Published on november 4, 2021

The Methodology Behind our Eco Stats 

written by Team thredUP


thredUP is committed to slowing down fashion waste and reducing its impact on our planet by extending the life of clothing. Every time you clean out your closet, you’re keeping clothing in use and out of landfill. Every time you buy a used item instead of new, you’re displacing the need for new clothing production and reducing your carbon, waste, and water footprints. Well done, thrifters! The positive impact of choosing used over new is real. Let us explain.

We partnered with independent research firm Green Story Inc. to help us calculate the impact of buying a used item as compared to buying a new one. You can find this info on the product detail page of every women’s item on our site. This way you can feel extra great about  snagging those like-new jeans from thredUP versus splurging on a new pair.

Savings are estimated based on the 2019 thredUP Comparative Life Cycle Assessment (LCA) study by Green Story Inc. comparing the impact of buying used via thredUP versus purchasing an equivalent new item. The numbers refer to the average fabric composition and weight of an item within a category and are not specific to a particular item.

Findings were supported by thredUP’s millions of historical data points on clothing categories and composition (hello, millions of items processed!). For more information, please see our Resale Report and our Fashion Footprint Calculator. Any questions? See our FAQs here.