Drill Calc vs BuildersCalcsRoof
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Drill Calc
This utility app helps you determine the correct drill bit size for threaded holes. It supports both inch and metric threads, calculates close and tight fit hole sizes, and provides tables for standard drill bit sizes and pipe information.
- Calculates drill bit size for threaded holes
- Supports inch and metric threads
- Displays close and tight fit hole sizes
- Includes standard inch fractional and numeric drill bit tables
- Provides pipe size information
- Offers data on common wood screw sizes
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Need to find the right drill bit size for a hole? Drill Calc calculates the correct drill bit size to use for threaded holes, based on the bolt (tap) diameter and thread pitch and percentage, for both inch and metric threads. Close and tight fit hole sizes for many popular drill sizes are also displayed. It also has tables of standard inch fractional and numeric drill bit sizes, as well as complete information for various pipe sizes. There is also detailed information about the commonly used sizes of wood screws. Buy your copy of Drill Calc today, and put away your drill chart.
BuildersCalcsRoof
This app eliminates guesswork for roof construction by providing precise measurements for rafters, angles, and birdsmouths. It accommodates any building size and offers both metric and imperial units, making complex roof cuts simple.
- 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
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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
Screenshots
Verdict
The clearest difference is rating: Drill Calc at 4.1 against BuildersCalcsRoof's 2.4. Drill Calc also leads on review sentiment (92% vs 50%). BuildersCalcsRoof's advantage is update cadence (every 8 months vs every 18 months) and iOS requirement (10.0 vs 12.0). On price, ratings volume, ads and in-app purchases 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
Drill Calc costs $2.99 and BuildersCalcsRoof $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Drill Calc holds the better App Store score, 4.1 against 2.4. Both are backed by a comparable volume of ratings — 19 and 8 respectively. Written reviews point the same way: 92% of Drill Calc's written reviews are positive against 50% of BuildersCalcsRoof's.
Drill Calc ships an update every 18 months, BuildersCalcsRoof every 8 months. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.
| Parameter | Drill Calc | BuildersCalcsRoof |
|---|---|---|
| Price | $2.99 | $2.99 |
| Rating | 4.1 (19 ratings) — better | 2.4 (8 ratings) |
| Positive reviews | 91.7% of reviews — better | 50.0% of reviews |
| Number of ratings | 19 — better | 8 |
| Update frequency | Every 18 months | Every 8 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Black Cat Systems | Robert Thompson |
Customer experience
Drill Calc
BuildersCalcsRoof
In-app purchases
Drill Calc
No in-app purchases
BuildersCalcsRoof
No in-app purchases
Questions
Is Drill Calc free?
Is BuildersCalcsRoof free?
Which has better reviews, Drill Calc or BuildersCalcsRoof?
Do Drill Calc or BuildersCalcsRoof have ads?
Which is updated more often, Drill Calc or BuildersCalcsRoof?
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