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Tool: Rebar Calculator — 무료 온라인 계산기 | HomeCalcPro | 인쇄 일시:
콘크리트 & 조적 공사Concrete & Rebar개인정보 보호 최우선
Rebar Calculator — 무료 온라인 계산기 | HomeCalcPro
Rebar Calculator에 대한 정확하고 신속한 실시간 계산 및 공식 제공.
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
자주 묻는 질문 (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).