Comparison

Carpentry Formulator vs Staircase Mojo (metric)

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

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.

Highlights
  • Automatic stair angle detection
  • Precise spindle spacing calculation
  • Adjustable maximum spacing
  • Slope-adjusted measurements
  • Easy-to-use interface
Features
Read full description

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

Carpentry Formulator4 screens
Staircase Mojo (metric)4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard8 real differences · 2 level
Carpentry Formulator versus Staircase Mojo (metric): the parameters behind the verdict, then further details
ParameterCarpentry FormulatorStaircase Mojo (metric)
PriceFree — better$1.99
Rating3.8 (4 ratings) — better1.0 (1 ratings)
Positive reviews25.0% of reviews80.0% of reviews — better
Number of ratings4 — better1
Update frequencyEvery 2 months — betterEvery 64 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.613.0 — better
Further details — not scored
Size23 MB103 MB
Age rating4+4+
DeveloperHistorycentral.comNicholas Summers

Customer experience

Carpentry Formulator

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews8 reviews
Positive25.0%
Neutral12.5%
Negative62.5%

Staircase Mojo (metric)

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

1 purchases

Carpentry Formulator

One-time1
  • Professional Features$2.99
None

Staircase Mojo (metric)

No in-app purchases

Questions

Is Carpentry Formulator free?
Carpentry Formulator is free to download, with in-app purchases available.
Is Staircase Mojo (metric) free?
Staircase Mojo (metric) costs $1.99, with no in-app purchases.
Which has better reviews, Carpentry Formulator or Staircase Mojo (metric)?
Carpentry Formulator is rated higher. Carpentry Formulator averages 3.8 out of 5 from 4 ratings, while Staircase Mojo (metric) averages 1.0 from 1 ratings.
Do Carpentry Formulator or Staircase Mojo (metric) have ads?
Neither Carpentry Formulator nor Staircase Mojo (metric) shows ads.
Which is updated more often, Carpentry Formulator or Staircase Mojo (metric)?
Carpentry Formulator ships an update every 2 months, and Staircase Mojo (metric) every 64 months. Most recently, Carpentry Formulator was updated on October 30, 2026 and Staircase Mojo (metric) on October 29, 2026.

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