Construction & Engineering Calculators

Concrete vs Mortar: What's the Difference and When to Use Each

Concrete contains cement, sand, AND coarse aggregate, and is used for structural work (foundations, slabs, columns) that needs to bear load. Mortar contains only cement and sand (no coarse aggregate), and is used for binding masonry units together and for plastering — the two aren't interchangeable, and mixing them up wastes both material and structural strength.

How a Floor's Total Load Sets the UDL a Supporting Beam Must Carry

A floor's total design load, computed per square metre, converts directly into the uniformly distributed load a supporting beam must be checked against — by multiplying it by the strip width of floor the beam actually carries.

How a Room's Floor Area and Perimeter Are Calculated

A rectangular room's floor area is length times width, and its perimeter — the total distance around all four sides — is twice the sum of length and width, a figure that turns out to be the starting point for estimating wall area too.

How a Room's Perimeter Becomes Its Total Wall Area

Feeding a room's real perimeter into the wall area calculator as the wall length gives the combined area of all four walls at once, rather than one wall at a time — a real shortcut for estimating paint or plaster for an entire room.

How a Site's Cut and Fill Soil Balance Is Calculated

Subtracting a site's fill requirement from its cut (excavated) volume shows in one number whether there's surplus soil to haul away or a shortfall that needs importing — the core planning question behind any earthmoving project.

How a Stair Stringer's Length and Angle Are Calculated

A stair stringer's diagonal length is the hypotenuse of the total rise and run — a direct application of the Pythagorean theorem — and its angle comes from the arctangent of that same rise-to-run ratio.