Carpentry Formulator vs Staircase Mojo (metric)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Carpentry Formulator
This app provides over 150 formulas and dozens of conversions for carpenters and builders. It calculates loads on walls and headers, material quantities for projects, and dimensions for roofing and stairs. It also includes area and volume calculations for various shapes.
- Load calculations for walls and headers
- Material quantity estimation (joists, studs, concrete)
- Roofing and stair dimension calculations
- Area and volume formulas for geometric shapes
- Dozens of unit conversion tools
- Shareable calculation results
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CARPENTRY FORMULATOR contains over 150 formulas that are useful for carpenters and builders. This app calculates loads on walls and loads on headers.The app calculates space between balusters, wood needed for railings It calculates Hardwood Flooring, calculations on Board Feet and Lumber conversions. It calculates the number of Joists, Sheet Rock, Concrete and Asphalt needed. The program has special sections on Roofing and Stairs. The CARPENTRY FORMULATOR has various formulas to calculate area and volumes of differing shapes. The program also includes dozens of conversions; everything from square feet to square inches and square inches to feet of water. Every result in CARPENTRY FORMULATOR shared. In the coming months there will be updates to CARPENTRY FORMULATOR that will include additional formulas. If there are formulas you would like that are not yet included, just e-mail us and we will try to include it in our next update. LOAD ON WALLS *Load on One Story Building Truss Roof *Load on One Story Building with Attic Stick Built *Load on Two Story Building with Attic Stick Roof *Total Load on Beam *Weight Header Can Carry LUMBER CALCULATION *Cost of Hardwood Flooring *Calculating Board Feet *Lumber Conversions- Board and Linear Feet MATERIALS NEEDED *Number of Joist Required *Number of Studs Required *Sheet Rock Coverage *Asphalt Needed *Cubic Yard of Concrete Needed *Coverage from Concrete ROOFING *Shed roof *Gable roof *Hip roof on square building *Gable Roof Sheathing *Shed Roof Sheeting *Hip Roof Sheeting STAIRS *Number of risers *Unit risers *Unit run *Total run Area Formulas Include: SQUARES *Area *Perimeter *Length of the diagonal RECTANGLES *Area *Perimeter *Length of base *Height *Length of diagonal PYRAMIDS *Pyramid area *Pyramid v *Volume prism SPHERES *Area of surface *Sde of cube *Volume of sphere Cylinder: *Cylinder area *Cylinder length *Volume *Capacity *Area of Cylinder Base *Length of Cylinder CIRCLES *Circumference *Radius *Diameter of Circle *Area of circle *Arc length *Degrees of arcs *Radius of arc CONES *Lateral surface area *Total surface area Ellipse:Area Hexagon:Area Parallelogram Area 200 Conversion formulas
Staircase Mojo (metric)
Easily calculate spindle spacings for staircases and other regular spacing needs. Automatically determines stair angle and provides precise measurements adjusted for slope, with options to tweak maximum spacing for custom profiles.
- Automatic stair angle detection
- Precise spindle spacing calculation
- Adjustable maximum spacing
- Slope-adjusted measurements
- Easy-to-use interface
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A time-saving, convenient and very easy to use calculator to obtain the spindle spacings between newel posts or any situation that requires regular spacings. The stair angle is obtained automatically. Place your mobile device along the incline of the stairs and register the displayed degrees by conveniently tapping the arrow button provided. This will transfer the value to the angle entry box, so no more awkward elevation measurements and spirit levels. When you have completed filling in the 4 entry boxes then tap on the "Calculate" button to show the results with a list of spindle positions and spacing widths adjusted for the slope. You may need to tweak the regulation maximum spacing, defaulting at 98mm, to take into account turned spindles with tapering profiles. It should be noted that the underlying algorithm works out best fit within a millimeter or so. Under certain circumstances you are invited to adjust the maximum regulation width slightly and recalculate to perhaps reduce by one the number of spindles. Bear in mind that the legal maximum is 100mm in the UK. or usually 4 inches in the USA .
Screenshots
Verdict
The clearest difference is review sentiment: Staircase Mojo (metric) at 80% against Carpentry Formulator's 25%. Staircase Mojo (metric) also leads on in-app purchases (none vs 1) and iOS requirement (13.0 vs 18.6). Carpentry Formulator's advantage is price (Free vs $1.99) and rating (3.8 vs 1.0). On ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Carpentry Formulator is free to download; Staircase Mojo (metric) costs $1.99 up front. Carpentry Formulator sells 1 one-off in-app purchase. Staircase Mojo (metric) asks for nothing beyond the download.
Carpentry Formulator holds the better App Store score, 3.8 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews complicate that: 25% of Carpentry Formulator's written reviews are positive against 80% of Staircase Mojo (metric)'s, so the app with the better star average is not the one people write more warmly about.
Carpentry Formulator ships an update every 2 months, Staircase Mojo (metric) every 64 months. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.
| Parameter | Carpentry Formulator | Staircase Mojo (metric) |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 3.8 (4 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 25.0% of reviews | 80.0% of reviews — better |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 2 months — better | Every 64 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 23 MB | 103 MB |
| Age rating | 4+ | 4+ |
| Developer | Historycentral.com | Nicholas Summers |
Customer experience
Carpentry Formulator
Staircase Mojo (metric)
In-app purchases
Carpentry Formulator
- Professional Features$2.99
Staircase Mojo (metric)
No in-app purchases
Questions
Is Carpentry Formulator free?
Is Staircase Mojo (metric) free?
Which has better reviews, Carpentry Formulator or Staircase Mojo (metric)?
Do Carpentry Formulator or Staircase Mojo (metric) have ads?
Which is updated more often, Carpentry Formulator or Staircase Mojo (metric)?
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