# Cable Calc — Cable Size Calculator > Electrical cable size calculator based on BS 7671 standards. (iPhone/iPad app by Pro Certs Software Ltd.) - Source: https://appshunter.io/ios/app/cable-calc/id1044306956 (this page in markdown: same URL + `.md`) - Developer: [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) - Category: Productivity, Reference - Price: $14.99 - Age rating: 4+ - Requires: iOS 11.0 · 3 MB - Languages: American English - Released: 2015-10-10 - Data updated: 2026-08-31 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/cable-calc/id1044306956/reviews.md ## What is Cable Calc? A cable size calculator based on BS 7671 for calculating single phase and three phase radial circuits and single phase ring final circuits. Calculate the minimum required cable size based on the tables within BS 7671 and print or save the results. STEP 1: Enter your design criteria and select a cable type. STEP 2: Select an installation method, ambient temperate and grouping. Option to enter a circuit reference and circuit description. Option to enter a client name and installation address. Option to add a signatory. Check out our full collection of electrical apps & software packages for electricians at https://www.procertssoftware.com/apps/ ## Key features - Calculate single and three-phase radial circuits - Calculate single-phase ring final circuits - Based on BS 7671 standards - Enter design criteria - Select cable type, installation method, ambient temperature, and grouping - Save or print results - Add circuit and client details ## Recent user reviews (10 of 12) All indexed reviews: https://appshunter.io/ios/app/cable-calc/id1044306956/reviews.md ### 3/5 — Don’t waste your money *2025-04-27* Not very good it’s just made to generate more sales ### 1/5 — Incorrect response *2024-03-23* App developer stated in response that only SWA cable types can be installed on ladder or tray. This is incorrect, BS7671 Tables 4D1A & 4E1A permit installation of unarmoured cable on tray or ladder. Methods F&G. There are occasions where I do not want SWA cable. The App only gives an option for installation of unarmoured cables in or on wall. **Developer response:** Hi, In accordance with BS 7671 the permitted installation reference methods are dependant on the selected cable type, for example single insulated cables cannot be installed on cable tray. If you select an SWA cable then the relevant installation methods are shown for that cable type such as cable tray, free air ect… ### 1/5 — Works ok but ads are too distracting *2023-12-05* As above, would use it more if not for the bombarment of advertising nonsense. **Developer response:** There aren’t any ads in this app, think you have confused this with a different app as there isn’t any ads in this app. ### 1/5 — Very limited *2021-07-15* If you want to do anything big (>800A) then forget it. ### 2/5 — Problems *2021-02-21* On step 2, there is a problem where you can not select the ambient temp without clicking on the two options below first. This needs fixing. (It says “no option”) To improve this app, it would be helpful to allow you to select the wrong cable, and tell you which part doesn’t comply, and then you “+1 size” until the cable is compliant, where as you can not see the information now until you “go up a size”. I.e. if the volt drop was none compliant etc, this would be useful but I guess may be difficult (and maybe not what it was designed for). I just thought I would feed this back. **Developer response:** Hi, the ambient temperature options depend on your selected installation method (ambient temp or ground temp), hence why you need to select an installation method first and why the Installation Method option is before the Ambient Temperature option. - It the designers responsibility to select a suitable cable type for its intended use. - When calculating a cable size if something does not comply you get a hint "Volt Drop Compliance Not Met: Try next size up" or "Max Zs Not Met: Try next size up?" ### 1/5 — No good *2021-01-28* 20A single phase circuit, in singles installed in trunking, 75M and its giving me a cable size of 70mm 😂 **Developer response:** Other parameters also apply to calculating cable sizes such as Ze, max Zs, grouping and Volt drop, not just design current and cable length. For example if your Ze is 1.70 and your PD is 20A MCB type B the max Zs (80%) is 1.75 - therefor it will require a very large cable to satisfy the Max Zs due to a high Ze. Feel free to email us your calculation to support@pro-certs.com ### 3/5 — Rich *2020-10-28* It good but needs ring /radial circuits allowance! **Developer response:** Hi, ring final circuits have been added. ### 5/5 — Excellent *2020-05-04* Great fast calculating tool very accurate **Developer response:** Thank you for your feedback. ### 5/5 — Great App *2020-04-19* I personally have not had a problem with this app. It’s a really useful app for those who want to check cable requirements on the fly. **Developer response:** Thank you for your feedback. ### 1/5 — D Evans *2020-02-20* Worst cable calc app, tried getting the cable size for a 209amp circuit would not do it so I tried a smaller circuit and it recommended 16mm T&E for a 25 amp supply covered by a 32amp rcbo **Developer response:** Other parameters also apply to a cable calculation (other than just the rating) such as the Ze, max Zs, volt drop, cable resistance and installation methods. A high Ze or long circuit will increase the required cable size. Correction factors also have an effect on the cable size. Can you send your calculation requirements to support@pro-certs.com ## Frequently asked questions about Cable Calc ### What is the price of Cable Calc? Cable Calc is a paid application priced at $14.99. This one-time purchase grants you access to all its features for calculating cable sizes. ### Does Cable Calc have ads? No, Cable Calc is ad-free. You can use the application without any interruptions from advertisements. ### On which devices can I use Cable Calc? Cable Calc is available for iPhone, iPad, and iPod touch devices. It is designed to run on Apple's iOS ecosystem. ### How often is Cable Calc updated? The latest version of Cable Calc is 2.1.35, last updated on September 6, 2025. Updates typically include improvements and adherence to the latest standards. ### What electrical standards does Cable Calc follow? Cable Calc is based on the BS 7671 standards for calculating cable sizes. This ensures compliance with relevant electrical regulations. ### Can I save the results from Cable Calc? Yes, you can print or save the calculated cable size results directly from the application. This allows for easy record-keeping and reporting. ### What information can I input into Cable Calc? You can enter design criteria, select cable types, installation methods, ambient temperature, and grouping. You can also add circuit references, descriptions, client names, and installation addresses. ### What is the age rating for Cable Calc? Cable Calc has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content. ## Version history (last 5 releases) ### 2.1.35 — 2025-09-06 04/09/2025 v2.1.34 This brand new version has been completely redesigned and rebuilt from scratch. - More cables added. - More installation methods added. - Tips and guides to help you along the way. - Single phase and three phase cable calcs. - Radial circuits and ring final circuits. - References the tables in BS 7671. - References to specific regulation numbers. ### 2.1.34 — 2024-12-12 12/12/2024 - 2.1.34 - Fixed "try next size up" not working. ### 2.1.30 — 2023-10-26 - Fixed a bug where on rare occasions the name was missing from the PDF. - Added the ability to set the Client Name and Client Address for the PDF. - Improved PDF print layout. - Improved UI. ### 2.1.28 — 2022-09-11 Added the ability to enter your own maximum volt drop value in addition to the standard 3% and 5% values. ### 2.1.26 — 2022-06-16 Cable Calc: Some optimisations and a dark mode bug fix. ## Apps similar to Cable Calc | App | Rating | Price | Category | | --- | --- | --- | --- | | [MobileEOM](https://appshunter.io/ios/app/mobileeom/id1466201917) | 5.0 (1) | Free | Productivity | | [Verifi - Accuracy Record](https://appshunter.io/ios/app/verifi-accuracy-record/id1363093208) | 5.0 (2) | Free | Productivity | | [KEWPAT](https://appshunter.io/ios/app/kewpat/id1348350148) | — | Free | Productivity | | [iCertifi Cloud Pro](https://appshunter.io/ios/app/icertifi-cloud-pro/id6744922627) | — | Free | Productivity | | [Clik Cert Electrical](https://appshunter.io/ios/app/clik-cert-electrical/id1445553180) | — | Free | Productivity | | [Tradecert: AI Electrical Certs](https://appshunter.io/ios/app/tradecert-ai-electrical-certs/id6502862218) | — | Free | Productivity | ## More apps by Pro Certs Software Ltd - [Watts Amps Volts Calculator](https://appshunter.io/ios/app/watts-amps-volts-calculator/id450813841) - [kVA Calculator](https://appshunter.io/ios/app/kva-calculator/id467407057) - [Max Zs Values](https://appshunter.io/ios/app/max-zs-values/id498838137) - [Electrical Tools and Reference](https://appshunter.io/ios/app/electrical-tools-and-reference/id564264558) - [R1+R2 Zs Ze Calculator](https://appshunter.io/ios/app/r1-plus-r2-zs-ze-calculator/id572416784) - [Fault Current Calculator (PFC)](https://appshunter.io/ios/app/fault-current-calculator-pfc/id577611194) All apps by Pro Certs Software Ltd: https://appshunter.io/developer/444429696 ## Related topics [cable sizing](https://appshunter.io/ios/topics/cable-sizing) · [vfd cable sizing calc](https://appshunter.io/ios/topics/vfd-cable-sizing-calc) · [elsewedy cable sizing](https://appshunter.io/ios/topics/elsewedy-cable-sizing) · [cable size calculators](https://appshunter.io/ios/topics/cable-size-calculators) · [megger](https://appshunter.io/ios/topics/megger) --- *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 2026-08-31.*