the stack count. You can also benchmark against generic plate stacks using the Sheet Weight Calculator on your construction tools hub.
Using weight results for material cost breakdowns
Enter your price per kilogram to turn weight into a quick material estimate. Split the total between projects, floors or assemblies to understand how stainless steel impacts overall construction budgets.
Checking loads on supporting steelwork
Total weight helps you verify beam, joist or bracket capacity. For carbon steel members, cross check self weight using the Mild Steel Weight Calculator so that stainless cladding or tanks do not overload supporting frames.
Frequently asked questions
How accurate is this stainless steel weight calculator?
It assumes uniform density and ideal geometry, so results are usually within a few percent of actual weight. Mill tolerances, weld seams, surface finish and fittings can add or subtract a little from the calculated value.
Can I use this tool for stainless checker plate?
Yes, but add a small allowance because tread patterns increase metal volume slightly. Many fabricators assume an extra five to ten percent when estimating checker plate weight for transport and lifting calculations.
What units should I use for entering length and dimensions?
Enter all section dimensions in millimetres and the length per piece in metres. The calculator converts everything internally to cubic metres and multiplies by density to give final weight in kilograms and pounds automatically.
How do I estimate weight for a mixed batch of parts?
Run the calculator separately for each shape or thickness, note total weight for that subset, then add the subtotals. Use CSV export to store individual runs and combine them later inside your spreadsheet or estimating workbook.
Is it safe to size lifting gear directly from these results?
Always treat the result as a starting point. Choose lifting equipment with generous safety factors and follow applicable codes. When loads are critical, confirm weights against supplier data or weigh the item before finalising rigging plans.
Can this calculator help compare stainless and mild steel?
Yes. Estimate stainless components here, then evaluate equivalent carbon steel members with the Mild Steel Weight Calculator. Comparing both helps you understand trade offs in self weight, cost and corrosion performance.
What if my supplier quotes weight per metre already?
You can still use this tool as a cross check. Enter their dimensions and compare calculated weight per piece with their catalogue figure. Small differences are normal; large differences may indicate a size or grade mismatch.