# BuildersCalcsRoof

> Professional roofing calculations for rafters, angles, and dimensions. (iPhone/iPad app by Robert Thompson.)

- Source: https://appshunter.io/ios/app/builderscalcsroof/id398471596 (this page in markdown: same URL + `.md`)
- Developer: [Robert Thompson](https://appshunter.io/developer/364220435)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 2.40/5 from 8 App Store ratings · 30 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 14 MB
- Languages: American English
- Released: 2010-10-30
- Data updated: 2026-08-28
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/builderscalcsroof/id398471596/reviews.md

## What is BuildersCalcsRoof?

BuildersCalcs ROOF   With this IPhone App you can forget "Guesswork" and "Trial and Error" and make your 
steel square redundant forever and bin the headache pills, because anyone with a Pencil,Bevel and Saw can 
cut a "Hip Roof " with ease. This IPhone App is a Professional Roofing Carpenter in your pocket. Just enter 
the relevant Dimensions into the program and be instantly provided with every Rafter, Hip and Jack Rafter 
Length and Overhang Length plus all the Angle cuts and Birdsmouth Dimensions.
Will accommodate any size of Timber or Building including Small like Dolls houses / Modelwork and Large as 
in Mansions. At the tap of a button a set of Dimensions is available for you to mark out a triangle and set your
 bevel for marking out all the Angle cuts if you don't have a Protractor handy.
The program stores all your settings so you can recall them at any time.
The program works with two "Separate" modes of Entry, Metric and Imperial.
Metric Roof angles are entered in degrees.
Imperial can be entered with Slope or Degrees.
Separate comprehensive help files with each section of program.
Entry for any Timber size.
Caters for Soffit overhangs of up to 60 inches Imperial.
Any Dimension for Metric. 
Check timber sizes to Eurocode 5.
Information provided by the Program includes.

COMMON RAFTER
* Length
* Overhang Length
* Plumb cut Angle
* Seat cut Angle
* Ridge Length for Hip Roof
* Birdsmouth Dimension

HIP RAFTER
* Length
* Overhang Length
* Plumb cut Angle
* Seat cut Angle
* Side cut Angle
* Birdsmouth Dimension

JACK RAFTER
* Length
* Overhang Length
* Plumb cut Angle
* Seat cut Angle
* Side cut Angle
* Shorten each Jack Dimension 
* Birdsmouth Dimension

SETTING ANGLES
* Dimensions to create a triangle for marking out all Angles

## Key features

- Rafter, Hip, and Jack Rafter Lengths
- Angle Cuts and Birdsmouth Dimensions
- Metric and Imperial Unit Support
- Adjustable Overhangs
- Timber Size Checks (Eurocode 5)
- Stores Settings for Recall

## Recent user reviews (10 of 30)

All indexed reviews: https://appshunter.io/ios/app/builderscalcsroof/id398471596/reviews.md

### 3/5 — Degrees round wrong way

*2025-07-31*

The plum cut and seat cut angles are round the wrong way if I’m doing a 24 degree roof it’s showing the plumb cut 66 and seat 24

### 3/5 — App review

*2023-11-21*

Hey guys.
Pretty decent. Is there a section to add ridge thickness? What size are you currently assuming. 

Also coukd add Perling angles ?

Thanks

Luke 

Scrivenerscarpentry.com

### 5/5 — Brilliant app for roof framing

*2023-04-01*

Quality app never had any problems using it. I’m sure people giving negative reviews just don’t have much knowledge on roofs and are imputing wrong data. Would definitely recommend this app for roofs

### 1/5 — 🤤

*2021-06-26*

Seat cut and plumb cut still the wrong way!!! Wouldn’t trust the other measurements

### 5/5 — Great Apps

*2020-09-23*

Works great for me

### 1/5 — Zero star, does not calculate accurate common rafter length

*2020-09-13, version 1.9*

Ex. A 24’x40’ home entered with a 16” overhang gives you a 12’+16” line length. Therefore 13’-4” or 160” (13.3333 (1.111083 unit run)  on a 6” pitch or 26.57 deg.  Or (13.41 unit rise).  

(1.111083*13.41) = 14.8’. Or 14’-10 13/16”  the correct overall common rafter length. 

The app, after carefully checking all settings spits out a 15’-3” common lengths for not apparent reason after being fed all the same dimensions as well as a 26.57 degree angle for the 6/12 roof that I calculated above.

### 5/5 — Quality app

*2020-06-17*

Best roofing app I’ve used been using it for 10 years + if I could give more stars I would 👍🏻👍🏻

### 5/5 — Great app this saves hours of time 👌👌👌

*2020-05-03*

Hats off to this App 🤙

### 3/5 — Not bad

*2020-03-29*

Seat cut and plumb cut are round the wrong way. Needs updating

**Developer response:** Check out our latest update the problem you are experiencing is fully addressed in the help file because of the way the power mitre saws are marked out, when making a square cut which is 90 deg the saw will be marked 0 deg totally confusing???? resulting in some users thinking the app is at fault when it’s all down to the saw markings.

### 1/5 — Utterly useless

*2019-02-17*

Utterly useless

**Developer response:** You’ve taken the time to trash a best selling roof app so why not email us with your queries and we will definitely resolve your problems, tens of thousands of users cannot be wrong.

## Frequently asked questions about BuildersCalcsRoof

### What does BuildersCalcsRoof do?

BuildersCalcsRoof is a professional roofing calculator app that eliminates guesswork in roof construction. It instantly provides precise measurements for every rafter, hip, jack rafter, angle cut, and birdsmouth dimension, accommodating any building size.

### What are the key features of this app?

Key features include calculating lengths and angles for common, hip, and jack rafters, determining birdsmouth dimensions, supporting both metric and imperial units, allowing for adjustable overhangs, and checking timber sizes against Eurocode 5. It also stores your settings for easy recall.

### How much does BuildersCalcsRoof cost?

Based on the provided information, this application is a paid app. There are no mentions of in-app purchases or advertisements, suggesting a one-time purchase for full functionality.

### What are the use cases for BuildersCalcsRoof?

This app is ideal for professional roofing carpenters and DIY enthusiasts who need to accurately calculate and mark out complex roof structures. It simplifies the process of cutting hip roofs, ensuring precision for any timber size, from small models to large mansions.

### What units of measurement does the app support?

The app supports both metric and imperial units. For metric measurements, roof angles are entered in degrees. For imperial measurements, you can enter either the slope or degrees, and it accommodates soffit overhangs up to 60 inches.

## Version history (last 5 releases)

### 1.9 — 2020-04-11

Updated to work correctly on all iPhone screens and general improvements to the help files and made easier to use.

### 1.8 — 2018-01-02

Improved interface and updated to work correctly on iPhone x and latest iOS. Incorrect title on list of items for some roofs adjusted.

### 1.7 — 2017-12-04

Minor issues fixed for usage with latest iOS.

### 1.6 — 2016-10-18

Added new section to design different shaped roof areas that will calculate all your timber requirements, rafters, ridge, valleys and hips.

### 1.5 — 2016-07-16

Complete new section added to check timber sizes to Eurocode 5

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## More apps by Robert Thompson

- [BuildersCalcs](https://appshunter.io/ios/app/builderscalcs/id364220432)
- [BuildersCalcsImperial](https://appshunter.io/ios/app/builderscalcsimperial/id365313720)
- [BuildersCalcsPro](https://appshunter.io/ios/app/builderscalcspro/id376872052)
- [BeamsForBuilders](https://appshunter.io/ios/app/beamsforbuilders/id386379301)
- [Uvalues](https://appshunter.io/ios/app/uvalues/id425173505)

All apps by Robert Thompson: https://appshunter.io/developer/364220435

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*