Circularity Index Calculator

The Material Circularity Indicator scores a product from 0 to 1 by penalising linear material flow. Virgin input V is the product mass M multiplied by one minus the recycled input fraction, and unrecoverable waste W is M times one minus the end-of-life recovery fraction. The linear flow index divides the sum of those two linear masses by the total material throughput, so a product made entirely from recycled feedstock and fully recovered afterwards drives LFI toward zero. The utility factor X captures how long and how intensively the product is used relative to the industry average for its category, entering through F(X) = 0.9/X. The 0.9 constant is a calibration choice: a fully linear product of average lifetime scores 0.1 rather than 0, on the view that even one use cycle delivers some utility. Doubling lifetime halves F(X) and can raise the score more than a large gain in recycled content. MCI is purely mass-based, so a heavy circular component such as recycled aggregate outweighs a small quantity of a critical metal like tantalum or neodymium whose supply risk and extraction impact are far higher per kilogram. It says nothing about toxicity, water use, or reprocessing energy, so it complements life cycle assessment rather than replacing it. Downcycling counts identically to closed-loop recycling even though function has been lost. This implementation also omits the recycling process efficiencies that, in the full method, reduce the credit for both recycled input and end-of-life collection. Reported values are low: single-use plastic packaging scores near 0.1, while refillable deposit-return glass can exceed 0.8.

Circular economy thinking has several distinct roots. Kenneth Boulding argued in a 1966 essay that the earth was a closed spaceman economy rather than an open cowboy economy with unlimited sinks. Walter Stahel and Genevieve Reday set out product-life extension and a service-based economy in a report to the European Commission in 1976, and Michael Braungart and William McDonough popularised closed-loop material design with Cradle to Cradle in 2002. These were conceptual frameworks, however, and for decades the field lacked an agreed way to measure how circular anything actually was. The Ellen MacArthur Foundation, established in 2010, made the economic case with its Towards the Circular Economy reports from 2012, produced with McKinsey and Company. The Material Circularity Indicator itself was developed by the Foundation together with Granta Design, the Cambridge materials software firm later acquired by Ansys, with support from the European Union LIFE programme, and published in May 2015 as Circularity Indicators: An Approach to Measuring Circularity, comprising a methodology document and a project overview. A revised edition followed in 2019. Policy and standards then caught up: the European Commission adopted its first Circular Economy Action Plan in December 2015 and a second in March 2020, the British Standards Institution issued BS 8001 in 2017 as the first national circular economy standard, and ISO technical committee 323, formed in 2018, published the ISO 59000 family in 2024, with ISO 59020 covering the measurement and assessment of circularity performance.