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Best Free Stair Calculator Apps

230+ iOS apps curated and reviewed

4.6 avg rating
20 free apps
Updated July 2026

Finding the right free stair calculator apps can be overwhelming with so many options. We've analyzed 230+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.

Compare top Free Stair Calculator Apps (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Stair Calculator ProStair Calculator ProFreeβ€”NoYesJul 2026
2RedX Stairs - 3D CalculatorRedX Stairs - 3D CalculatorFree4.5β˜… (405)NoYesAug 2026
3Stair Calculator: ConstructionStair Calculator: ConstructionFree4.1β˜… (732)YesYesJul 2026
4Stair Calculator .Stair Calculator .Freeβ€”YesYesJul 2026
5Construction Master Pro CalcConstruction Master Pro CalcFree4.8β˜… (39K)NoYesAug 2026
6Stair Calculator: Run & RiseStair Calculator: Run & RiseFree4.1β˜… (33)NoYesJul 2026
7Construction Calculator Pro #1Construction Calculator Pro #1Freeβ€”NoNoJul 2026
8Feet and Inches CalculatorFeet and Inches CalculatorFree4.6β˜… (401)YesYesAug 2026

Top Picks for Free Stair Calculator

RedX Stairs - 3D Calculator#2

RedX Stairs - 3D Calculator by RedX Technology Inc

Design & Calculate Stairs
Strong Contender
πŸ”§ Utilities
4.5😞(405 ratings)
FreeIn-App Purchases
RedX Stairs - 3D Calculator screenshot 1
RedX Stairs - 3D Calculator screenshot 2
RedX Stairs - 3D Calculator screenshot 3
RedX Stairs - 3D Calculator screenshot 4
RedX Stairs - 3D Calculator screenshot 5

This app simplifies complex stair calculations and designs with advanced 3D visualization. It offers a comprehensive suite of calculators for various stair types, supporting multiple measurement units and providing detailed, to-scale plans for professionals and DIYers.

What We Love

  • πŸ‘ Great for pros and new users
  • πŸ’‘ Detailed project PDFs
  • πŸ’‘ Excellent for riser stairs
  • πŸ’‘ Handles complex stair designs

Room to Improve

  • πŸ‘Ž App gets stuck on opening screen
  • πŸ‘Ž Scam to charge $60
  • πŸ‘Ž Subscription expired, can't view/edit
Stair Calculator: Construction#3

Stair Calculator: Construction by Phan Nhat Đang

Step, Run, Rise, Angle, Length
Worth Considering
πŸ”§ Utilities
4.1😞(732 ratings)
FreeAdsIn-App Purchases
Stair Calculator: Construction screenshot 1
Stair Calculator: Construction screenshot 2
Stair Calculator: Construction screenshot 3

This app calculates essential parameters for stair construction, offering flexibility in input and providing multiple step set options. It supports various units and allows results to be easily copied.

What We Love

  • πŸ‘ Easy to use
  • πŸš€ Helpful information
  • πŸš€ Provides useful calculations

Room to Improve

  • πŸ› Doesn't work as expected
  • πŸ”’ No way to cancel subscription
  • πŸ”’ Difficult to cancel trial

More Free Stair Calculator apps to explore

4
Stair Calculator .
Stair Calculator .
Stair Calculator .
stair stringer calculator
Free
πŸ”§ Utilities
(0)
5
Construction Master Pro Calc
Construction Master Pro Calc
Construction Master Pro Calc
Feet Inch Fraction Calculator
Free

This app is a powerful construction calculator designed for professionals working with dimensions. It offers a wide range of solutions for dimensional math, right angle calculations, area and volume, and special functions, helping to improve speed and accuracy in layouts, bids, and estimates.

Dimensional math and conversionsRight angle and rafter calculationsArea and volume solutions
πŸ”§ Utilities
(39K)
free with in-app purchases
6
Stair Calculator: Run & Rise
Stair Calculator: Run & Rise
Stair Calculator: Run & Rise
Stair Calculator - Stringer
Free

This app offers tools to simplify stair design and construction calculations. It visualizes stair appearance based on total run and rise, allowing adjustments to the number of steps and their dimensions. Results can be easily shared.

Stair design visualizationCalculate riser heightStair slope in degrees
πŸ”§ Utilities
(33)
free
7
Construction Calculator Pro #1
Construction Calculator Pro #1
Construction Calculator Pro #1
Feet to inch conversion & more
Free

This app provides advanced construction math tools for builders and contractors. It offers precise calculations for framing, material estimation, and complex angles, helping to reduce errors and save time on the job.

Dimensional conversions (feet-inch, decimal, metric)Rafter, stair, and angle calculationsArea, volume, and material estimations
πŸ”§ Utilities
(0)
free
8
Feet and Inches Calculator
Feet and Inches Calculator
Feet and Inches Calculator
Perfect Construction Calc!
Free

A powerful construction calculator designed for tradespeople. It offers a wide range of tools for estimating, layout, framing, and jobsite calculations, helping to save time and improve accuracy. Supports both imperial and metric units.

Construction math and estimatingLayout, framing, and jobsite calculationsImperial and metric unit conversion
πŸ”§ Utilities
(401)
free with in-app purchases
9
Construction Master 5 Calc
Construction Master 5 Calc
Construction Master 5 Calc
Feet Inch Fraction Calculator
Free

This app is a powerful feet-inch-fraction calculator designed for construction professionals. It offers advanced calculation capabilities for layouts, bids, and estimates, simplifying complex measurements and conversions for enhanced project accuracy and efficiency.

Feet-inch-fraction calculationsRight angle and rafter calculationsArea and volume solutions
πŸ”§ Utilities
(13K)
free with in-app purchases
10
Construction Calculator
Construction Calculator
Construction Calculator
Feet Inch Calculator
Free

This app is a powerful calculator designed for construction and woodworking professionals, as well as students. It simplifies calculations involving feet, inches, and fractions, offering conversions between various measurement units and displaying equations and results simultaneously. Advanced features are available through optional in-app purchases.

Decimal to fraction converterFraction to decimal conversionSimultaneous equation and result display
πŸ”§ Utilities
(554)
free with in-app purchases
11
CMM Stair Rail Calculator
CMM Stair Rail Calculator
CMM Stair Rail Calculator
Tool for fence contractors
Free
πŸ”§ Utilities
(0)
12
Calculator #
Calculator #
Calculator #
Scientific Calculator
Free

This multi-function calculator offers basic to advanced scientific and algebraic computations. It includes features like handwriting recognition, equation solvers, and 2D graphing, making it suitable for students and professionals. In-app purchases unlock advanced capabilities.

Math Photos SolverHandwriting RecognitionAI Math Problem Solver
πŸ”§ Utilities
(36K)
free with in-app purchases
13
Basic Calculator+
Basic Calculator+
Basic Calculator+
Basic Four Function Calculator
Free

Perform essential arithmetic operations with a straightforward calculator app. Its large buttons and clear display ensure ease of use, supporting both portrait and landscape orientations.

Basic four functionsClear displayLarge buttons
πŸ”§ Utilities
(243K)
free with in-app purchases
14
Calculator for iPad!
Calculator for iPad!
Calculator for iPad!
Basic & Scientific Calculator
Free

This app offers both basic and scientific calculation modes with over 30 scientific operations. It allows for customization of the app's appearance and includes features for note-taking, drawing, and viewing calculation history. It supports high accuracy calculations and nested parentheses.

Basic and scientific calculator modesOver 30 scientific operationsCustomizable appearance (iPad)
πŸ”§ Utilities
(60K)
free
15
Calculator‰
Calculator‰
Calculator‰
Default Calculator
Free

This utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.

Large buttonsClear displayFast calculations
πŸ”§ Utilities
(404K)
ad-supported
16
Calculator with History +
Calculator with History +
Calculator with History +
No ads & Scientific calculator
Free

This free calculator app offers a fast, ad-free experience with a visual input and calculation history. Customize your experience with various keyboard sounds and colors, and access advanced scientific functions when needed.

Ad-free experienceCalculation historyVisual input
πŸ’° Finance
(25K)
free with in-app purchases
17
Calculator: No Ads / Ad-Free
Calculator: No Ads / Ad-Free
Calculator: No Ads / Ad-Free
Basic, Scientific & Finance
Free

This app offers a private and accessible calculation experience with no advertisements. It includes scientific, financial, and basic calculation functions, along with features like voice feedback and visual charts for loans and investments.

Scientific calculatorFinancial calculator (budgets, loans, mortgages)Audible speech feedback
πŸ”§ Utilities
(4.5K)
free with in-app purchases
18
CalculatorΒ·
CalculatorΒ·
CalculatorΒ·
Big Basic Calculator
Free

This app offers a straightforward calculation experience, focusing on essential functions without unnecessary complexity. It includes basic arithmetic, percentage calculations, and advanced functions like square root. Users can customize the appearance with multiple color schemes and utilize features like result copying and split-screen multitasking on iPad.

Basic arithmetic operationsPercentage calculationsMultiple color schemes
πŸ”§ Utilities
(33K)
free with in-app purchases
19
Calculator Pro Lite
Calculator Pro Lite
Calculator Pro Lite
Best Calculator
Free

A highly customizable calculator app offering a modern interface and extensive features. Personalize themes, button layouts, and visual elements. Track your calculations with a detailed history and access scientific functions.

Customizable themes and colorsDual-line displayCalculation history
πŸ”§ Utilities
(3K)
ad-supported
20
The Chippy Calc: Builder Tools
The Chippy Calc: Builder Tools
The Chippy Calc: Builder Tools
Stairs, Decks, Rafters, Walls
Free

This app provides carpenters, builders, and DIYers with precise, visual construction calculations. It offers specialized tools for stairs, decks, rafters, and more, with support for both metric and imperial units. All calculations can be saved and accessed offline.

Visual results with scaled diagramsMetric and imperial unit supportOffline functionality
πŸ”§ Utilities
(2)
free with in-app purchases