Build Specs
Jobsite Trade Calculators
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Fast field tools for stairs, square-up layouts, gas and water systems, deck joists, voltage drop, and wire sizing.
Build Specs turns construction sizing tables and everyday jobsite math into fast, practical field tools for contractors, tradespeople, and serious DIYers.
TOOLS INCLUDED
Stair Calculator
Calculate risers, treads, stair count, total rise, and layout. Review a detailed stringer-cut diagram and save named calculations.
Square-Up Calculator
Use the Pythagorean theorem to find a diagonal or missing side for square layouts and right triangles.
Gas Line Sizing
Quick-size natural gas and propane lines, or build a visual piping system with appliances, BTU loads, pipe lengths, and longest-length sizing guidance.
Waterline Sizing
Estimate PEX-A supply sizing from fixture demand or direct flow, and lay out separate hot and cold systems.
Deck Joist Sizing
Check common deck-joist sizing based on span, spacing, species, grade, and loading assumptions.
Voltage Drop & Wire Size
Estimate voltage drop or find a wire size that satisfies selected voltage-drop and ampacity limits.
Save supported calculations and layouts on your device. Account sign-in can sync supported saved work and subscription access across Build Specs on the web and iPhone. Sign in to use web access, sync, or the account preview.
Build Specs provides reference calculations, not engineering or code-compliance approval. Always verify final designs with local codes, manufacturer specifications, and qualified professionals when required.
Terms of Use (EULA): https://corvora.app/buildspecs/terms
Privacy Policy: https://corvora.app/buildspecs/privacy
Ratings & Reviews
New in Build Specs 1.0.7:
New Square-Up Calculator
Calculate diagonals and missing side lengths using the Pythagorean theorem, with a clear visual diagram to help square up your layout.
Other improvements:
• Undo for deleted branches, fixtures, appliances, and cleared layouts in Gas and Water System Planners.
• Clearer saved-layout selection, resumable working drafts, and separate Save changes and Save as new controls.
• Optional account sign-in, saved-work sync, shared subscription access, and account deletion in About & Support.
• Improvements to stair precision, deck and voltage calculations.
The developer, Luke Kazmierowicz, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Location
- Contact Info
- User Content
- Identifiers
- Usage Data
- Diagnostics
- Other Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Luke Kazmierowicz
- Size
- 73.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Build Specs Pro $39.99
- Build Specs Pro $9.99
- Copyright
- © 2026 Luke Kazmierowicz
