This show you how to calculate energy savings that the sewing club has generated this year.

We calculated that a 100 pound person could walk at least 308.6896 miles and use up the same amount of energy that it would take to make a single pair of jeans. We arrived at this answer this way:

We assumed that a 100 pound person walking 3 mph burns about 3.1 Calories in a minute. This imformation came from :                 Then, we multiplied this times 20 minutes to get the number of Calories burned in a mile of walking, which gave us 62 Calories per mile. There are about 239 Calories in a megajoule (a megajoule is 1 million joules. A Calorie is 1000 calories. The energy iin food is measured in Calories, not calories). So, there are about 239.2344498 Calories per megajoule.

We can now calculate the number of miles a 100 pound person walks using one megajoule of energy: 3.858620157 miles per megajoule.

The other piece of information we need to know is how many megajoules of energy it takes to make a pair of jeans. This varies for each manufacturer, but based on the Levi company's published figures in <a href="http://sustainable.bizjournals.com/green/Levi_cuts_pattern_for_a_greener_bottom_line.htr">http://sustainable.bizjournals.com/green/Levi_cuts_pattern_for_a_greener_bottom_line.htr</a> we estimated at least 80 megajoules of energy is used to make a pair of jeans. This is a very conservative estimate, since it is about 20% of Lev's stated estimate.

So, our final calculation gives the number of miles walked equivalent to a single pair of jeans is 308.6896 miles for each pair of jeans.

If we assume that mending a pair of jeans kept a person from having to buy a new pair, which kept a factory from having to make that new pair, we can multiply the number of jeans we mended by 308.6896 miles to see how far a person could have walked using the amount of energy the Sewing Club saved.