Concrete and steel calculator (lantar aur chhat)
Cement, sand and crush for a slab, beam, column or footing, and the steel counted from the bars on your drawing.
Concrete and steel (lantar, chhat, beam, column)
Cement, sand and crush for a slab, beam, column or footing, from that element’s own dimensions. Steel is counted from the bars on your approved structural drawing — sizes, spacings and counts you enter, in metric or inch bars — never designed here.
Common questions
How much cement goes into a 100 sq ft, 5 inch slab?
That is 41.7 cu ft of concrete. At 1 : 2 : 4 it needs about 41.7 × 1.54 = 64.2 cu ft of dry material, of which one seventh is cement: 9.2 cu ft, or 7.3 bags of 50 kg, with about 18 cu ft of sand and 37 cu ft of crush.
Where do the bar sizes and spacing come from?
From the structural drawing that was approved with your plan, prepared by an engineer for your spans and loads. This calculator counts the steel in that drawing so you buy the right amount; it does not decide sizes, spacings or covers. If the mistri wants to change the drawing, ask the engineer, not the mistri.
Metric or inch bars?
Both are sold. Inch bars are named in sutar (eighths of an inch): 3 sutar = 3/8 in = #3 (9.5 mm), 4 sutar = 1/2 in (12.7 mm). Metric bars are 8, 10, 12, 16, 20 or 25 mm. They are different bars — a 12 mm bar is not a 1/2 in bar — so pick exactly what the drawing says. Weight is d² ÷ 162 kg per metre (d in mm).
How long before the shuttering comes off?
Follow your engineer; a common rule is slab props 21 days and long beams 28 days. Cure by ponding water on the slab from the next morning for at least 14 days.
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Want a builder to check the numbers?
Blackfire Real Estate & Builders builds on labour or contract rate in Islamabad and Rawalpindi and does one-off site checks for people building themselves.
0371-7581455All quantities on this site are estimates for planning and buying. Site conditions, workmanship and brands change the real figures. Structural sizes and reinforcement must come from your approved drawings and engineer.