RedX Construction Calculator
Feet & inch Fraction Math
Free · Designed for iPad. Not verified for macOS.
100% free. No ads, no in-app purchases. Feet and inches math with fractions, rafters, stairs and conversions. Built for the jobsite.
The 100% FREE construction calculator. REDX CALC is the feet-inch-fraction calculator for framers, carpenters, contractors and builders: rafter, stair, roof pitch and framing math with no ads, no subscriptions and no in-app purchases.
Work the way you measure: add, cut and convert full feet-inch dimensions with fractions, and switch between imperial and metric in one tap.
FEET & INCHES MATH
• Add, subtract, multiply and divide feet-inch measurements with fractions
• Adjustable fraction precision
• Instant conversion between yards, feet, inches, meters, cm and mm
• Percent, square, square root and reciprocal functions
• Memory keys and automatic calculation history
RIGHT TRIANGLES & ROOFS
• Pitch, Rise, Run and Diagonal keys: enter what you know, tap to solve the rest
• Hip/Valley and Jack rafter solvers
• Miter angles for trim and framing
STAIRS, ARCS & CIRCLES
• Stair layouts: risers, treads, stringers and the stairwell opening
• Arc solver for arched openings
• Circle facts, columns and cone volumes
DIMENSIONS
• Length, Width and Height registers for areas and volumes
• Unit-aware math keeps your results in the units you build with
KNOW-HOW BUILT IN
• Step-by-step guides for the basics, roofs, stairs, circles, conversions and more
• Light and dark mode
100% FREE. FOREVER.
No ads. No in-app purchases. No subscriptions. Every feature included.
Part of the RedX Apps family: RedX Decks, RedX Roof, RedX Walls and RedX Stairs.
Terms of Use
https://www.redxapps.com/terms-of-service
Ratings & Reviews
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The developer, RedX Technology Inc, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- RedX Technology Inc
- Size
- 20.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 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+
- Copyright
- © 2026 RedX Technology Inc