OnSite Calculator: Voice-Powered Construction Math

Why We Built It

Construction math is different. You're working in feet and inches, adding fractions, converting between imperial and metric — often with dirty gloves and no free hands. The OnSite Calculator was built by a carpenter who was tired of pecking at a tiny phone screen on scaffolding.

Voice Input

The killer feature: speak your calculation. Say "twelve and three-eighths plus four and a half" and get the answer instantly. The calculator understands natural construction language — feet, inches, fractions, and common shortcuts. Works with gloves on, works in loud environments with noise cancellation.

Fraction Math Made Easy

Add, subtract, multiply, and divide fractions without converting to decimals. The calculator displays results in the most useful format: whole numbers and simplified fractions (e.g., 16 3/4" instead of 16.75"). Perfect for cutting lists and layout measurements.

Imperial ↔ Metric Conversion

Instantly convert between imperial and metric. Working with plans in millimetres but your tape reads in inches? One tap to switch. Supports feet/inches to metres/centimetres and back.

Material Estimation

Quick area and volume calculations for common tasks: square footage for flooring, board feet for lumber, concrete volume in cubic yards, and more. Enter dimensions and get quantities with waste factor built in.

How to Get Started

OnSite Calculator is available on Google Play and App Store. Free tier includes basic calculator functions. Pro ($9.99/month) unlocks voice input, saved calculations, and advanced material estimation. Try the web version at calculator.onsiteclub.ca.

Tips & Tricks

• Say "split" to divide a measurement in half — useful for finding centres.
• Say "to metric" after any result to convert instantly.
• Use "add to list" to build a cutting list as you measure.
• Shake your phone to clear the last entry.