# Ozinga Concrete Calculator — user reviews > 22 indexed App Store user reviews of Ozinga Concrete Calculator by Ozinga Ready Mix Concrete, Inc., rated 4.78/5 from 18 ratings. - Source: https://appshunter.io/ios/app/ozinga-concrete-calculator/id511467709/reviews - App overview in markdown: https://appshunter.io/ios/app/ozinga-concrete-calculator/id511467709.md - Rating breakdown: 5★ 16 · 4★ 1 · 3★ 0 · 2★ 1 · 1★ 0 ## Newest reviews (6 of 22) ### 5/5 — Easy to use! *2012-03-24* User friendly for do it yourself homeowners. ### 5/5 — Wow! *2012-03-24* Excellent app, easy to use ### 5/5 — User *2012-03-24* This is something I have been waiting for since I got my iPhone!! ### 5/5 — Rock Solid *2012-03-24* Great app. Best design. Simple to use. ### 5/5 — Great calculator *2012-03-24* Does every thing you need it to. Thanks Ozinga for a great app!! ### 5/5 — Brian *2012-03-24* Brian QC thinks this is cool!!! ## Most critical reviews (10 lowest-rated) ### 1/5 — No good!!!!!! *2017-10-15* Need to update your app for ISO 11 ### 1/5 — Use at your own risk! *2014-07-12* I calculated a concrete pour using this app, and came up painfully short (1 yard short). Talked to the concrete supplier and their numbers were much higher. I verified the numbers from the concrete supplier with a different calculator. This app is not accurate! Costing me hundreds in time and additional delivery fees. BEWARE! Even though this a visually appealing app it is worthless because the calculations are wrong. ### 1/5 — Horrible app *2012-05-16* No vale madres esta applicacion!!! It wont open up! ### 1/5 — Cal build *2012-03-28* I couldn't get loc service to enter address in project sheet. it did send accurate link when e-mailed. Also the dimensions did not carry to share.. the width was zeroed out but remained true when I went back to calc. The total stayed correct tho. It would be nice to able to save once you move on the last project is gone. Unless you email to yourself of coarse. With out the ability to catalog you are unable to total the entire job ex: footing/slab/fwork/. If you have to send or write down multiple calc's then total for job why not just use a standard calc? Sending 3 emails for the same job can cause mistakes. ### 2/5 — Where’s metric *2017-11-14, version 2.0.2* Got this app but it needs the ability to switch to metric as most Concrete companies here in Canada are dispatching Concrete in meters NOT yards. ### 2/5 — Ozinga *2012-12-09* Kinda useless. Most idiots can calculate cubic yards. Looking for an app that will calculate bags of concrete needed ### 5/5 — Best app ever!! *2022-01-13* I love this concrete calculator! Makes my job much easier!! Thank you for the amazing free app!! ### 5/5 — Update *2017-10-16* Need update ### 5/5 — Please update for new iPhone update *2017-10-13* I use this app multiple times a day and I love it. Very accurate. Need to update for new iPhone software update. Please hurry ### 5/5 — Contractor *2017-10-10, version 1.0* Excellent results every time ## Most praised reviews (6 highest-rated) ### 5/5 — Great app, *2017-10-08* Great app! Just it doesn’t work anymore without the new update that happened to all I-Phones iOS 11 Please fix it. ### 5/5 — Contractor *2012-05-21* Great application from a great company. Keep up the great work. ### 5/5 — Great app! *2012-03-26* Great for do it yourself homeowners. Easy to use. ### 5/5 — Great App! *2012-03-25* Easy to use, handy for use at the job site, great app. ### 5/5 — Love the GPS and Photo Feature *2012-03-25* Coolest free calc I have found. ### 5/5 — Easy to Use & Great to Catalog Projects *2012-03-24* The app is really easy to use... A lot more user friendly than others I have tried. I love the GPS feature so I don't have to fidget with finding an address when I am on the job and spend time typing it in. I can enter all the job info, even take a picture, then send it to my email so I can keep track of my different projects. Awesome! --- *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 2026-06-08.*