How Many Bricks in a Wall? The Formula, with Mortar and Wastage
Why a cubic metre holds 500 modular bricks, how to get mortar right, and a worked example with openings deducted properly.
App guides
Construction Calculator A1
The method behind every calculator in the app — concrete, brickwork, plaster and material quantities, shown step by step.
Cement, Sand & Aggregate for M20: Quantities per Cubic Metre
Where the 1.54 dry volume factor comes from, quantities in bags, kg and cubic feet, and how to scale to any grade.
How to Calculate Concrete for Any Shape — The Complete Guide (2026)
Volume formulas for slabs, columns, footings, beams and stairs, then mix ratios, material and cost estimation, curing milestones and the tests to run.
Why Construction Calculator A1 Is the #1 Choice for Civil Engineers and Contractors in 2026
What Construction Calculator A1 does, who it is for, its quantity, steel and BBS, area and unit-converter calculators, and how Free and Pro differ.
Best Construction Calculator App
An overview of Construction Calculator A1: its six sections, the quantity calculators it includes, and its support for metric and imperial units.
How to Accurately Calculate Concrete Volume for Construction Projects
The concrete volume formula with worked examples for a slab, column and beam, the estimating mistakes to avoid, and how Construction Calculator A1 helps.
Top 7 Construction Calculator Apps of 2024
Seven construction calculator apps, led by Construction Calculator A1, covering concrete, brickwork, rebar, house cost, metal weight and unit conversion.
The Top 10 Construction Calculator Apps in 2026
A round-up of 10 construction calculator apps, led by Construction Calculator A1 and Construction Expert A1 Pro, with what each one calculates.
Calculate Quantities of Materials for Concrete: Cement, Sand, Aggregates
How to work out cement, sand, aggregate, admixture and water for concrete from the mix ratio and dry volume factor, with a worked M20 example for 124 m³.
How to Calculate Rectangular Water Tank Capacity
Multiply a rectangular tank's internal length, breadth and water depth in metres to get cubic metres, then convert to litres, with a worked example.
How to Calculate Required Floor Tiles
How to work out the number of floor tiles for a room: floor area plus skirting area, divided by the area of one tile, plus 5% for cuts and wastage.
How to Calculate Steel Rod Weight
How to work out the weight of a steel rod: square the diameter in millimetres, multiply by the length in metres and divide by 162 to get kilograms.
Construction Calculator A1
These guides explain the calculations behind the app. See what it does and how it works offline.