Rebar Weight Calculator
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A comprehensive tool for construction professionals to accurately calculate rebar weight and material requirements for concrete projects.
Single Rebar Weight Calculator
Calculate the weight of a single rebar by specifying its size, length, and quantity.
Results
| Bar Size: | #4 (1/2") |
|---|---|
| Diameter: | 0.500 inches |
| Weight per foot: | 0.668 lbs/ft |
| Length (per bar): | 20.00 feet |
| Quantity: | 1 piece |
| Total Length: | 20.00 feet |
| Total Weight: | 13.36 lbs |
Multiple Rebar Weight Calculator
Calculate the total weight of different rebar sizes and quantities for your project.
Summary Results
| Total Bars: | 10 pieces |
|---|---|
| Total Length: | 200.00 feet |
| Total Weight: | 133.60 lbs |
Slab Grid Rebar Calculator
Calculate rebar requirements for concrete slabs with grid patterns.
For double-mat reinforcement (top and bottom), use 2
Slab Reinforcement Results
| Bar Size: | #4 (1/2") |
|---|---|
| Slab Area: | 300.00 sq ft |
| Length Direction Bars: | -- |
| Width Direction Bars: | -- |
| Total Bars Needed: | -- |
| Total Linear Footage: | -- |
| Total Weight: | -- |
Grid Visualization
This diagram represents the approximate rebar grid layout for your slab:
Calculation results will appear here
Rebar Cost Estimator
Calculate the total cost of rebar materials for your project.
$
per lb
$
%
Cost Estimate Results
| Total Weight: | 1,000.00 lbs |
|---|---|
| Material Cost: | $750.00 |
| Additional Costs: | $100.00 |
| Subtotal (Before Tax): | $850.00 |
| Tax (7%): | $59.50 |
| Total Estimated Cost: | $909.50 |
Rebar Reference Tables
Standard rebar specifications and weight charts for project planning.
US Standard Rebar Sizes
| Bar Size | Diameter (in) | Diameter (mm) | Weight per Foot (lbs) | Weight per Meter (kg) | Cross-Sectional Area (sq in) |
|---|---|---|---|---|---|
| #3 | 0.375 | 9.525 | 0.376 | 0.560 | 0.11 |
| #4 | 0.500 | 12.700 | 0.668 | 0.994 | 0.20 |
| #5 | 0.625 | 15.875 | 1.043 | 1.552 | 0.31 |
| #6 | 0.750 | 19.050 | 1.502 | 2.235 | 0.44 |
| #7 | 0.875 | 22.225 | 2.044 | 3.042 | 0.60 |
| #8 | 1.000 | 25.400 | 2.670 | 3.973 | 0.79 |
| #9 | 1.128 | 28.651 | 3.400 | 5.060 | 1.00 |
| #10 | 1.270 | 32.258 | 4.303 | 6.404 | 1.27 |
| #11 | 1.410 | 35.814 | 5.313 | 7.907 | 1.56 |
| #14 | 1.693 | 43.002 | 7.650 | 11.384 | 2.25 |
| #18 | 2.257 | 57.328 | 13.600 | 20.238 | 4.00 |
Metric Rebar Sizes
| Bar Size (mm) | Diameter (mm) | Weight per Meter (kg) | Equivalent US Size | Cross-Sectional Area (mm²) |
|---|---|---|---|---|
| 6 | 6 | 0.222 | - | 28.3 |
| 8 | 8 | 0.395 | - | 50.3 |
| 10 | 10 | 0.617 | #3 | 78.5 |
| 12 | 12 | 0.888 | #4 | 113 |
| 16 | 16 | 1.578 | #5 | 201 |
| 20 | 20 | 2.466 | #6 | 314 |
| 25 | 25 | 3.853 | #8 | 491 |
| 28 | 28 | 4.834 | #9 | 616 |
| 32 | 32 | 6.313 | #10 | 804 |
| 36 | 36 | 7.990 | #11 | 1018 |
Rebar Applications Guide
| Application | Recommended Bar Size | Typical Spacing | Notes |
|---|---|---|---|
| Concrete Driveways/Patios | #3 or #4 | 12"-18" on center | For residential use, 4" thick slab |
| Concrete Slabs (residential) | #3 or #4 | 16" on center | For 4" thick slab |
| Concrete Slabs (commercial) | #4 or #5 | 12" on center | For 5"+ thick slab |
| Footings (residential) | #4 or #5 | 12"-18" on center | Horizontal reinforcement |
| Footings (commercial) | #5 or #6 | 8"-12" on center | Horizontal reinforcement |
| Foundation Walls (residential) | #4 or #5 | 16"-24" on center | Vertical and horizontal reinforcement |
| Foundation Walls (commercial) | #5 or #6 | 12"-18" on center | Vertical and horizontal reinforcement |
| Columns (residential) | #4 or #5 | -- | Typically 4 vertical bars with ties |
| Columns (commercial) | #6 to #11 | -- | Size based on structural requirements |
| Beams (residential) | #4 to #6 | -- | Size based on span and load |
How To Use This Calculator
Single Bar Calculator
- Select your preferred rebar standard (US, Metric, or Canadian)
- Choose the rebar size from the dropdown list
- Enter the length of each rebar piece
- Specify the quantity of identical pieces you need
- Click "Calculate" to view the total weight and other specifications
- Use the "Copy Results" button to copy the information to your clipboard
Multiple Bars Calculator
- Enter information for different rebar sizes and quantities
- Use the "Add Bar" button to include additional rebar types
- Click "Calculate All" to compute the total weight for all bars
- Review the summary results showing total bars, length, and weight
Slab Grid Calculator
- Select the rebar size for your concrete slab
- Enter the slab dimensions (length and width)
- Specify the grid spacing for both directions
- Enter the edge inset (distance from edge to first bar)
- Indicate how many layers/mats of reinforcement you need
- Click "Calculate Grid Requirements" to determine number of bars needed
- View the grid visualization for a representation of your layout
Cost Estimator
- Import weight data from other calculators or enter manually
- Specify the price per unit weight of rebar
- Add any additional costs like shipping or handling
- Enter your local tax rate if applicable
- Click "Calculate Cost Estimate" to determine total project cost
About Rebar Weight Calculations
Understanding Rebar Weight Formula
Rebar weight calculations are based on the diameter, length, and density of steel. The formula used is:
Weight = (Ï€ × D² / 4) × Length × Density
Where D is the diameter, and standard steel density is 7850 kg/m³ (490 lb/ft³)
This calculator uses the standard weights for reinforcing bars as defined by ASTM (American Society for Testing and Materials) for US sizes, CSA (Canadian Standards Association) for Canadian sizes, and Eurocode for European sizes.
Why Accurate Weight Calculation Matters
- Material Cost Estimation - Precise weight calculations ensure accurate budgeting for material costs.
- Transportation Planning - Steel rebar is heavy, and vehicle weight limits must be considered when planning transportation.
- Structural Requirements - Ensuring the correct amount of reinforcement is used to meet engineering specifications.
- Project Management - Helps in planning labor requirements and scheduling for installation.
Important Considerations
- Always consult structural engineering specifications for your specific project.
- This calculator provides estimates and should be used for planning purposes.
- Consider adding 5-10% extra material for waste, overlaps, and unexpected requirements.
- Local building codes may have specific requirements for rebar type, size, and spacing.