Constructions Calculators

Construction Calculator is a professional toolkit built for civil engineers, site supervisors, lab technicians, surveyors, and engineering students — everything you need on site, in the lab, or at the desk, in one app. Every calculator lets you pick the unit for each field independently (metric or imperial), so you're never stuck converting numbers by hand. QUANTITY & SITE • Concrete Volume & Materials — cement, sand, aggregate and water from slab/footing/column/beam volume • Rebar Weight — steel weight from diameter, length and quantity, multi-bar schedules • Block / Brick Masonry — unit count and mortar quantity from wall size • Plastering — cement and sand from area, thickness and number of coats • Excavation / Earthwork — trench and pit volume with bulking allowance • Formwork Area — shuttering contact area for columns, beams and slabs • Water-Cement Ratio & Slump — quick ratio arithmetic plus a slump reference table CONCRETE MIX DESIGN • ACI 211.1 Trial Mix Design — absolute-volume method batch quantities per m³ • Cube Test QC Statistics — mean, standard deviation and characteristic strength from a test series LABORATORY TESTS • Field Density — sand cone, core cutter and rubber balloon methods • Proctor Compaction — maximum dry density and optimum moisture content • Atterberg Limits — liquid limit, plastic limit, plasticity and liquidity index • California Bearing Ratio (CBR) — at 2.5mm and 5.0mm penetration • Specific Gravity & Absorption — soil (pycnometer), coarse and fine aggregate • Sieve Analysis / Gradation — fineness modulus, D10/D30/D60, Cu, Cc • Aggregate Quality Tests — impact value, crushing value, LA abrasion, flakiness, elongation, clay lumps • Aggregate Bulk Density & Voids • Cube / Cylinder Compressive Strength • Modulus of Elasticity — concrete (ACI) and steel • Rebar Tensile / Yield Strength • Marshall Mix Test — stability, flow, air voids, VMA, VFA • Asphalt Field Compaction — percent compaction and in-place air voids SURVEYING • Area by Coordinates — shoelace method from traverse points • Traverse Closure — latitude/departure, linear misclosure, precision • Earthwork Volume — cross-section (trapezoidal & Simpson's rule) and grid methods • Leveling Reduction — Height of Instrument and Rise & Fall methods, with arithmetic check • Curve Setting-Out — horizontal circular curves and vertical curves • Bearing / Azimuth — conversions, back azimuth, included angle QUICK DESIGN CHECKS (ACI 318) • Beam Flexural Check — singly-reinforced rectangular section, φMn vs Mu • Column Axial Capacity — tied short column • One-Way Slab Check — minimum thickness and flexural check • Isolated Footing Check — sizing, one-way and punching shear • Retaining Wall Stability — overturning and sliding factors of safety • Development / Lap Splice Length UNIT CONVERTER Convert length, area, volume, mass, density, force, pressure/stress, angle, temperature and flow rate — every engineering unit you'll need on a job site. WHY THIS APP • Every formula runs locally — no internet connection required to calculate • Clean, modern interface built for quick entry in the field • Search across every calculator instantly • Save your most-used calculators to Favorites FREE TO USE The Unit Converter is free, along with a flagship calculator from Quantity & Site, Laboratory Tests, Surveying and Design Checks — permanently, no trial period. Subscribe (monthly or yearly) to unlock the complete set of calculators, including all of Concrete Mix Design. Note: the Quick Design Check calculators are intended for fast preliminary checks and site reference. They are not a substitute for a full structural design or review by a licensed professional engineer.