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LCt50 Calculator

LCt50 Calculator

by Pearson-Cole Software

6 ratings
6 reviews
🔧 Utilities
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Archived App (Last seen on 9 Jul 2026)

This is an archived listing of the app previously available on the App Store.

Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.

Details

  • Released
  • Updated
  • August 27, 2011
  • November 9, 2017

Features

Developer

Pearson-Cole Software
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About

This utility calculates lethal concentration and time (LCt50) for chemical agents in enclosed spaces. It uses structure dimensions and agent amount to determine safety levels or required agent quantities for a desired LCt50.

✓LCt50 calculation
✓Structure dimension input
✓Agent amount input
✓Determine safe agent usage
✓Calculate agent for desired LCt50
Show original description

What's New in LCt50 Calculator

1.2

November 9, 2017

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.

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User reviews

Most RecentHighest RatedLowest Rated

Works but needs an update...

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.
D1spositionD1sposition

Not great for iPhones

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.
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Yoc119Yoc119

Great ap

Would like to see also the calculation for ICT50 as well as the data sheet on the munition.
bmullins3bmullins3

Must have for gas guys

Great app that saves time on callouts. Easy to use.
Tom yellowTom yellow

A must have

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?
VzekeVzeke

FAQ

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.