# LCt50 Calculator > Calculates LCt50 for chemical agents in enclosed spaces based on dimensions and agent amount. (iPhone/iPad app by Pearson-Cole Software.) - Source: https://appshunter.io/ios/app/lct50-calculator/id457980287 (this page in markdown: same URL + `.md`) - Developer: [Pearson-Cole Software](https://appshunter.io/developer/457980290) - Category: Utilities, Reference - Price: $4.99 - Rating: 3.70/5 from 6 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 4 MB - Languages: American English - Released: 2011-08-27 - Data updated: 2026-07-09 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/lct50-calculator/id457980287/reviews.md ## What is LCt50 Calculator? Utility for determining three different lethal concentration and time (LCt50) calculations when using chlorobenzalmalononitrile (CS) non-lethal chemical agent inside a structure. The formulas are based on a government study using animals and soldiers to determine the amount of agent that will likely kill 50% of the people in a closed sealed space using the amount of agent and time as a factor. The app's easy-to-use forms require the user to enter the length, height and width of a structure, along with how much agent was used. If you want to determine the amount of the agent you can safely use in a building, the app will tell you the LCt50 after one simple numeric entry by the user. You can also determine how much agent to use for any LCt50 you want to establish. Every team leader responsible for the delivery of chemical agents can make use of this app. ## Key features - LCt50 calculation - Structure dimension input - Agent amount input - Determine safe agent usage - Calculate agent for desired LCt50 ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/lct50-calculator/id457980287/reviews.md ### 3/5 — Works but needs an update... *2020-06-09* Needs a major update. Pretty buggy and the UI looks like it was designed to fit older iPhones with smaller screens. Gets the job done but definitely needs some work. ### 2/5 — Not great for iPhones *2018-09-29* Bought this app five years ago (2013) and had no issues. Recently went back to gas school and found it’s not really compatible anymore. Shows less features and will shut down. Guy in my class had an android and it worked flawlessly. Just a heads up. It’ll give you basics, but no more than the simple math you can just do on your calculator. ### 3/5 — Great ap *2012-07-27* Would like to see also the calculation for ICT50 as well as the data sheet on the munition. ### 5/5 — Must have for gas guys *2012-05-01* Great app that saves time on callouts. Easy to use. ### 5/5 — A must have *2012-04-23* Great app and a must have for all gas guys or any tactical operator deploying with gas. Very easy and quick to use. How about a munitions data card app? ### 4/5 — Been waiting a long time for this... *2011-09-02* Great app!!!! Very easy to use!! Would like to see munition selection option in future update(s). ## Frequently asked questions about LCt50 Calculator ### What is the LCt50 Calculator used for? The LCt50 Calculator is a utility for determining lethal concentration and time (LCt50) when using chemical agents inside a structure. It helps calculate safe amounts of agent or the agent needed for a specific LCt50. ### How does the LCt50 Calculator work? You input the length, height, and width of a structure, along with the amount of agent used. The app then calculates the LCt50 based on these inputs and government study formulas. ### Who is the target audience for the LCt50 Calculator? This app is designed for team leaders responsible for the delivery of chemical agents. It aids in making informed decisions regarding agent usage and safety in enclosed environments. ### What devices is the LCt50 Calculator available on? The LCt50 Calculator is available for iPhone, iPad, and iPod devices. ### How much does the LCt50 Calculator cost? The LCt50 Calculator is a paid application, priced at $4.99. ### When was the LCt50 Calculator last updated? The LCt50 Calculator was last updated on November 9, 2017, with version 1.2. ### What is the age rating for the LCt50 Calculator? The LCt50 Calculator has an age rating of 4+, making it suitable for a wide range of users. ### Does the LCt50 Calculator have ads? No, the LCt50 Calculator does not contain advertisements. ## Version history (last 3 releases) ### 1.2 — 2017-11-09 This app has been updated by Apple to display the Apple Watch app icon. 64-bit support. Price increase due to the agonizing process Apple puts developers through just to rebuild their apps with zero code change just to support newer devices/OS versions. Get it on Android for free since it doesn't cost $100/year and weeks of my life just to maintain this simple app there. NOTE: Apple couldn't make the process of rebuilding the application "just work", and as a result, the tab buttons no longer have labels. I've spent far too many hours trying to figure out how to fix something that would never have been broken on any other company's watch in the history of software production, so it's just going to have to remain as is. ### 1.1 — 2011-09-02 Renaming app, updating labels, screenshots, description, keywords. ### 1.0 — 2011-08-26 No release notes. ## Apps similar to LCt50 Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [LiveWire ·](https://appshunter.io/ios/app/livewire/id1439622712) | 4.3 (12) | Free | Utilities | | [Caseify](https://appshunter.io/ios/app/caseify/id6474043513) | 4.8 (208) | Free | Utilities | | [iVe-Mobile](https://appshunter.io/ios/app/ive-mobile/id1318716827) | 4.6 (11) | Free | Utilities | | [GeoBallistics](https://appshunter.io/ios/app/geoballistics/id972536756) | 4.0 (226) | Free | Utilities | | [Flock Safety](https://appshunter.io/ios/app/flock-safety/id1667653638) | 4.9 (7,190) | Free | Utilities | | [Bounce Viewer](https://appshunter.io/ios/app/bounce-viewer/id1001843752) | 5.0 (6) | Free | Utilities | ## Related topics [lct50 calculator](https://appshunter.io/ios/topics/lct50-calculator) · [lct50](https://appshunter.io/ios/topics/lct50) --- *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 2026-07-09.*