Aggregate (Bajri / Crush) Calculator for Slabs & Foundations
Crush (bajri) quality decides your slab's strength as much as cement does. Margalla crush is the Punjab gold standard for slabs; Sargodha crush is a budget-friendly alternative for filling and less critical works. This calculator gives you the quantity either way.
Quick Answer
M20 (1:1.5:3) concrete uses about 84 cft of crush per 100 cft of slab — roughly 2.6 tons. Enter your slab or foundation volume below to get bajri quantity in cft and tons with estimated cost at current Margalla / Sargodha rates.
Aggregate Calculator
How to Use the Aggregate Calculator
- 1Enter your slab, footing or column volume (length × width × thickness).
- 2Select your mix ratio — M20 (1:1.5:3) for slabs, M15 (1:2:4) for filling works.
- 3Read crush quantity in cft and tons, plus sand and cement for the same pour.
- 4Order by weighed ton; a typical dump truck carries 300–500 cft of crush.
Frequently Asked Questions
How much bajri is required per cft of concrete?
For M20 (1:1.5:3) concrete you need about 0.84 cft of crush per cft of wet concrete — around 84 cft per 100 cft of slab. In tons, that is roughly 2.2–2.6 tons per 100 cft depending on stone moisture.
Margalla vs Sargodha crush — which should I use?
Margalla crush (blue-grey, hard, flaky edges interlock well) is best for slabs and beams. Sargodha crush is cheaper and fine for filling, plinth protection and PCC. Never use uncrushed river gravel for an RCC slab.
How many tons of crush for a 5 marla slab?
A 5 marla (about 1,350 sq ft) 4″ slab in M20 needs roughly 1,100–1,200 cft of crush — about 30–34 tons. Calculate your exact dimensions above for a tighter number.
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