Crap Calculator | Sanitation Hackathon

Crap Calculator

Short description 

A tool to calculate and visualise quantities of crap, to be used to trigger disgust of crap and reduce open-defecation 

Needs statement 

The solution is to change behaviours towards sanitation. This can be done by sparking off emotions in people such as disgust of crap and raising awareness on the negative consequences of open defecation. Community-Led-Total Sanitation for instance has become a widely successful approach to increase community awareness about the consequences of open-defecation, and thereby “trigger a demand” for sanitation. Through a community meeting, individuals all acknowledge where they defecate in the open, which leads to an awareness that everyone is exposed to one another’s excreta. CLTS is designed for rural villages but similar approaches can be used in other contexts. In urban media-aware environments, phones could be a useful tool to raise and spread awareness via social media such as Facebook or Tweeter on the quantities of excreta we produce.

The need is to create a simple program that can actually estimate quantities of crap in the environment and present the total in a visual funny and appealing display such as a drawing or a graph of some sort that could be shared on social media platforms. The objective is to get viral! The tool could potentially compare volumes of crap a country, megacity or city produces in a year to something representing a large volume such as  football stadiums or cargo planes (1 year of Crap = X cargo planes), or compare weight of the crap produced to bags of rice. 1 year of Crap = X bags of rice in weight). This added level of disgust can strengthen the impact of the demand triggering process.

This program would use pre-set reference figures of the average quantity of crap a human produces in a year, population of major cities, density etc.

BONUS: It can also be used to show the value there is in waste. For example, there are often small entrepreneurs that collect sewage from pit latrines for proper disposal at treatment plants. They typically collect payment from customers or from the treatment plant. The calculator could estimate the potential profits to be turned from this waste through collection and/or re-use as fertilizer.


See examples of sanitation market initiatives:


CONTEXT: While CLTS has been more frequently used in rural areas, there is an increasing interest in using it in peri-urban and urban areas. This technology may be particularly appropriate in these contexts, where computers and smart phones and social media applications are frequently used by urban youth. This tool could also be used for people conducting CLTS or a general assessment of open-defecation.

DESIGN FEATURES: Ultimately, the program should be designed for computer and smartphones, be accessible online and offline, and have the ability to aggregate data from multiple communities.

Impact statement 

The expected outcomes are as follows:

1.      Increase the “disgust” feeling toward crap to trigger demand for sanitation even more effectively. Can be measured through monitoring open-defecation in an effort to lead to (and remain) open-defecation-free communities or urban youth.

2.      To support sanitation advocacy: The tool can be used to demonstrate to local and national leaders, as well as donors, the importance of providing community toilets, or supporting sanitation-related programs or businesses.

3.      To promote a market in waste collection and treatment: With the bonus, the tool can show the value in waste (that is otherwise wasted!) by collecting it and treating it- and where appropriate, re-using it for fertiliser after treatment.



Would also be great to have something to complement other CLTS tools such as “Shit and Shake” (where the chief covers his hand in chalk to symbolise faeces, and the shakes hands with other members of the community to show how faeces can be passed from one person to another) or 
“Food and Faeces” or “Faeces and Water” (where community members watch flies etc transfer germs from faeces to food and water).  Would also be great to have something which can be used by teachers in schools, to help children visualise the impact of open defecation.

Submitted by Dan on

Do you actually have estimates on poop per capita that can be used?

Submitted by Lenovo on

I like this one! 

It would be great if it was something very visual that facilitators in the field could use.  I think a simple fun tool that could either function on a very basic Nokia phone or a program that could be downloaded or shared via flashdrive would be great.  It would be wonderful if it was mostly picture icons so that it could be used in various countries regardless of language.


It depends on what you eat so it would be different for different average diets, but there are lots of references.  Here’s a quick one:

wow. this is awesome. as a crap calculator that is primarily used as tool to calculate and visualise quantities of crap, to be used to trigger disgust of crap and reduce open-defecation. i’m sure that who invented this gadget must have been into such kind of work. cheers.

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It is true for some extent. The technology is coming to an era of simplifying everything. I mean everything. There are going to be driverless cars. There will be mobiles which does everything you say to them. I have bad feeling that, only half of the population is going to be smarter and the other half going to be dumber….
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By |2022-07-06T11:36:32+00:00July 6, 2022|Uncategorized|0 Comments

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