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Calculate MS plate, MS pipe, square tube, TMT rod, flat bar and angle weight from dimensions, quantity and density, with quick Indian steel weight charts for common sizes.
Inputs
1
Material and section
2
Quantity and cost
Applied only to the order weight and cost.
How to use this calculator: Steel & Metal Weight Calculator
Calculate MS plate, MS pipe, square tube, TMT rod, flat bar and angle weight from dimensions, quantity and density, with quick Indian steel weight charts for common sizes. The example below is calculated by this page's real engine from the displayed inputs.
1Select steel or another metal, then choose rod, square bar, pipe, plate, flat or angle.
2Use millimetres for section dimensions and metres for piece length.
3Enter piece count, cutting/lap percentage and an optional current ₹/kg rate.
4Use net weight for engineering quantity and order weight for procurement planning.
Input guide and example values
Use values from the same measurement basis and time period. Conditional fields appear only when the related option is selected.
Input
Example value
Why it matters
Material
Mild / carbon steel — 7,850 kg/m³
Select the option that matches the real installation or scenario.
Section
Round bar / TMT rod
Select the option that matches the real installation or scenario.
Diameter / square side
8 mm
Measured or known diameter / square side used by the calculation engine.
Length per piece
12 m
Measured or known length per piece used by the calculation engine.
Number of pieces
1
Measured or known number of pieces used by the calculation engine.
Cutting / lap allowance
3 %
Applied only to the order weight and cost.
Material rate
65 ₹/kg
Optional input; leave the supplied default only when it matches your case.
Formula, derivation and worked example
Steel and metal weight is a volume calculation, not a lookup guess. Select the material density and section, enter nominal dimensions and length, and the calculator derives area, kg per metre, piece weight, net quantity, order allowance and cost. The same page directly answers high-volume Indian queries such as 8 mm rod weight and MS plate weight.
Weight = density × cross-sectional area × length
Steel round bar: kg/m = D² / 162.28
MS plate: kg = width(m) × length(m) × thickness(mm) × 7.85
Angle area ≈ t × (leg A + leg B − t)
Order weight = net weight × (1 + allowance/100)
Substitution steps
1. Section area
π/4 × D²
= 50.265 mm²
2. Unit mass
7850 × area ÷ 10⁶
= 0.3946 kg/m
3. Per piece
kg/m × piece length
= 4.735 kg
4. Net quantity
piece weight × quantity
= 4.735 kg
5. Order quantity
net × (1 + 3%)
= 4.877 kg
Computed example results
Net metal weight
4.74 kg
0.005 tonne · Mild / carbon steel
Order weight with allowance
4.88 kg
3% added to net weight
Unit weight
0.395 kg/m
Weight per piece
4.74 kg
Cross-sectional area
50.27 mm²
Total length
12 m
D²/162.28 check
0.394 kg/m
Estimated material cost
₹317
at ₹65/kg on order weight
Understanding the result
Read the main result together with supporting checks, assumptions, limits and intermediate values.
For a manual check, repeat the first equation, confirm the units and change one input at a time.
Common mistakes when using Steel & Metal Weight Calculator
Do not mix units for Diameter / square side (mm), Length per piece (m), Cutting / lap allowance (%). A unit mismatch changes the input magnitude even when the typed number looks reasonable.
Do not leave Material on the default choice unless that choice matches the real scenario; the selected option can change the calculation path or factor.
Do not replace the displayed Weight = density × cross-sectional area × length relationship with a different convention without also changing the underlying assumptions; compare like-for-like methods when checking the result.
Do not treat Net metal weight = 4.74 kg from the worked example as a universal answer. It belongs to the displayed example inputs and must be recalculated for the actual case.
Next logical calculator
Continue with Rebar Calculator
Rebar Calculator is directly connected from Steel & Metal Weight Calculator as a source-defined continuation or comparison.
Using D²/162.28, an 8 mm TMT rod weighs 0.394 kg per metre. A standard 12 m bar therefore weighs about 4.73 kg, and one metric tonne contains about 211 full 12 m bars before rolling tolerance.
For a bar bending schedule, calculate the centre-line cutting length of each bar rather than using the stock length. Add laps, hooks, bends and approved wastage separately.
MS plate weight formula
For mild-steel plate with width and length in metres and thickness in millimetres, weight in kilograms is width × length × thickness × 7.85. A 1 m × 1 m × 8 mm MS plate is therefore 62.8 kg.
Use nominal weight for estimates and purchase planning, then check the mill certificate and weighbridge record where billing or lifting plans require actual mass.
From net weight to order quantity
Net calculated mass excludes cutting loss, laps, off-cuts and rolling tolerance. The order allowance field adds a transparent percentage without changing the engineering net quantity.
For fabricated structures, prepare a member-wise bill of materials and separate fasteners, cleats, base plates, galvanizing and weld metal instead of hiding them inside a large wastage factor.
MS plate weight chart: kg per square metre
For mild-steel plate, the quickest site formula is weight (kg) = width (m) × length (m) × thickness (mm) × 7.85. Therefore the weight per square metre is simply thickness × 7.85. A 6 mm MS plate is about 47.1 kg/m², an 8 mm plate is 62.8 kg/m² and a 10 mm plate is 78.5 kg/m².
Use the calculator above when the plate is not exactly one square metre, when there are several pieces, or when a cutting allowance and material rate must be included. For procurement and lifting, confirm the supplier or mill certificate because rolling tolerance, coating and fabrication additions can change actual mass.
MS pipe weight chart and pipe weight formula
Round MS pipe weight is calculated from the steel area in the pipe wall: area = π/4 × (OD² − ID²), where ID = OD − 2 × wall thickness. Multiplying that area by 7,850 kg/m³ gives kilograms per metre. This is more reliable than using nominal pipe names alone because two pipes with the same nominal bore can have different outside diameters or wall thicknesses.
The quick-reference rows below use nominal outside diameter and wall thickness only as worked planning examples. For ERW, GI, seamless or schedule pipe procurement, use the actual OD and thickness from the manufacturer table or purchase specification.
MS square tube and rectangular hollow-section weight
For a square or rectangular hollow section, subtract the inner hollow area from the outer rectangle and multiply by steel density and length. A simple sharp-corner calculation is useful for estimating, while manufacturer catalogue mass is preferred for final purchase because real hollow sections include corner radii and manufacturing tolerances.
Use the square-section option in the calculator for solid square bar. For hollow square tube, use the reference chart below as a planning guide or calculate from outside width, outside height and wall thickness using the hollow-section area formula.
TMT bar weight chart for estimation and BBS checks
For reinforcement steel at 7,850 kg/m³, the familiar Indian rule is kg/m ≈ D²/162.28, with D in millimetres. This gives about 0.394 kg/m for 8 mm bar, 0.616 kg/m for 10 mm, 0.887 kg/m for 12 mm, 1.578 kg/m for 16 mm and 2.465 kg/m for 20 mm.
For a bar bending schedule, multiply unit weight by the actual centre-line cutting length, not just the stock-bar length. Laps, hooks, bends and approved wastage should be accounted for explicitly so the calculated net reinforcement quantity stays traceable.
Formula
Weight = density × cross-sectional area × length
Steel round bar: kg/m = D² / 162.28
MS plate: kg = width(m) × length(m) × thickness(mm) × 7.85
Angle area ≈ t × (leg A + leg B − t)
Order weight = net weight × (1 + allowance/100)
Steel and metal weight is a volume calculation, not a lookup guess. Select the material density and section, enter nominal dimensions and length, and the calculator derives area, kg per metre, piece weight, net quantity, order allowance and cost. The same page directly answers high-volume Indian queries such as 8 mm rod weight and MS plate weight.
Steel weight quick-reference chart: TMT, MS plate, pipe and square tube
Planning values use 7,850 kg/m³. Pipe rows use the shown OD × wall thickness; square-tube rows use a sharp-corner hollow-section approximation. Verify manufacturer tables for procurement.
Section / size
Reference dimensions
Approx. unit weight
Quick use
TMT bar 8 mm
D = 8 mm
0.394 kg/m · 4.73 kg/12 m
Rebar / BBS
TMT bar 10 mm
D = 10 mm
0.616 kg/m · 7.39 kg/12 m
Rebar / BBS
TMT bar 12 mm
D = 12 mm
0.887 kg/m · 10.65 kg/12 m
Rebar / BBS
TMT bar 16 mm
D = 16 mm
1.578 kg/m · 18.94 kg/12 m
Rebar / BBS
TMT bar 20 mm
D = 20 mm
2.465 kg/m · 29.58 kg/12 m
Rebar / BBS
MS plate 3 mm
1 m² × 3 mm
23.55 kg/m²
Sheet / plate estimate
MS plate 5 mm
1 m² × 5 mm
39.25 kg/m²
Sheet / plate estimate
MS plate 6 mm
1 m² × 6 mm
47.10 kg/m²
Sheet / plate estimate
MS plate 8 mm
1 m² × 8 mm
62.80 kg/m²
Sheet / plate estimate
MS plate 10 mm
1 m² × 10 mm
78.50 kg/m²
Sheet / plate estimate
MS plate 12 mm
1 m² × 12 mm
94.20 kg/m²
Sheet / plate estimate
MS pipe
21.3 mm OD × 2.6 mm
1.20 kg/m
Planning example
MS pipe
26.9 mm OD × 2.6 mm
1.56 kg/m
Planning example
MS pipe
33.7 mm OD × 3.2 mm
2.41 kg/m
Planning example
MS pipe
42.4 mm OD × 3.2 mm
3.09 kg/m
Planning example
MS pipe
48.3 mm OD × 3.2 mm
3.56 kg/m
Planning example
MS pipe
60.3 mm OD × 3.6 mm
5.03 kg/m
Planning example
MS square tube
25 × 25 × 2 mm
1.44 kg/m
Sharp-corner estimate
MS square tube
40 × 40 × 2 mm
2.39 kg/m
Sharp-corner estimate
MS square tube
50 × 50 × 2 mm
3.01 kg/m
Sharp-corner estimate
MS square tube
50 × 50 × 3 mm
4.43 kg/m
Sharp-corner estimate
MS square tube
75 × 75 × 3 mm
6.78 kg/m
Sharp-corner estimate
MS square tube
100 × 100 × 4 mm
12.06 kg/m
Sharp-corner estimate
Formulas explained
m = ρAL
Every solid-section result comes from material density multiplied by the true cross-sectional area and total length.
m
mass in kg
ρ
selected material density in kg/m³
A
cross-sectional area in m²
L
total length in m
Catalogue mass can differ because rolled-section radii, tolerances, coatings and alloy density are not fully represented by nominal dimensions.
Steel round bar kg/m = D² / 162.28
Substituting 7,850 kg/m³ and the circular area πD²/4 into ρA gives the familiar Indian bar-bending-schedule rule.
D
nominal bar diameter in mm
Use the density formula for aluminium, copper, brass or stainless round bars; D²/162.28 is specifically for 7,850 kg/m³ steel.
MS plate kg = W × L × t × 7.85
For dimensions in metres and thickness in millimetres, the steel density conversion reduces to a convenient factor of 7.85.
W
plate width in m
L
plate length in m
t
plate thickness in mm
8 mm TMT rod quick answer
8 mm steel bar = 0.394 kg/m, about 4.73 kg for a 12 m bar and roughly 211 full 12 m bars per tonne, using 7,850 kg/m³.
8 mm MS plate quick answer
An 8 mm mild-steel plate weighs 62.8 kg per square metre. Multiply 62.8 by the plate area in m² and quantity.
Density matters for metal weight
The same section weighs very differently in aluminium, brass, copper and stainless steel. Always select the material before comparing transport or fabrication loads.
MS plate quick rule
For 1 m² of mild-steel plate, weight in kg is thickness in mm × 7.85. Examples: 5 mm = 39.25 kg/m², 8 mm = 62.8 kg/m² and 12 mm = 94.2 kg/m².
MS pipe needs OD and wall thickness
Nominal bore alone is not enough for an accurate pipe weight. Use the actual outside diameter and wall thickness because schedule and manufacturing series can change both dimensions.
Square tube catalogue mass can differ
A sharp-corner hollow-section formula is a good estimate, but rolled corner radii and tolerances mean final procurement should use the manufacturer mass-per-metre table.
Worked example
1For 40 TMT bars of 12 mm diameter and 12 m length, unit weight = 12²/162.28 = 0.887 kg/m.
2Net weight = 0.887 × 12 × 40 = 425.9 kg.
3With 3% allowance, procurement weight = 438.7 kg.
Assumptions
Nominal dimensions and the selected reference density are used.
Pipe diameter is outside diameter and wall thickness is uniform.
Angle root radii and rolled-section fillets are ignored; use manufacturer tables for final procurement.
Tips
Use the actual cutting length from the bar bending schedule, not only the 12 m stock length.
Confirm whether a supplier quote includes GST, freight, cutting and galvanizing.
Use certified catalogue weights for standard channels, beams and proprietary hollow sections.
Warnings
Do not use nominal metal weight as a lifting-plan weight when certified actual mass is required.
Galvanizing, paint, weld metal, bolts and fabrication plates are not automatically included.
Standards & references
IS 1786: High-strength deformed steel bars and wires
IS 2062: Hot-rolled medium and high-tensile structural steel
IS 2502: Bending and fixing of bars for concrete reinforcement
Frequently asked questions
What is the weight of an 8 mm steel rod?+
An 8 mm steel rod weighs about 0.394 kg per metre or 4.73 kg for a 12 m bar. One tonne is approximately 211 full 12 m bars.
How do I calculate MS plate weight?+
With width and length in metres and thickness in millimetres, multiply width × length × thickness × 7.85. For example, a 1 m × 1 m × 8 mm plate weighs 62.8 kg.
Where does the D²/162 formula come from?+
It is density × circular area expressed for steel density 7,850 kg/m³ and diameter in millimetres. The precise constant is about 162.28.
Is TMT steel heavier than mild steel?+
Not materially for quantity calculations. Both are normally taken as 7,850 kg/m³; strength and surface profile differ, while nominal mass follows the same density.
Does the calculator include steel wastage?+
It reports both net mass and order mass. The allowance field applies only to the order quantity and estimated cost.
How much does an 8 mm MS plate weigh per square metre?+
Using 7,850 kg/m³ for mild steel, an 8 mm plate weighs about 62.8 kg per square metre. Multiply 62.8 by the actual plate area in m² for the nominal plate mass.
How do I calculate MS pipe weight per metre?+
Use the actual outside diameter and wall thickness. Find the metal cross-sectional area from π/4 × (OD² − ID²), convert mm² to m², then multiply by 7,850 kg/m³ for kilograms per metre.
How do I calculate square tube weight per metre?+
Subtract the hollow inside area from the outside rectangular area and multiply the remaining steel area by 7,850 kg/m³. Manufacturer tables are preferred for final procurement because real tubes have corner radii and tolerances.
Planning estimate based on nominal dimensions and reference density. Confirm mill tolerances, section tables, material grade and supplier weighment for purchase, fabrication and lifting.