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Rebar Weight Calculator
Calculate steel reinforcement weight per bar size with multi-row project input, BBS summary, and weight reference table.
Reinforced Concrete / QS QS professionals, contractors, engineers Commercial Intent: VERY HIGH
Engineering Formulas
Rebar Weight Calculation
W = (ฯ ร dยฒ / 4) ร L ร ฯ
where ฯ = 7,850 kg/mยณ
W: Weight (kg)
d: Bar diameter (m)
L: Total length (m)
ฯ: Density of steel (7,850 kg/mยณ)
Worked Example
Beam Reinforcement
bars1: 4-ร16 ร 6mbars2: 2-ร12 ร 6m
Main Bars
4 ร ร16 ร 6m = 4 ร 1.579 ร 6 = 37.90 kg
Top Bars
2 ร ร12 ร 6m = 2 ร 0.888 ร 6 = 10.66 kg
Total
37.90 + 10.66 = 48.56 kg
Result: Total steel weight: 48.6 kg per beam
Engineering Notes
Add 5-10% for laps, overlaps, and wastage.
For large projects, order by bar schedule (BBS) to minimize cutting waste.
Weight tables assume standard density โ verify for special grades.
Assumptions
โข Steel density: 7,850 kg/mยณ
โข Standard bar sizes per IS/ASTM/BS
โข No coupler or lap weight included
โข Cutting/waste allowance not included
Common Mistakes
โ Forgetting to multiply by quantity of bars
โ Using nominal diameter instead of actual
โ Not including lap lengths in total length
Frequently Asked Questions
What is the formula for rebar weight?
Weight = (ฯ ร dยฒ / 4) ร L ร 7850 kg/mยณ where d is diameter in meters and L is length.
What are standard rebar sizes?
Common sizes: 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 32mm, 40mm. Each has a standard weight per meter.
How do I use the BBS feature?
Add multiple rows for different bar sizes and lengths. The calculator aggregates all rows into a total weight and bar bending schedule.
References & Standards
IS 1786ASTM A615BS 4449
IS 1786
High Strength Deformed Steel Bars for Concrete Reinforcement
ASTM A615
Standard Specification for Deformed Carbon-Steel Bars
BS 4449
Steel for Reinforcement of Concrete