Estimate concrete materials, brickwork quantities, and plaster materials with Indian brick sizes, visible mix ratios, and editable waste.
Why is M15 shown as a choice and not a fixed rule?
Because nominal mix is a convention from IS 456, not a law of nature. M15 is commonly written as 1:2:4 and M20 as 1:1.5:3, but site practice can differ and design mixes need not follow those ratios at all. So the page starts from the named nominal mix and lets you override it.
Why do you use 190 x 90 x 90 mm bricks?
Because IS 1077 gives that as the standard modular brick size in India. With mortar, the nominal module becomes 200 x 100 x 100 mm, which is what drives the brick count per cubic metre. Many competitor pages quietly use an imperial brick and overstate or understate the count for Indian work.
What is the dry-volume factor doing here?
Loose dry ingredients occupy more volume than the final compacted concrete or mortar. The page therefore keeps a dry-volume allowance as an editable assumption. It is not a statutory number, so it should stay visible and changeable.
Should I add waste?
Usually yes. Breakage, spillage, uneven substrate, and site trimming all create losses. The page keeps waste as a direct percentage so you can see what it adds instead of burying it in a hidden constant.
Does this replace a structural design mix?
No. This is a quantity estimator, not a structural approval. Use it to plan bags, sand, aggregate, bricks, and mortar. Let the engineer and the site specifications decide the final grade and mix design.