What is the formula for MS square bar weight calculation?

For mild steel (MS), the simplified formula is: Weight (kg) = Side² (mm) × Length (m) × 0.00785. The factor 0.00785 comes from: density (7,850 kg/m³) × 10⁻⁶ = 0.00785. Example: 12 mm MS square bar, 6 m long → 144 × 6 × 0.00785 = 6.78 kg. For imperial: Weight (lb) = Side² (in) × Length (ft) × 3.40 (since 7,850 kg/m³ ≈ 490 lb/ft³ and adjusting for unit conversion).

What is the density of mild steel in kg/m³?

Mild steel (MS) has a density of 7,850 kg/m³ or 7.85 g/cm³. This is the standard value used across the steel industry in India and globally. In imperial units, mild steel density is approximately 490 lb/ft³. EN8 steel has the same density as MS (7,850 kg/m³), while stainless steel SS 304 is slightly higher at 8,000 kg/m³.

How much does a 10mm MS square bar weigh per meter?

A 10 mm MS square bar weighs 0.785 kg per meter (or 0.528 lb/ft). Calculation: cross-section area = 10² = 100 mm², weight per meter = 100 × 10⁻⁶ × 7,850 = 0.785 kg/m. For common sizes: 12 mm = 1.13 kg/m, 16 mm = 2.01 kg/m, 20 mm = 3.14 kg/m, 25 mm = 4.91 kg/m. Use the calculator with length set to 1 m to find the exact kg/m value for any side dimension.

How do you convert square bar weight from kg to pounds?

Multiply kg by 2.20462 to get pounds. For example, 10 kg = 22.05 lb. The calculator displays both kg and lb results automatically — no manual conversion needed. It also shows weight per meter (kg/m) and weight per foot (lb/ft) side by side for easy reference, regardless of which unit system you're using for input.

Does stainless steel square bar weigh more than mild steel?

Yes, stainless steel (SS 304) is slightly heavier than mild steel. SS 304 density is 8,000 kg/m³ compared to MS at 7,850 kg/m³ — about 1.9% heavier. For a 20 mm square bar, 1 meter long: MS weight = 3.14 kg, SS 304 weight = 3.20 kg. The difference is small for individual pieces but significant for bulk orders — a 1,000 kg MS order would be about 1,019 kg in SS 304.

What sizes of MS square bars are commonly available in India?

MS square bars in India are commonly available from 6 mm to 75 mm, with standard lengths of 6 meters (occasionally 12 meters for larger sizes). Common sizes include: 6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 32 mm, 40 mm, 50 mm, 63 mm, and 75 mm. These are manufactured as per IS 1731 standards. The calculator works with any side dimension — enter your exact size to get the weight.

Square Bar Weight Calculator

Units

Material

Side (mm)

Length (m)

Quantity

Cost estimate

Use price per kg for the selected units.

Square Bar · Mild Steel (MS)

10 mm side · 1 m each

Total weight

0.79kg

1.73 lb

Weight Breakdown

Linear weight, dimensions, and material details

Weight per meter

0.785kg/m

0.528 lb/ft

Weight per foot

0.528lb/ft

0.785 kg/m

Cross-section area

100 mm²

0.155 in²

Volume per piece

100 cm³

6.1024 in³

Formula Used

The exact formula applied for square bar weight

Square Bar

Weight (kg) = S² × 10⁻⁶ × L × ρ × Q

S = side (mm) · S² = cross-section area (mm²) · L = length (m) · ρ = density (kg/m³) · Q = quantity

Density (ρ) = 7850 kg/m³ (Mild Steel (MS))

How to Use the Square Bar Weight Calculator

Calculate square bar weight in seconds with these 4 simple steps

Select Material

Choose from 6 preset materials — Mild Steel (MS, 7,850 kg/m³), Stainless Steel SS 304 (8,000 kg/m³), EN8 Steel (7,850 kg/m³), Aluminum (2,700 kg/m³), Brass (8,530 kg/m³), and Copper (8,960 kg/m³). Use Custom Density for any other material or alloy.

Enter Dimensions & Quantity

Input the side dimension and length in metric (mm, m) or imperial (in, ft). The calculator converts between units automatically. Adjust quantity for batch orders and optionally enable cost estimation per kg or lb.

Review the Results

Get total weight in kg and lb, weight per meter (kg/m), weight per foot (lb/ft), cross-section area (mm²), volume (cm³), and optional cost estimate in your selected currency.

Use the Formula Reference

The results card shows the exact formula used with your current values — side² × 10⁻⁶ × length × density × quantity — so you can verify or replicate the calculation manually.

Square Bar Weight Calculation Formula

The fundamental formula and how it works

Weight (kg) = S² × 10⁻⁶ × L × ρ × Q

S = side (mm) · S² = cross-section area (mm²) · 10⁻⁶ converts mm² → m² · L = length (m) · ρ = density (kg/m³) · Q = quantity

Worked Example:

A 10 mm MS square bar, 1 meter long, quantity 1:

Cross-section area = 10² = 100 mm²
Weight = 100 × 10⁻⁶ × 1 × 7,850 × 1
Weight = 0.785 kg (or 1.73 lb)

Example Calculations

Real-world square bar weight examples for common materials and sizes

10 mm MS Square Bar, 1 m

Side 10 mm · Length 1 m

Mild Steel (7,850 kg/m³)

0.785 kg/m · 0.528 lb/ft

Result

0.785 kg

25 mm Aluminum Square Bar, 2 m

Side 25 mm · Length 2 m

Aluminum (2,700 kg/m³)

1.688 kg/m · 1.134 lb/ft

Result

3.375 kg

1/2 in Brass Square Bar, 3 ft

Side 0.5 in · Length 3 ft

Brass (8,530 kg/m³)

0.925 lb/ft · 1.376 kg/m

Result

2.77 lb

40 mm SS 304 Square Bar, 1.5 m

Side 40 mm · Length 1.5 m

Stainless Steel SS 304 (8,000 kg/m³)

12.80 kg/m · 8.60 lb/ft

Result

19.20 kg

Material Densities for Square Bar Weight

Standard density values for common square bar materials

Material	Density (kg/m³)	Common Use
Mild Steel (MS)	7,850	General construction, fabrication, structural
Stainless Steel (SS 304)	8,000	Corrosion-resistant, food grade, medical
EN8 Steel	7,850	Medium carbon steel, shafts, axles, studs
Aluminum	2,700	Lightweight, aerospace, automotive, frames
Brass	8,530	Decorative, plumbing fittings, electrical
Copper	8,960	Electrical conductors, busbars, plumbing

Tips for Accurate Square Bar Weight Estimation

Practical advice for getting the most accurate weight estimates

For MS square bars, always confirm whether you need theoretical weight or actual weight. Indian standard IS 1731 allows a ±3% tolerance on actual weight vs theoretical weight for hot-rolled bars.

Aluminum is about 65% lighter than mild steel (2,700 vs 7,850 kg/m³). If you're substituting aluminum for steel, the same dimensions will weigh roughly one-third as much.

Stainless steel (SS 304) is approximately 2% heavier than mild steel. For a 100 kg MS order, the SS equivalent would be about 102 kg — important for procurement and cost estimation.

For galvanized square bars, the zinc coating adds negligible weight (typically less than 0.5%). Use the base steel density for estimates — the coating weight is within manufacturing tolerance.

Common Mistakes to Avoid

Don't let these errors cost you time and money

Confusing side length with cross-section area

The calculator uses the side dimension (one edge of the square cross-section). The area is side². If you enter the cross-section area instead of the side, your weight will be wildly inflated.

Mixing metric and imperial units

A 10 mm side and a 1 inch side give very different results (1 in = 25.4 mm, so the 1 in bar has 6.45× more cross-section area). Always verify your unit system before entering dimensions.

Assuming all steel has the same density

Mild steel (7,850 kg/m³), stainless steel (8,000 kg/m³), and EN8 (7,850 kg/m³) have different densities. SS 304 is about 2% heavier than MS for the same dimensions — significant for large orders.

Forgetting to multiply by quantity

The weight shown is for the entered quantity. If you need 50 bars, set quantity to 50 — don't manually multiply, or you risk calculation errors on large orders.

Frequently Asked Questions

Common questions about square bar weight calculation

Multiply the cross-section area (side²) by the length and material density. Formula: Weight (kg) = Side (mm)² × 10⁻⁶ × Length (m) × Density (kg/m³) × Quantity. For example, a 10 mm MS square bar, 1 meter long: Area = 100 mm², Weight = 100 × 10⁻⁶ × 1 × 7,850 = 0.785 kg. Use the calculator above — select your material, enter side and length, and get instant results in kg and lb.

Aluminum square bar weight uses the same formula but with aluminum's lower density of 2,700 kg/m³. Formula: Weight (kg) = Side² (mm) × 10⁻⁶ × Length (m) × 2,700. For a 25 mm aluminum square bar, 2 meters long: Area = 625 mm², Weight = 625 × 10⁻⁶ × 2 × 2,700 = 3.375 kg. Aluminum is about 65% lighter than mild steel for the same dimensions. Select 'Aluminum' from the material dropdown in the calculator above.

MS (mild steel) and EN8 steel have the same density — 7,850 kg/m³ — so a square bar of the same dimensions weighs exactly the same in both materials. The difference is in mechanical properties: EN8 is a medium carbon steel (0.35–0.45% carbon) with higher tensile strength (700–850 N/mm²) compared to MS (400–550 N/mm²). EN8 is used for shafts, axles, and studs where strength matters more than weight.

For a hollow square bar (square tube), subtract the inner hollow area from the outer: Weight = (S_outer² − S_inner²) × 10⁻⁶ × Length × Density. Where S_inner = S_outer − 2 × wall thickness. For example, a 50 mm outer, 4 mm wall MS hollow square bar: S_inner = 42 mm, Area = 50² − 42² = 2,500 − 1,764 = 736 mm², Weight per meter = 736 × 10⁻⁶ × 7,850 = 5.78 kg/m. This calculator is for solid square bars only. For hollow sections, use a dedicated square tube weight calculator.

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Last updated May 23, 2026

Square Bar Weight Calculator

Weight Breakdown

Formula Used

How to Use the Square Bar Weight Calculator

Select Material

Enter Dimensions & Quantity

Review the Results

Use the Formula Reference

Square Bar Weight Calculation Formula

Example Calculations

Material Densities for Square Bar Weight

Tips for Accurate Square Bar Weight Estimation

Common Mistakes to Avoid

Frequently Asked Questions

Embed Square Bar Weight Calculator

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