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Tool: Rebar Calculator — 免費線上計算機 | HomeCalcPro | 列印時間:
混凝土與泥作工程Concrete & Rebar隱私至上
Rebar Calculator — 免費線上計算機 | HomeCalcPro
Rebar Calculator精準試算，提供行業標準公式與即時測算結果。
Project & Material Dimensions
Estimated Material & Energy Output
Primary Metric--
Rebar Grid Layout Formula
Transparent mathematical methodology explained in plain English.
Runs = (Dimension / Spacing) + 1 | Total Linear Ft = [ (Length Runs × L) + (Width Runs × W) ] × (1 + Overlap Waste [10%])Calculates cross-grid reinforcing steel bar layout with standard 12", 18", or 24" on-center spacing, edge clearances, and 10% lap splice overlap.
Variables Explained:
- Slab Length (ft): Length of concrete slab or driveway.
- Slab Width (ft): Width of concrete slab.
- Grid Spacing (Inches): Center-to-center spacing (12", 18", or 24" on center).
Real Project Example
24 ft × 24 ft Garage Slab with 18" On-Center Rebar Grid
Calculating total linear feet and 20-foot sticks of #4 rebar.
Sample Project Inputs:
Length:24 ft
Width:24 ft
Spacing:18 inches (1.5 ft)
Waste:10%
Step-by-Step Calculation:
- Runs in Each Direction: (24 / 1.5) + 1 = 17 runs.
- Linear Feet per Direction: 17 runs × 24 ft = 408 ft.
- Total Grid Footage (Both Ways): 408 + 408 = 816 ft.
- Total with 10% Lap Overlap: 816 × 1.10 = 898 Linear Feet.
- 20-Foot Sticks to Order: 898 / 20 = 45 Sticks.
- Grid Weight (#4 Rebar at 0.668 lbs/ft): 898 × 0.668 = 600 lbs.
Calculated Answer:45 Sticks of 20-foot #4 Rebar (898 linear ft / 600 lbs).
Knowledge Base
常見問題解答 (FAQ): Rebar Calculator
Click any question below to expand quick answers, formulas, and expert tips.
What size rebar is standard for residential concrete slabs?
#4 rebar (1/2-inch diameter) spaced 18 inches on center is the standard for 4-inch residential driveways, garage slabs, and patios.
How much should rebar overlap at splice joints?
Building codes require rebar splices to overlap by at least 30 times the bar diameter (e.g. 15 inches of overlap for #4 1/2-inch rebar).