# MathTappers: Carbon Choices — Track your carbon footprint

> Educational app for students to track carbon footprint from daily choices. (iPhone/iPad app by Tim Pelton.)

- Source: https://appshunter.io/ios/app/mathtappers-carbon-choices/id386999548 (this page in markdown: same URL + `.md`)
- Developer: [Tim Pelton](https://appshunter.io/developer/1238345905)
- Category: Education, Lifestyle
- Price: Free
- Rating: 3.30/5 from 4 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 7 MB
- Languages: American English
- Released: 2010-08-22
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/mathtappers-carbon-choices/id386999548/reviews.md

## What is MathTappers?

Our MathTappers: Carbon Choices app is designed to help users (middle school students) become more aware of the amount of C02 equivalent (C02e) pollution introduced by some their lifestyle choices.  Note, to keep things simple, many sources/choices are not included in this app (e.g., heating/AC, non-food consumables, etc.), rather it is focussing on only a few of the consumption choices that middle school students might typically be making. Users begin by tracking/estimating their consumption over a week in four main areas (showers, entertainment, travel and food). Their impact is then assessed in terms of an estimate of the annualized kg of CO2e generated across those consumption areas. 

Climate change, greenhouse gases (GHG), C02e, etc. are fuzzy terms to most of us. We know that they describe a problem, but we can’t easily define them or interpret the magnitude of the numbers that we hear. This app is intended to support students in building a sound understanding of the numeric values associated with these terms (i.e., develop referents). MathTappers:CarbonChoices takes everyday activities (i.e., bathing, eating, transportation, entertainment) and helps students to make the connection between their everyday choices (e.g., minutes in the shower, km travelled by car, type of food consumed, etc.) and the kg of C02e that will be emitted if they repeat those choices over a year.

When using this app to estimate the carbon footprint of these few choices,  users will typically see values in the range 1000-4000 kg of C02e each year By understanding how many kg of C02e they are responsible for through their personal actions and choices – students will find the issue of climate change and greenhouse gas to be less abstract as well as easier to discuss and address. (Note: when all factors are considered it is estimated that the average North American lifestyle is responsible for the generation of about 20 tonnes of CO2e each year; see https://ourworldindata.org/per-capita-co2 ).

This app is specifically designed to support the recording of activities, contexts and choices common to youth. Specifically users can describe their:
(a) shower in terms of flow rate, input temperature, output temperature and duration
(b) food choices in terms of consumption of high, medium and low impact foods
(c) transportation in terms of vehicle fuel economy, vehicle fuel type and the number of kilometers driven at their request or on their behalf
(d) entertainment in terms of system wattage consumed when operated and time used and discover the kg of CO2e that their choices would generate over a year.

Design: Tim Pelton, Justin Longo, Leslee Francis Pelton & Joshua E. Smith
Programming: Joshua E. Smith

The designers of the MathTappers apps are math educators and researchers seeking to create simple games that will help learners to make sense of mathematics one concept at a time. We have designed MathTappers apps to support students in learning mathematics by providing relevant visual models, focused content linked games and helpful suggestions for parents and educators.

Please check out all of our MathTappers apps (links found at MathTappers.com):

MathTappers: MultiMatch--a matching app that challenges learners to match sets of cards placed on the table. Although it comes with a deck and you can download others from our website, it was really designed to encourage teachers and students make and share their own matching game decks to capture their understanding and challenge others.  
MathTappers: Clock Master--learn to tell time 
MathTappers: Estimate Fractions--make sense of fraction sums and differences 
MathTappers: Find Sums--learn basic facts for addition and subtraction
MathTappers: Multiples--learn basic facts for multiplication and division
MathTappers: Equivalents--equivalent fractions, decimals and percents
MathTappers: FindAngle--find relative positions of angle arms for specified angles

## Key features

- Track consumption in four key areas
- Estimate annual CO2e emissions
- Understand impact of daily choices
- Focus on youth-relevant activities
- Detailed tracking for showers, food, travel, and entertainment

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/mathtappers-carbon-choices/id386999548/reviews.md

### 1/5 — Good idea

*2015-06-17*

No luck:(

### 2/5 — Would be great if

*2015-06-12*

I enter a user name to get started and the keyboard stays put!! Can't see a thing or navigate. But what a great idea.

### 5/5 — Eco freaks

*2011-03-23*

Ha, got a big foot and thanks to this app I've found areas to improve. Soon I'll have a huge foot print!

### 2/5 — Good idea, needs work

*2010-11-15*

This app would be much better if it covered a more comprehensive array of environmentally-impactful lifestyle choices (other forms of transportation such as bus or train, for example), and if it had time-frame options, so that you could track your lifestyle choices over an ongoing period of time. Additionally, the information screen is WAY too long and should be divided up based on which screen you are accessing it from.

### 4/5 — Mathtappers-carbon choices

*2010-08-24*

Carbon Choices is actually more interesting than I thought it would be. It is pretty fun to input your info and see how everything compares. Interesting and amusing.

## Frequently asked questions about MathTappers

### What is MathTappers: Carbon Choices?

MathTappers: Carbon Choices is an educational app designed to help middle school students understand their carbon footprint. It allows users to track consumption in key areas and estimates their annual CO2e emissions.

### How does MathTappers: Carbon Choices help users understand climate change?

By connecting everyday activities like showering, eating, and traveling to estimated CO2e emissions, the app makes the abstract concepts of climate change and greenhouse gases more concrete and relatable for students.

### What specific lifestyle choices can I track with MathTappers: Carbon Choices?

You can track your consumption related to showers (duration, temperature), entertainment (wattage, time), travel (fuel economy, distance), and food (impact level of choices).

### Does MathTappers: Carbon Choices include all factors for carbon footprint calculation?

No, the app focuses on a few key consumption choices common to middle school students to keep things simple. It does not include factors like heating/AC or non-food consumables.

### What is the typical estimated annual CO2e range for users of MathTappers: Carbon Choices?

When using the app to estimate the carbon footprint of the included choices, users typically see values in the range of 1000-4000 kg of CO2e each year.

### Is MathTappers: Carbon Choices available on multiple devices?

Based on the available data, MathTappers: Carbon Choices is supported on iPhone and iPod devices.

### How often is MathTappers: Carbon Choices updated?

The latest version of MathTappers: Carbon Choices is 2.0, and it was last updated on June 11, 2020.

### Does MathTappers: Carbon Choices have ads?

No, MathTappers: Carbon Choices does not contain advertisements. It is a free application.

## Version history (last 4 releases)

### 2.0 — 2020-06-11

Adjustments to better suit newer screen sizes and OS.

Removal of “Share on Facebook” option – Students can accomplish this and other social media sharing with screen capture and direct sharing.

Transition to a private label, means we cannot currently support the email reporting function (please use screen capture to record current progress)

### 1.2 — 2017-09-20

- Bug fixes
- Recompiled to run on current iOS
- Transition to a private label, means we cannot currently support the email reporting function (please use screen capture to record current progress)

### 1.1 — 2011-04-08

- Enabled multiple users
- Improved stability on selecting scale values
- Added a variable setting for the CO2e per kw/h

### 1.0 — 2010-08-22

No release notes.

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## More apps by Tim Pelton

- [MathTappers: Numberline - a math game to help children learn whole numbers, integers & real numbers](https://appshunter.io/ios/app/mathtappers-numberline-a-math-game-to-help-children-learn-whole-numbers-integers-and-real-numbers/id463632109)

All apps by Tim Pelton: https://appshunter.io/developer/1238345905

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*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 2026-06-10.*