AddSub Construction Calculator

Ditch the scrap paper and stop second-guessing your math. AddSub is the ultimate fractional calculator designed specifically for contractors, carpenters, DIYers, and tradespeople who need fast, accurate results on the job site.
Whether you’re framing a house, pouring a concrete slab, or estimating materials for a renovation, AddSub handles the complex math of feet, inches, and fractions so you don’t have to.

KEY FEATURES:
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FRACTIONAL MATH MADE SIMPLE: Add, subtract, multiply, and divide measurements in feet-inches and fractions (down to 1/16th). No more converting to decimals just to do a simple calculation.
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POWERFUL UNIT CONVERTER: Instantly convert between Imperial and Metric units, including Feet, Inches, Yards, Meters, Centimeters, and Millimeters.
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COMPREHENSIVE CONTRACTOR TOOLS (PRO):
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Area & Volume: Calculate square footage for flooring or cubic yardage for excavations.
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Board Feet: Quickly estimate lumber needs with a dedicated board-foot calculator.
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Concrete Estimator: Plan your pour with accuracy. Calculate cubic yards and the exact number of 60lb or 80lb bags needed for your project.
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Sq Ft + Waste: Calculate your total area and automatically add a 5% to 25% waste factor for tile, hardwood, or roofing.
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INSTANT HISTORY: Never lose a calculation. Access your recent results in a clean history log to review your dimensions as you work.
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PDF EXPORT & SHARE (PRO): Turn your calculations into professional PDF reports. Print them directly from your phone or share them with clients and team members via email or text.
WHY CHOOSE ADDSUB?
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CLEAN, JOB-READY UI: Our new Home Hub gives you one-tap access to every tool. No buried menus—just the tools you need, right when you need them.
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ACCURACY YOU CAN TRUST: Built for the real world, AddSub ensures your measurements are precise, helping you reduce material waste and costly errors.
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BUILT FOR SPEED: Optimized for high-performance use, the app stays interactive even during complex calculations.
UPGRADE TO ADDSUB PRO:
Unlock the full power of your digital toolbox. Pro members enjoy:
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Advanced Math: Unlock multiplication and division for fractional measurements.
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Full Access: Use all Contractor Tools and the Unit Converter.
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Professional Reporting: Export and share your history as PDF files.
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Ad-Free Experience: Focus on the job without interruptions.
Stop fighting with your standard calculator. Download AddSub today and get the job done right the first time!