How much does a 20 ft #4 rebar weigh?

A 20 ft #4 rebar weighs 13.36 lbs (0.668 lb/ft × 20 ft).

How much does a 40 ft #5 rebar weigh?

A 40 ft #5 rebar weighs 41.72 lbs (1.043 lb/ft × 40 ft).

What is the most common rebar size for driveways?

#3 and #4 rebar are most commonly used for residential driveways. #4 (1/2 inch diameter, 0.668 lb/ft) is the industry standard for 4-inch thick residential driveways.

What is the weight of #8 rebar per foot?

#8 rebar weighs 2.670 lb per foot (3.982 kg/m). A 20 ft bar weighs 53.40 lbs and a 40 ft bar weighs 106.80 lbs.

How is soft metric rebar size determined?

Soft metric sizes are simply conversions of US imperial sizes — the dimensions are identical, only the naming differs. For example, #4 imperial = #13 soft metric (since 12.7mm ≈ 13mm). No physical change is made to the bar.

Rebar Weight Chart – US Standard Sizes #2 – #18

Q: How much does #4 rebar weigh per foot?

#4 rebar weighs 0.668 lb per foot (0.996 kg/m). A standard 20 ft bar weighs 13.36 lbs and a 40 ft bar weighs 26.72 lbs.

Q: How much does #5 rebar weigh per foot?

#5 rebar weighs 1.043 lb per foot (1.556 kg/m). A standard 20 ft bar weighs 20.86 lbs and a 40 ft bar weighs 41.72 lbs.

Q: What does the rebar number mean?

The rebar number represents the diameter in eighths of an inch. So #4 rebar = 4/8 = 1/2 inch diameter, #8 rebar = 8/8 = 1 inch diameter, and so on.

Q: Does rebar grade affect weight?

No. Rebar grade (Grade 40, 60, 75, 80) refers to yield strength in ksi, not weight. Weight is determined solely by bar size (diameter), not grade. A #5 Grade 40 and #5 Grade 60 weigh exactly the same per foot.

Q: How many linear feet are in a ton of #4 rebar?

There are approximately 2,994 linear feet in one ton (2,000 lbs) of #4 rebar. Formula: 2000 ÷ 0.668 lb/ft = 2,994 ft.

Q: What ASTM standard covers rebar weight?

ASTM A615 is the primary standard for deformed and plain carbon-steel bars for concrete reinforcement in the US. It defines bar sizes, minimum yield strength, tensile strength, and weight tolerances.

Q: How do you calculate rebar weight?

Weight (lb/ft) = (D² × 2.67) / 4, where D is the nominal diameter in inches. Or use the shortcut: Weight (kg/m) = D²(mm) × 0.00617.

Rebar Weight Chart – US Standard Sizes #2 – #18

Rebar Weight Chart – US Standard Sizes #2 to #18 | ASTM A615 | ConcreteCalculate.com

ASTM A615 Reference

Rebar Weight Chart
US Standard Sizes #2 – #18

The most complete rebar weight reference for contractors, engineers, estimators, and construction students. Verified against ASTM A615 standards.

All US Standard Sizes Imperial & Metric 20 ft & 40 ft Bar Weights Worked Examples 📅 Last Updated: June 2026 Free PDF Download

Master Rebar Weight Chart – #2 to #18

All values per ASTM A615. Diameter, weight, cross-section area, and bar weights for standard 20 ft and 40 ft lengths.

📌

How to Read This Chart

Bar size number = diameter in eighths of an inch. So #4 = 4/8 = ½ inch diameter. The chart below gives all key weight and dimension data in one place.

Bar Size	Soft Metric	Diameter (in)	Diameter (mm)	Weight/Ft (lb)	Weight/m (kg)	20 ft Bar (lb)	40 ft Bar (lb)	Area (in²)	Area (mm²)
#2	#6	0.250	6.35	0.167	0.249	3.34	6.68	0.05	32
#3	#10	0.375	9.525	0.376	0.561	7.52	15.04	0.11	71
#4	#13	0.500	12.70	0.668	0.996	13.36	26.72	0.20	129
#5	#16	0.625	15.875	1.043	1.556	20.86	41.72	0.31	200
#6	#19	0.750	19.05	1.502	2.240	30.04	60.08	0.44	284
#7	#22	0.875	22.225	2.044	3.049	40.88	81.76	0.60	387
#8	#25	1.000	25.40	2.670	3.982	53.40	106.80	0.79	509
#9	#29	1.128	28.65	3.400	5.071	68.00	136.00	1.00	645
#10	#32	1.270	32.26	4.303	6.418	86.06	172.12	1.27	819
#11	#36	1.410	35.81	5.313	7.924	106.26	212.52	1.56	1006
#14	#43	1.693	43.00	7.650	11.410	153.00	306.00	2.25	1452
#18	#57	2.257	57.30	13.600	20.284	272.00	544.00	4.00	2581

★ Highlighted rows (#3–#6) are most commonly used in residential construction. Source: ASTM A615 Standard Specification for Deformed and Plain Carbon-Steel Bars.

Rebar Weight Per Foot Chart

Quick reference for the most common estimating calculation — weight per linear foot for all US bar sizes.

Bar Size	Weight per Foot (lb/ft)	Weight per 10 ft (lb)	Weight per 20 ft (lb)	Weight per 40 ft (lb)	Weight per 60 ft (lb)
#2	0.167	1.67	3.34	6.68	10.02
#3	0.376	3.76	7.52	15.04	22.56
#4	0.668	6.68	13.36	26.72	40.08
#5	1.043	10.43	20.86	41.72	62.58
#6	1.502	15.02	30.04	60.08	90.12
#7	2.044	20.44	40.88	81.76	122.64
#8	2.670	26.70	53.40	106.80	160.20
#9	3.400	34.00	68.00	136.00	204.00
#10	4.303	43.03	86.06	172.12	258.18
#11	5.313	53.13	106.26	212.52	318.78
#14	7.650	76.50	153.00	306.00	459.00
#18	13.600	136.00	272.00	544.00	816.00

Rebar Weight Per Meter Chart

Metric reference for international projects, engineering specifications, and structural calculations.

Bar Size	Soft Metric	Weight/m (kg/m)	Weight per 3m (kg)	Weight per 6m (kg)	Weight per 12m (kg)
#2	#6	0.249	0.75	1.49	2.99
#3	#10	0.561	1.68	3.37	6.73
#4	#13	0.996	2.99	5.98	11.95
#5	#16	1.556	4.67	9.34	18.67
#6	#19	2.240	6.72	13.44	26.88
#7	#22	3.049	9.15	18.29	36.59
#8	#25	3.982	11.95	23.89	47.78
#9	#29	5.071	15.21	30.43	60.85
#10	#32	6.418	19.25	38.51	77.02
#11	#36	7.924	23.77	47.54	95.09
#14	#43	11.410	34.23	68.46	136.92
#18	#57	20.284	60.85	121.70	243.41

Rebar Dimensions Chart

Complete dimensional reference including nominal diameter, circumference, and cross-section area for all US standard rebar sizes.

Bar Size	Diameter (in)	Diameter (mm)	Radius (in)	Circumference (in)	Area (in²)	Area (mm²)
#2	0.250	6.35	0.125	0.786	0.05	32
#3	0.375	9.525	0.188	1.178	0.11	71
#4	0.500	12.70	0.250	1.571	0.20	129
#5	0.625	15.875	0.313	1.963	0.31	200
#6	0.750	19.05	0.375	2.356	0.44	284
#7	0.875	22.225	0.438	2.749	0.60	387
#8	1.000	25.40	0.500	3.142	0.79	509
#9	1.128	28.65	0.564	3.544	1.00	645
#10	1.270	32.26	0.635	3.990	1.27	819
#11	1.410	35.81	0.705	4.430	1.56	1006
#14	1.693	43.00	0.847	5.319	2.25	1452
#18	2.257	57.30	1.129	7.090	4.00	2581

US Rebar Size vs Metric Equivalent Chart

“Soft metric” sizes are direct name conversions of US imperial bars — the physical dimensions are identical. No change in bar size or weight occurs.

ℹ️

Soft Metric vs Hard Metric

Soft metric = same bar, renamed (e.g., #4 → #13). Hard metric = truly metric-sized bars (e.g., 12mm, 16mm) used in Europe and Canada. This chart covers soft metric only.

US Imperial Size	Soft Metric Size	Nominal Diameter (in)	Nominal Diameter (mm)	Weight (lb/ft)	Weight (kg/m)	Physical Change?
#2	#6	0.250″	6.35 mm	0.167	0.249	None
#3	#10	0.375″	9.525 mm	0.376	0.561	None
#4	#13	0.500″	12.70 mm	0.668	0.996	None
#5	#16	0.625″	15.875 mm	1.043	1.556	None
#6	#19	0.750″	19.05 mm	1.502	2.240	None
#7	#22	0.875″	22.225 mm	2.044	3.049	None
#8	#25	1.000″	25.40 mm	2.670	3.982	None
#9	#29	1.128″	28.65 mm	3.400	5.071	None
#10	#32	1.270″	32.26 mm	4.303	6.418	None
#11	#36	1.410″	35.81 mm	5.313	7.924	None
#14	#43	1.693″	43.00 mm	7.650	11.410	None
#18	#57	2.257″	57.30 mm	13.600	20.284	None

Rebar Grade Comparison Chart

Rebar grade refers to minimum yield strength in ksi (thousands of pounds per square inch). Grade does not affect weight — only strength.

Grade	ASTM Standard	Min. Yield Strength	Min. Tensile Strength	Available Sizes	Typical Use	Does Grade Affect Weight?
Grade 40	ASTM A615	40,000 psi	60,000 psi	#3 – #6	Light residential, slabs	No
Grade 60	ASTM A615	60,000 psi	90,000 psi	#3 – #18	Most common — residential & commercial	No
Grade 75	ASTM A615	75,000 psi	100,000 psi	#6 – #18	Heavy structural, bridges	No
Grade 80	ASTM A706	80,000 psi	100,000 psi	#3 – #18	Seismic zones, ductile structures	No

✅

Key Takeaway for Estimators

Always use the same weight chart regardless of rebar grade. Weight is a function of bar size (diameter) only. Grade 40 #5 = Grade 60 #5 = same weight per foot.

Rebar Bundle Weight Chart

Standard rebar bundles at steel yards. Useful for freight calculations, crane load planning, and ordering verification.

Bar Size	Weight/Ft (lb)	Bar Length	Bars per Bundle (typical)	Bundle Weight (lb)	Bundle Weight (kg)
#3	0.376	20 ft	50	376	171
#4	0.668	20 ft	50	668	303
#4	0.668	40 ft	25	668	303
#5	1.043	20 ft	30	626	284
#5	1.043	40 ft	15	626	284
#6	1.502	20 ft	20	601	273
#7	2.044	20 ft	15	613	278
#8	2.670	20 ft	10	534	242
#9	3.400	20 ft	8	544	247
#10	4.303	20 ft	6	516	234
#11	5.313	20 ft	4	425	193

Note: Bundle quantities vary by supplier. Always confirm with your steel yard before ordering.

Linear Feet Per Ton Chart

Critical for material takeoffs — how many linear feet of rebar equal one ton (2,000 lbs) for each bar size.

Bar Size	Weight/Ft (lb)	Linear Feet per Ton	Linear Meters per Tonne	20 ft Bars per Ton	40 ft Bars per Ton
#2	0.167	11,976	3,650	599	299
#3	0.376	5,319	1,621	266	133
#4	0.668	2,994	912	150	75
#5	1.043	1,918	584	96	48
#6	1.502	1,332	406	67	33
#7	2.044	979	298	49	25
#8	2.670	749	228	37	19
#9	3.400	588	179	29	15
#10	4.303	465	142	23	12
#11	5.313	376	115	19	9
#14	7.650	261	80	13	7
#18	13.600	147	45	7	4

Most Common Rebar Sizes in Residential Construction

The majority of residential concrete work in the US uses #3 through #6 rebar. Here’s what each size is used for and why.

#3 Rebar — ⅜” Diameter

0.376 lb/ft | #10 Metric

Residential sidewalks and walkways
Small slabs under 4 inches thick
Garden walls and landscape edging
Masonry reinforcement (CMU walls)
Lightweight patios with minimal load
Tie bars between slabs

#4 Rebar — ½” Diameter

0.668 lb/ft | #13 Metric

Residential driveways (most common)
Standard 4″ concrete slabs
Patio slabs and garage floors
Retaining walls up to 4 ft height
Footings for residential structures
Steps and staircase reinforcement

#5 Rebar — ⅝” Diameter

1.043 lb/ft | #16 Metric

Foundation walls and stem walls
Commercial slab-on-grade
Retaining walls 4–6 ft height
Pool decks and pool shells
Heavy-duty driveways (trucks)
Columns in light commercial buildings

#6 Rebar — ¾” Diameter

1.502 lb/ft | #19 Metric

Heavy retaining walls over 6 ft
Bridge abutments and culverts
Large foundation slabs
Industrial floor slabs
Beams and column ties
High-load commercial footings

Rebar Weight Formulas

Understanding the formulas lets you calculate any rebar weight from scratch — useful when working with non-standard sizes or verifying supplier data.

Formula 1 — Weight in lb/ft (Imperial)

W (lb/ft) = (d² × π × ρ) / 4 × 0.0833

Simplified: W (lb/ft) = d² × 2.67 / 4 = d² × 0.6676

Where d = nominal diameter in inches | ρ (steel density) = 490 lb/ft³ | 0.0833 = convert in² to ft²

Formula 2 — Weight in kg/m (Metric)

W (kg/m) = d²(mm) × 0.00617

Example — #4 rebar: 12.7² × 0.00617 = 161.29 × 0.00617 = 0.995 kg/m ≈ 0.996 kg/m ✓

Where d = nominal diameter in mm | 0.00617 = π/4 × 7850 kg/m³ × 10⁻⁶ | Steel density = 7850 kg/m³

Practical Shortcut — Total Weight for a Takeoff

Total Weight (lb) = (Number of Bars) × (Bar Length, ft) × (lb/ft from chart)

Example: 100 bars × 20 ft × 0.668 lb/ft = 1,336 lbs = 0.668 tons

🔢

Steel Density Reference

Steel density = 490 lb/ft³ (imperial) = 7,850 kg/m³ (metric). This is the constant used in all rebar weight calculations per ASTM A615.

Visual Weight Comparison — #2 to #11

Weight per foot (lb/ft) comparison across all residential and light commercial rebar sizes. Notice how weight scales with the square of diameter.

0.167

0.376

0.668

1.043

1.502

2.044

2.670

3.400

#10

4.303

#11

5.313

Chart: Weight per Foot (lb/ft) — US Standard Rebar Sizes | Source: ASTM A615 | ConcreteCalculate.com

Worked Contractor Examples

Step-by-step calculations for the most common field scenarios using this rebar weight chart.

Driveway Rebar Takeoff

Given: Residential driveway — 12 ft wide × 40 ft long × 4 inches thick | #4 rebar @ 18″ spacing, both directions

Bars along length: Width ÷ spacing + 1 = 12 ft ÷ 1.5 ft + 1 = 9 bars × 40 ft each

Bars along width: Length ÷ spacing + 1 = 40 ft ÷ 1.5 ft + 1 = 28 bars × 12 ft each

Total linear feet: (9 × 40) + (28 × 12) = 360 + 336 = 696 linear feet

Total weight: 696 ft × 0.668 lb/ft = 464.9 lbs

Add 10% waste: 464.9 × 1.10 = 511.4 lbs

✅ Order: ~512 lbs of #4 rebar (approximately 39 × 20 ft bars)

Foundation Wall Rebar Estimate

Given: Basement foundation wall — 60 ft total perimeter × 8 ft tall × 8 in thick | #5 rebar horizontal @ 12″ spacing, #5 vertical @ 16″ spacing

Horizontal bars: Wall height ÷ spacing + 1 = 8 ft ÷ 1 ft + 1 = 9 rows × 60 ft each = 540 ft

Vertical bars: Perimeter ÷ spacing + 1 = 60 ft ÷ 1.33 ft + 1 = 46 bars × 8 ft each = 368 ft

Total linear feet: 540 + 368 = 908 linear feet

Total weight: 908 ft × 1.043 lb/ft = 947.0 lbs

Add 10% waste/overlap: 947 × 1.10 = 1,042 lbs = 0.52 tons

✅ Order: ~1,042 lbs of #5 rebar (approximately 50 × 20 ft bars or 26 × 40 ft bars)

Column Reinforcement Estimate

Given: 10 concrete columns — each 12″ × 12″ × 10 ft tall | 6 vertical #6 bars per column + #3 ties @ 12″ spacing

Vertical #6 bars: 10 columns × 6 bars × 10 ft = 600 linear ft × 1.502 lb/ft = 901.2 lbs

#3 ties per column: 10 ft ÷ 1 ft spacing + 1 = 11 ties per column

Tie perimeter: Each tie = 4 × (12″ − 3″ cover × 2 + bar dia) ≈ approx 3.0 ft per tie

Total tie length: 10 columns × 11 ties × 3.0 ft = 330 ft × 0.376 lb/ft = 124.1 lbs

Total + 10% waste: (901.2 + 124.1) × 1.10 = 1,127.6 lbs

✅ Order: ~901 lbs of #6 rebar + ~137 lbs of #3 rebar (total ≈ 1,128 lbs)

Freight Weight Calculation

Given: Delivery truck carrying 200 × 20 ft #5 bars + 150 × 20 ft #4 bars. What is total freight weight?

#5 rebar weight: 200 bars × 20 ft × 1.043 lb/ft = 4,172 lbs

#4 rebar weight: 150 bars × 20 ft × 0.668 lb/ft = 2,004 lbs

Total steel weight: 4,172 + 2,004 = 6,176 lbs = 3.09 tons

Add truck tare weight check: Ensure total load does not exceed truck’s rated payload capacity.

✅ Total Rebar Freight Weight: 6,176 lbs (3.09 tons) — safely within single flatbed truck capacity

Frequently Asked Questions

15 most common questions from contractors, students, and estimators about rebar weight and sizing.

How much does #4 rebar weigh per foot?

#4 rebar weighs 0.668 lb per foot (0.996 kg/m). A standard 20 ft bar weighs 13.36 lbs. A 40 ft bar weighs 26.72 lbs. It is the most widely used size in residential construction.

How much does #5 rebar weigh per foot?

#5 rebar weighs 1.043 lb per foot (1.556 kg/m). A standard 20 ft bar weighs 20.86 lbs. A 40 ft bar weighs 41.72 lbs. Commonly used in foundation walls, commercial slabs, and pool decks.

What does the rebar number mean?

The rebar bar number represents its nominal diameter in eighths of an inch. So #4 = 4 × ⅛” = ½” diameter. #8 = 8 × ⅛” = 1″ diameter. This is an easy field rule for quickly identifying bar size.

Does rebar grade affect weight?

No. Rebar grade (Grade 40, 60, 75, 80) refers to minimum yield strength, not dimensions. Weight is determined by bar size (diameter) only. Grade 40 #5 rebar and Grade 60 #5 rebar weigh exactly the same per foot.

How much does a 20 ft #4 rebar bar weigh?

A 20 ft #4 rebar bar weighs 13.36 lbs (0.668 lb/ft × 20 ft = 13.36 lbs).

How much does a 40 ft #5 rebar bar weigh?

A 40 ft #5 rebar bar weighs 41.72 lbs (1.043 lb/ft × 40 ft = 41.72 lbs).

How many linear feet are in a ton of #4 rebar?

There are approximately 2,994 linear feet in one ton (2,000 lbs) of #4 rebar. Formula: 2,000 ÷ 0.668 lb/ft = 2,994 ft. This equals about 150 standard 20 ft bars.

What ASTM standard covers rebar weight?

ASTM A615 is the primary standard for deformed and plain carbon-steel bars for concrete reinforcement in the United States. It specifies bar sizes, nominal dimensions, weight tolerances, yield and tensile strength requirements. ASTM A706 covers low-alloy steel rebar for seismic applications.

How do you calculate rebar weight manually?

Use the metric shortcut formula: W (kg/m) = d²(mm) × 0.00617. For imperial: W (lb/ft) = d²(in) × 0.6676. Multiply by the bar length to get total weight. Always add 5–10% for lap splices and waste.

What is the most common rebar size for residential driveways?

#4 rebar (½” diameter, 0.668 lb/ft) is the standard for most residential driveways. It is typically placed in a grid pattern at 12″–18″ spacing for a 4-inch thick slab. Light-duty driveways sometimes use #3 rebar.

What does #3 rebar weigh per foot?

#3 rebar weighs 0.376 lb per foot (0.561 kg/m). A 20 ft bar weighs 7.52 lbs and a 40 ft bar weighs 15.04 lbs. It is the lightest commonly used structural rebar size.

What does #8 rebar weigh per foot?

#8 rebar weighs 2.670 lb per foot (3.982 kg/m). A 20 ft bar weighs 53.40 lbs. #8 bars are 1 inch in diameter and commonly used in heavy commercial beams, columns, and bridge structures.

What is #18 rebar used for?

#18 rebar (2.257″ diameter, 13.60 lb/ft) is a heavy structural bar used in bridge piers, massive columns, high-rise building cores, and industrial foundations. A single 20 ft #18 bar weighs 272 lbs. It is rarely used in residential work.

What is the difference between #14 and #18 rebar?

#14 rebar is 1.693″ diameter and weighs 7.65 lb/ft, while #18 rebar is 2.257″ diameter and weighs 13.60 lb/ft. Both are heavy structural bars limited to commercial, industrial, and infrastructure projects. Neither is used in typical residential construction.

Why is #12 and #13 rebar not in the US standard chart?

US imperial rebar skips from #11 to #14 because #12 and #13 are not ASTM A615 standard bar sizes. The numbering follows bar size designations that correspond to cross-sectional area increments, not strictly sequential bar counts. After #11, the next standard size is #14 (soft metric #43).

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Rebar Weight ChartUS Standard Sizes #2 – #18