Concrete & Rebar Calculator ES

Estimate concrete pours, pre-mixed bags, CMU block walls and ASTM A615 rebar grids on the jobsite with a clear Spanish-language interface. Built for Spanish-speaking concrete finishers, masons, ironworkers and residential contractors working in US Imperial (feet & inches) or Metric (meters & centimeters) units.

>> DUAL UNIT SYSTEM ON EVERY SCREEN
— Instant switch between Feet / Inches (USA) and Meters / Centimeters
— Outputs displayed in cubic yards (yd³), cubic meters (m³), cubic feet (ft³) and bag counts

>> 4 SPECIALIZED JOBSITE CALCULATORS (IN SPANISH)
1. Slabs, Sidewalks, Patios & Driveways
— Quick slab thickness presets (4", 5", 6"), subgrade waste allowance and Ready-Mix quarter-yard truck rounding
— Exact 40 lb (0.30 ft³), 60 lb (0.45 ft³) and 80 lb (0.60 ft³) pre-mixed concrete bag totals
— Optional 5×10 ft welded wire mesh sheets or rebar grid takeoff

2. Sonotube Piers, Rectangular Footings & Solid Steps
— Cylindrical pier and post-hole volume (π × r² × h × count)
— Isolated rectangular pad footings
— Solid concrete porch stairs with rise, run, width, step count and top landing depth

3. 8×8×16" CMU Block Walls, Mortar & Core Grout
— Standard 1.125 blocks/ft² takeoff with door and window opening deductions
— 80 lb and 60 lb Type S mortar bag estimates plus core-fill grout volume (25%, 50% or 100% solid)

4. ASTM A615 Rebar (#3 to #8) & Site Mix Reference
— Single or double mat grid calculator for 12", 16", 18" and 24" o.c. spacing
— 40×bar-diameter orientation lap splice, 20-ft / 40-ft stick counts and total steel weight in lb and kg
— Field mix proportion chart (cement : sand : gravel) for 2500, 3000, 3500 and 4000 PSI concrete

>> OFFLINE JOBSITE POUR LOG (BITÁCORA)
— Save multiple pours across a project offline on your device
— View combined cubic yards and 80 lb bag totals and share clean material summaries with your crew or supplier

>> PUBLIC TECHNICAL & SAFETY REFERENCES
— Federal Highway Administration (FHWA) – Portland Cement Concrete Technical Reference: https://www.fhwa.dot.gov/pavement/concrete/
— OSHA 29 CFR 1926 Subpart Q – Concrete and Masonry Construction Safety: https://www.osha.gov/concrete-masonry

>> INDEPENDENT TOOL DISCLAIMER
This app is an independent, privately developed construction estimation utility and is NOT affiliated with, endorsed by, or connected to FHWA, OSHA, ASTM, or ACI. All calculations are volumetric estimates for planning purposes and do not replace stamped structural engineering plans or local building codes.