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Category Foundation & Concrete

Standard

Price per Unit (optional)

Description	Size	Length	Qty	Subtotal	Action

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About

Reinforcing bar (rebar) logistics are a heavy component of construction planning, quite literally. Transport restrictions often cap truck loads by weight, not volume, making accurate tonnage estimation critical for shipping scheduling. Furthermore, steel prices fluctuate per ton, requiring precise weight data for budget forecasting.

This tool aggregates the linear mass density of standard ASTM (Imperial) and ISO (Metric) bars. It allows project managers to itemize reinforcement schedules - separating column bars from slab grids - to produce a cumulative bill of materials. The system accounts for standard rolling tolerances and density constants used in civil engineering.

Formulas

The total weight W is the product of total length and linear mass density:

W = (L × N) × w_unit

Where:

L is the length of a single bar.
N is the count (quantity) of bars.
w_unit is the weight per unit length (lb/ft or kg/m).

Reference Data

Bar Size (US)	Weight (lb/ft)	Bar Size (Metric)	Weight (kg/m)
#3	0.376	6 mm	0.222
#4	0.668	8 mm	0.395
#5	1.043	10 mm	0.617
#6	1.502	12 mm	0.888
#7	2.044	16 mm	1.580
#8	2.670	20 mm	2.470
#9	3.400	25 mm	3.850
#10	4.303	32 mm	6.310

Frequently Asked Questions

No. The calculator estimates the steel rebar weight only. Tie wires, chairs, and spacers are auxiliary components and typically add negligible weight relative to the rebar itself, though they have their own line item in costs.

They are different standards. A #4 bar is 0.500 inches (12.7mm), whereas the closest metric standard is 12mm. They are often interchangeable in casual contexts, but for structural engineering, the specific cross-sectional area defined by the code (ACI vs Eurocode) must be respected.

Lap splices (where bars overlap to maintain continuity) significantly increase total length. You should account for this in the "Length" or "Quantity" input. A common rule of thumb is to add 10-15% to the total length for overlaps and waste.

Steel is a commodity typically sold by weight (e.g., price per ton or per kg). This tool calculates the total weight first, then applies your "Price per Unit Weight" input to generate the total cost.