Slab Rebar and quantity Calculations

Slab Calculator

1) Units

Metric (m, m², m³)

2) Canvas & File Upload

Canvas Width(px): Canvas Height(px):

Upload PDF or Image:

3) Draw Polygons (Edges & Openings)

Edges (blue) Openings (red)
SHIFT => snap lines horizontally/vertically from last point

4) Scale Setup

Direct: "1 px= ??? (m or ft)"

Scale:

Known side => pick 2 points => real length in chosen units

5) Slab & Rebar (with Top Extra Bars)

Slab Thickness:

Concrete Grade: M10 M15 M20 M25 M30

Dev Length:
Crank Length:
Bend Reduction:

Main Bars (Longer Span):

Spacing(mm):
Diameter(mm): 6 8 10 12 16 20 25

Distribution Bars (Shorter Span):

Spacing(mm):
Diameter(mm): 6 8 10 12 16 20 25

Enable Top Extra Bars

Top Extra Dia (mm): 8 10 12 16 20 25
Coverage Fraction (0–1):
e.g., 0.25 means top extra bars cover 25% of the slab length from each support

6) Bar Tools

A) #Bars from total weight

Dia(mm): 6 8 10 12 16 20 25 Total Weight(kg): Bar Length(m):

B) Weight from #bars & bar length

Dia(mm): 6 8 10 12 16 20 25 #Bars: BarLen(m):

Results:

Details:

Final Report