Construction Calculator A1 Pro

The #1 construction calculator trusted by 1M+ contractors, builders, and engineers worldwide.

CONCRETE CALCULATOR

• Slabs, footings, columns, beams, stairs & circular slabs

• Instant material quantities: cement bags, sand, gravel

• Mix ratios for any project specification

REBAR & STEEL CALCULATOR

• Bar Bending Schedule (BBS) with shape codes

• Weight calculator for all bar sizes (#3-#18)

• Lap length, cover & spacing calculations

• Steel tonnage for structural estimates

FEET-INCHES CALCULATOR

• Add, subtract, multiply, divide in feet-inches-fractions

• No decimal conversion needed

• Perfect for lumber & framing calculations

AREA & VOLUME

• 15+ shapes: rectangle, circle, triangle, trapezoid & more

• Room area, paint coverage, flooring estimates

• Excavation & fill volume calculations

UNIT CONVERTER

• Length, area, volume, weight conversions

• Construction-specific units included

PROFESSIONAL FEATURES

• Bill of Quantities (BOQ) with PDF/Excel export

• Save & organize calculations by project

• Share estimates with clients instantly

• Material cost estimation

• Company branding on reports

Built for real job sites. Used by professionals in 150+ countries.

Download now and estimate like a pro.