BuildCalc 4+

Construction Calculator

42nd Parallel

Designed for iPad

    • $24.99



The most advanced Construction Calculator with all the features and functions you know - and without a subscription!

What if you could take the best construction calculator and fix it. That’s right ... you love it, it has served you well, and you stand by it ... but could it do more? Could it be easier to use?

After testing by pros from around the world, BuildCalc is ready to give you more - more function and more answers with less complexity, less hassle, and less confusion.


• Advanced Baluster Function: Complete layout of railing and staircase balusters with less guess work - and with all the flexibility you need for every custom job.
• Advanced Stair function: Stair layouts for professional results - including dimensioned drawings of your Stringer, Stringer Installation, and Finished Staircase. And you can email a PDF of these drawings right from BuildCalc so you can print them or share them.
• Fence Function: Give BuildCalc a fence row length and it will tell you how many posts, rails, pickets, and or panels you need.
• Interactive Functions: The Stair, Baluster, Compound Miter, and Rafter functions are now fully interactive. Want to change input values? Change the Run? Switch between Regular and Irregular Hip Roof analysis? You can do this and your results will be updated automatically - without you needing to remember what key to press.


• You are no longer tied down to: only one brick, block or tile size for the masonry function; a fixed number of drywall sheet sizes; only one footer cross sectional area; or one size of shingles and sheathing. If you don’t see the size you want, you can add as many as you need. And for area input, you can store your custom sizes in Length x Width format, so you won’t have to do mental gymnastics to figure out what was the dimensions for that last size you stored.
• Want to cut your hip roof rafter using a miter saw ... or a circular saw using a hand-held protractor? With a tap of a button, BuildCalc will automatically switch between Miter Saw and Protractor results. BuildCalc can do this for Compound Miters, too.
• Sheathing Angles, Purlin Angles, Gable Area, Backing Angles, Plan Angles, Rough vs. Finished Stair Layout Dimensions, Stringer Throat, Stringer installation dimensions ... and a lot more not found on other construction calculators.


• Tired of having to press and press and press buttons to get the results of a calculation? BuildCalc puts an end to this. For all advanced functions, you get ALL of your results in list form with just one or two key taps.
• And, rather than having to write down those results, all advanced functions allow you to save your results - as many times as you want with a label you choose - so you can recall the complete results at your convenience. Now you can do a calculation today and two days, two weeks or two years later, it is there for you.
• Less “quirks”. Have you been annoyed by arcane key stroke sequences on other construction calculators? We are too. BuildCalc 2.1 streamlined the keystrokes to do a better job of giving you less “errors” and more results. Don’t remember what you have to enter before a Hip Rafter or Stair calculation? Well, now you don’t have to. BuildCalc will provide you with a check list of inputs and on-the-spot help to get it right.
• Drywall and Masonry “Room Mode”: If you have stored a Length, Width and Height for a room, BuildCalc will give you the Drywall or Masonry required for the walls and the ceiling / floor - with only a tap of the Drywall or Masonry button. No more pondering over complex key sequences ... it just works.


Get more results than you ever could before - including dimensioned Stringer, Stringer Installation and Finished Staircase Drawings. Drawings can then be emailed to others or printed at your convenience. Email us and we'll send you an example!

What’s New

Version 2.11.15

FIX : iPhone Home Bar overlaps [0] [.] and [=] keys, making it sometimes difficult to use those buttons or the Home Bar

Ratings and Reviews

4.7 out of 5
54 Ratings

54 Ratings

Sean B. 1970 ,

Amazing app

I rarely write reviews but after using this app for years and recommending it to someone today I felt the need to. I’ve been a professional carpenter for 34 years now and mainly build high end decks. As others have said, the stair function is amazing. What I’ve been most grateful throughout the years though is the baluster function.
One of the best tools I’ve ever purchased to say the least.
A sincere thank you to the developer from an aging and increasingly aching carpenter. You’ve made many a day easier and more profitable.

Guitar boy 🎸 ,

Better than CM Pro!

Switched to iOS and can no longer use the other companies calculator without paying a subscription. I will not pay for greed, however I will pay for a great product. And this blows the other company out of the water. They kept the same great layout but added the most tasteful features. My favorite is long press for info on that function. Great! No more going through the menu to figure out how to do an irregular calculation!

Buy it now! You won’t regret it.

Developer, thank you.

csmithstack ,

A phenomenal app that gets better.

I make my living as a carpenter and use this app all the time. It offers truly useful features that take it way beyond your typical Construction Master. Irregular hip and valley rafter layout is made simple, and the ability to print stair sections from frame to finish (with all relevant values attached) is incredible. And the developers keep making it better with truly useful improvements. Don’t let the price put you off—it’s well worth it. Love love love this app!

App Privacy

The developer, 42nd Parallel, 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.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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