What is the formula for I-beam weight calculation?

For custom profiles: Weight (kg) = [2 × B × tf + (H − 2 × tf) × tw] × 10⁻⁶ × L × ρ × Q. The area has two parts — the flanges (2 × B × tf) and the web between them ((H − 2tf) × tw). For standard profiles (IPE, HEA, HEB, IPN, ISMB), published tabulated section areas from steel standards (EURONORM, DIN, IS 808:1989) are used, matching published steel-table reference weights.

How do you calculate I-beam weight in pounds per foot?

Switch the calculator to Imperial units and read lb/ft directly. For a quick conversion: kg/m × 0.672 = lb/ft. Example: ISMB 200 = 25.40 kg/m × 0.672 = 17.07 lb/ft. For manual calculation: convert mm² area × 10⁻⁶ × density_kg/m³ × 2.20462 lb/kg × 0.3048 m/ft. The calculator does this automatically — toggle the unit switch at the top of the input panel.

I Beam Weight Calculator

Profile

Material

Height (H)

Flange Width (B)

Web Thickness (tw)

Flange Thickness (tf)

Length

Quantity

Cost estimate

Use price per kg for the selected units.

Custom I-Beam · Mild Steel (MS)

160 × 81 (tw=7.7, tf=11.7) mm · 1 m each

Total weight

23.14kg

51.01 lb

Weight Breakdown

Linear weight, dimensions, and material details

Weight per meter

23.136kg/m

15.547 lb/ft

Weight per foot

15.547lb/ft

23.136 kg/m

Cross-section area

2,947.22 mm²

4.5682 in²

Volume per piece

2,947.22 cm³

179.8503 in³

Formula Used

Rectangular approximation for custom I-beam weight

Cross-section area: 2 × B × tf + (H − 2 × tf) × tw

Weight (kg) = Area × 10⁻⁶ × Lₘ × ρ × Q

H = height (mm) · B = flange width (mm) · tw = web thickness (mm) · tf = flange thickness (mm) · Lₘ = length (m) · ρ = density (kg/m³) · Q = quantity

Current values applied

2 × 81 × 11.7 + (160 − 2 × 11.7) × 7.7

Rectangular approximation (no root radii or taper) · Density (ρ) = 7850 kg/m³ (Mild Steel (MS))

How to Use the I-Beam Weight Calculator

Calculate I-beam and H-beam weight in seconds with these 4 simple steps

Select Profile Type

Choose from 5 standard profiles — IPE, HEA, HEB, IPN, or ISMB — with 70+ auto-filled sizes. Or pick Custom to enter your own dimensions.

Enter Dimensions & Quantity

Enter height (H), flange width (B), web thickness (tw), and flange thickness (tf) in mm or in. Toggle metric/imperial anytime. Standard profiles auto-fill these fields.

Select Material Grade

Choose Mild Steel (7,850 kg/m³), SS 304 (8,000), EN8 (7,850), Aluminum (2,700), Brass (8,530), or Copper (8,960). Or use Custom Density for other alloys.

Review the Results

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

I-Beam Weight Calculation Formula

Tabulated section areas for standard profiles, rectangular approximation for custom

Weight (kg) = A × 10⁻⁶ × L × ρ × Q

A = cross-section area (mm²) · L = length (m) · ρ = density (kg/m³) · Q = quantity

Cross-Section Area Breakdown

Flanges

2 × B × tf

Web

(H − 2tf) × tw

Total Area

Flanges + Web

Weight

Area × 10⁻⁶ × L × ρ × Q

Worked Example — ISMB 200, Mild Steel, 1 m:

ISMB 200 tabulated section area (IS 808:1989) = 3,236 mm²
Weight = 3,236 × 10⁻⁶ × 1 × 7,850
Weight = 25.40 kg (or 56.00 lb)

Standard profiles use published section areas from steel tables (IS 808:1989, EURONORM, DIN 1025-1). Custom profiles use the rectangular approximation formula above.

Standard I-Beam Profile Types

IPE, HEA, HEB, IPN, and ISMB — understand the differences at a glance

Standard	Range	Flange	Typical Use
IPEEuropean I-Beams	80 – 600	Parallel (narrow)	Beams in buildings, bridges, general structural
HEAWide Flange Light	100 – 1000	Wide parallel (light)	Columns, frames, where wide flange adds lateral stability
HEBWide Flange Medium	100 – 1000	Wide parallel (heavy)	Heavy columns, crane girders, high load-bearing
IPNEuropean Standard Beams	80 – 600	Tapered (sloped)	Traditional structures, retrofits, secondary beams
ISMBIndian Standard Medium Beams	100 – 600	Tapered (sloped)	Indian construction per IS 808:1989

Example Calculations

Real-world I-beam weight examples for common materials and profiles

Mild Steel ISMB 200, 1 m

ISMB 200: H=200, B=100, tw=5.7, tf=10.8 mm · Length 1 m

Mild Steel (7,850 kg/m³)

25.40 kg/m · 17.07 lb/ft

Result

25.40 kg

Mild Steel IPE 300, 3 m

IPE 300: H=300, B=150, tw=7.1, tf=10.7 mm · Length 3 m

Mild Steel (7,850 kg/m³)

42.23 kg/m · 28.38 lb/ft

Result

126.70 kg

SS 304 HEA 200, 2 m

HEA 200: H=190, B=200, tw=6.5, tf=10 mm · Length 2 m

Stainless Steel SS 304 (8,000 kg/m³)

43.04 kg/m · 28.93 lb/ft

Result

86.08 kg

Aluminum IPE 200, 10 ft

IPE 200: H=200, B=100, tw=5.6, tf=8.5 mm · Length 10 ft

Aluminum (2,700 kg/m³)

5.17 lb/ft · 7.70 kg/m

Result

51.68 lb

Material Densities for I-Beam Weight

Standard density values for common I-beam materials

Material	Density (kg/m³)	Common Use
Mild Steel (MS)	7,850	General structural, ISMB beams per IS 808
Stainless Steel (SS 304)	8,000	Corrosion-resistant structures, food/pharma
EN8 Steel	7,850	Medium carbon steel — shafts, axles
Aluminum	2,700	Lightweight structural, curtain walls
Brass	8,530	Decorative, architectural, fixtures
Copper	8,960	Electrical busbars, marine hardware

Tips for Accurate I-Beam Weight Estimation

Practical advice for getting reliable beam weight estimates

For billing, confirm whether you need theoretical or actual weight. IS 808 allows ±2.5% tolerance due to rolling variations. Use the calculator for estimates and the weighbridge reading for final billing.

Aluminum I-beams are about 65% lighter than mild steel (2,700 vs 7,850 kg/m³). When substituting aluminum for steel, the weight savings are significant — but aluminum has different strength properties that affect structural design.

Stainless steel (SS 304) beams are about 2% heavier than MS of the same dimensions. For a 100 kg MS equivalent, the SS version weighs ~102 kg — important for procurement and lifting plans.

IPE, HEA, and HEB beams with the same '200' designation vary dramatically: IPE 200 = 22.4 kg/m, HEA 200 = 42.3 kg/m, HEB 200 = 61.3 kg/m. The flange width is the difference — always verify the exact profile designation before ordering.

Common Mistakes to Avoid

Don't let these errors cost you time and money

Using the wrong profile for your beam type

IPE, HEA, and HEB beams with the same nominal size have very different flange widths. IPE 200 has B=100 mm; HEB 200 has B=200 mm — making the HEB over twice as heavy. Always verify your beam's actual profile designation, not just the height.

Confusing web thickness (tw) with flange thickness (tf)

The web and flanges have different thicknesses in all standard I-beams. For ISMB 200, tw = 5.7 mm and tf = 10.8 mm. Swapping these values changes the weight significantly — the flange is nearly twice as thick as the web. Always check the beam spec for the correct dimensions.

Mixing profile standards

An IPE 200 is not interchangeable with an HEA 200 or ISMB 200. Different standards have different H, B, tw, and tf values. Confirm which standard your project specification requires before ordering.

Using theoretical weight for billing

This calculator provides theoretical weight. IS 808 allows ±2.5% tolerance on actual weight due to rolling variations. For billing and procurement, confirm with the mill test certificate or weighbridge measurement.

Frequently Asked Questions

Common questions about I-beam and H-beam weight calculation

For standard profiles (IPE, HEA, HEB, IPN, ISMB), the calculator uses published tabulated section areas from official steel standards, so results match engineering reference tables. For custom profiles, use the rectangular approximation: Area = 2 × B × tf + (H − 2 × tf) × tw, then Weight = Area × 10⁻⁶ × length (m) × density (kg/m³) × quantity. For mild steel (7,850 kg/m³), ISMB 200 (tabulated area 3,236 mm²) × 1 m = 25.40 kg. Select a standard profile or enter custom dimensions above for instant results.

Set length to 1 meter. For standard profiles, the calculator uses tabulated section area: kg/m = tabulatedArea_mm² × 10⁻⁶ × density_kg/m³. Example: ISMB 200 tabulated area = 3,236 mm² (IS 808), weight per meter = 3,236 × 10⁻⁶ × 7,850 = 25.40 kg/m. For custom profiles: kg/m = [2 × B × tf + (H − 2 × tf) × tw] × 10⁻⁶ × density. The calculator shows weight per meter in the breakdown section — set length to 1 m to read kg/m directly from the total weight.

IPE (European I-beams) have narrow, parallel flanges — lighter and taller for a given weight, ideal for beams in bending. HEA (wide flange, light series) have wider parallel flanges for column stability, heavier than IPE of the same nominal height. HEB (wide flange, medium/heavy series) have the widest flanges of the three, designed for heavy load-bearing. For the same nominal '200' size: IPE 200 ≈ 22.4 kg/m, HEA 200 ≈ 42.3 kg/m, HEB 200 ≈ 61.3 kg/m. HEA/HEB are H-beams; IPE is a classic I-beam.

ISMB (Indian Standard Medium Beam) is defined by IS 808:1989 and is the standard I-beam profile used in Indian construction. (Note: IS 808:2021 is the current edition; this calculator uses the widely-referenced 1989 edition data. Confirm with your supplier for current-production beams.) ISMB beams have tapered flanges (sloped inner face), unlike the parallel flanges of IPE/HEA/HEB. Common sizes range from ISMB 100 (11.5 kg/m) to ISMB 600 (122.6 kg/m). ISMB 200 (25.4 kg/m), ISMB 250 (37.3 kg/m), ISMB 300 (44.2 kg/m), and ISMB 400 (61.6 kg/m) are the most commonly used sizes in Indian building construction. The calculator includes all ISMB sizes from 100 to 600 with tabulated section areas per IS 808.

Mild steel (MS) I-beams use a density of 7,850 kg/m³ (7.85 g/cm³), the standard value per IS 808:1989 and international steel standards. In imperial units, this is approximately 490 lb/ft³. This is the density for all common structural steel grades including IS 2062 Fe 410, ASTM A36, and S275. Stainless steel SS 304 has a slightly higher density of 8,000 kg/m³. EN8 steel has the same density as MS (7,850 kg/m³).

Yes. Select 'Aluminum' from the material dropdown — it uses a density of 2,700 kg/m³. Aluminum I-beams are about 65% lighter than mild steel of the same dimensions. For an IPE 200 aluminum beam in mild steel: 22.4 kg/m; in aluminum: 22.4 × 2700/7850 ≈ 7.7 kg/m. This weight difference is critical for structural applications, transport, and handling. Note that aluminum I-beams have different standard extrusion sizes than steel — check with your supplier for available aluminum profiles.

For standard profiles (IPE, HEA, HEB, IPN, ISMB), this calculator uses published tabulated section areas from official steel standards (EURONORM, DIN, IS 808), so results match engineering reference tables. For custom profiles, a rectangular approximation formula is used that ignores root radii and flange taper — these are typically 3–5% lighter than actual rolled sections. For hot-rolled steel I-beams per IS 808:1989, actual delivered weight can vary up to ±2.5% from theoretical due to rolling tolerances. For critical applications involving lifting, structural design, or billing, always confirm with the mill test certificate or weighbridge measurement from your supplier.

This calculator supports 5 international I-beam standards with 100+ sizes: IPE (80–600, 18 sizes) for European parallel-flange I-beams; HEA (100–1000, 24 sizes) for wide flange light columns; HEB (100–1000, 24 sizes) for wide flange medium/heavy sections; IPN (80–600, 21 sizes) for European tapered-flange standard beams per DIN 1025-1; ISMB (100–600, 14 sizes) for Indian Standard Medium Beams per IS 808:1989. Each standard has different H, B, tw, tf values and section areas — select your required standard from the Profile toggle.

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Last updated May 24, 2026

I Beam Weight Calculator

Weight Breakdown

Formula Used

How to Use the I-Beam Weight Calculator

Select Profile Type

Enter Dimensions & Quantity

Select Material Grade

Review the Results

I-Beam Weight Calculation Formula

Cross-Section Area Breakdown

Standard I-Beam Profile Types

Example Calculations

Material Densities for I-Beam Weight

Tips for Accurate I-Beam Weight Estimation

Common Mistakes to Avoid

Frequently Asked Questions

Embed I Beam Weight Calculator

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