Question 1

How much cement is required for a 1000 sqft slab?

Accepted Answer

It depends on slab thickness and concrete grade. For a typical 5-inch (0.42ft) thick M20 slab over 1000 sqft, that's roughly 420 cubic feet of wet concrete — use the calculator above with your exact dimensions and grade for a precise cement bag count.

Question 2

What is the dry volume factor in concrete calculation?

Accepted Answer

Wet (mixed, compacted) concrete volume is smaller than the loose dry volume of its cement, sand, and aggregate ingredients before mixing — voids between dry particles get filled once water is added. The standard factor used is 1.54, meaning dry ingredient volume = wet volume × 1.54.

Question 3

What is the mix ratio for M20 concrete?

Accepted Answer

The nominal mix ratio for M20 grade concrete is 1:1.5:3 (cement:sand:aggregate).

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