Manh Nguyen
I develop Construction Pro, an iPhone and iPad app for construction arithmetic, trade calculators and saved project work. The App Store listing identifies me as its developer. These pages explain the product and the arithmetic behind common measurement tasks; they do not claim that I am the professional responsible for your project’s design or code compliance.
How the guides are prepared
The guides use the app’s available controls, documented features and worked examples with explicit units. Arithmetic examples are checked against their formulas; the web calculators also have automated checks for fraction operations, unit conversion, bag rounding and invalid inputs. Product screenshots are app artwork and may differ from the version or device in your hand.
Writing and site implementation use software assistance, including AI tools. The examples, labels and links are reviewed as product documentation. External material values such as bag yield are attributed to their manufacturer. A date changes when the page receives a substantive update.
What these tools can decide
The free web tools calculate quantities from your entries. They do not determine structural member sizes, reinforcement, permitted stair geometry or local rules. Check field measurements and use the applicable project specifications and qualified advice for design decisions.
Corrections and support
For an incorrect calculation, include the tool name, inputs with units, displayed result and app version. Do not send private project records unless needed for your support request. Email the developer or visit the support hub.