Steel Weight Calculator
Calculate steel weight from length and diameter — the structural steel estimator's fastest tool.
Free · No signup · By the analysts at Blackridge Research · Updated 2026-07-18
Inputs
Results
What this means
Adjust the inputs to calculate.
About the Steel Weight Calculator
Steel weight estimation is essential for structural steel procurement and costing.
This calculator provides quick weight estimates from rebar diameter and length.
Formula
Weight per Foot = Diameter² / 9 | Total Weight = Length × Weight per Foot
- D
- — Diameter (inches)
- L
- — Length (ft)
- W
- — Weight (lbs)
How to use this calculator
- 1
Enter diameter
The diameter of the steel rebar in inches.
- 2
Enter length
The total length of steel in feet.
Example calculations
Rebar weight calculation
A contractor needs #5 rebar (5/8 inch diameter) with 1,000 ft length.
Weight per Foot = 0.625²/9 = 0.0434 lbs/ft. Total = 1,000 × 0.0434 = 43.4 lbs.
- Total steel weight:
- 43.4 lbs
- Weight per foot:
- 0.043 lbs
- In tons:
- 0.02 tons
1,000 ft of #5 rebar weighs 43.4 lbs.
Interpreting your results
Steel weight impacts shipping costs, crane requirements, and structural design.
Different steel shapes have different weight calculations.
Need the market data behind this calculator?
The Steel Weight Calculator is only as good as its inputs. Blackridge Research publishes syndicated market reports with vetted market sizes, growth rates, and competitive landscapes across 40+ industries — and builds custom studies when the shelf report doesn't exist.
Industry applications
Business
- Material procurement: estimate steel quantities for orders.
- Cost estimation: calculate steel material costs.
- Transportation planning: estimate shipping weights.
Construction
- Structural steel: estimate weights for structural elements.
- Rebar: calculate rebar quantities for concrete structures.
- Steel framing: estimate weights for steel framing.
Research
- Structural analysis: calculate steel weights for designs.
- Cost studies: analyze steel costs.
Common mistakes to avoid
-
✗ Using the wrong formula for different steel types
Different shapes have different weight formulas.
-
✗ Forgetting to convert units
Ensure consistent units for diameter and length.
Frequently asked questions
›What is the weight of #4 rebar per foot?
#4 rebar (1/2 inch) weighs 0.668 lbs/ft.
›What is the weight of steel per cubic foot?
Steel weighs approximately 490 lbs per cubic foot.
Glossary
- Rebar:
- Reinforcing steel bars used in concrete construction.
- Structural steel:
- Steel used for structural framing and supports.
- Diameter:
- The width of a round steel bar.
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