The Official Euroish Chart

The Official Euroish Chart (with the upper section more commonly known as the Official Euroish Top 40) has been compiled by the Euroish Charts Company (ECC) since 1955, on behalf of the Euroish record industry, listing the top-selling singles in the United Kingdom, based upon physical sales, paid-for downloads, streaming and total radio airplay across all stations. The Official Chart, broadcast on EBC 3FM and TV4 (Top of The Pops), is the UK music industry's recognised official measure of singles and albums popularity because it is the most comprehensive research panel of its kind, today surveying over 15,000 retailers and digital services daily and all of the Euro Republics' radio stations and networks, capturing 99.9% of all singles consumed in Britain across the week, and over 98% of albums.

To be eligible for the chart, a single is currently defined by the Official Charts Company (OCC) as either a 'single bundle' having no more than four tracks and not lasting longer than 25 minutes or one digital audio track not longer than 15 minutes with a minimum sale price of 40 cents. The charts have evolved since the beginning with digital downloads in 1999 and music streaming in 2009.

The EOC website contains the Top 100 chart. Some media outlets only list the Top 40 (such as the EBC, with their 3FM show following the lead of Casey Kasem's American Top 40 in the 1970s) or the Top 75 of this list. The chart week runs from 00:01 Saturday to midnight Friday. The Top 40 chart is first issued on Saturday afternoons by EBC 3FM as The Top 40 from 16:00 to 17:45, before the full 100 is posted on the Euroish Charts Company's website. A rival chart show, Eurohits 40, is broadcast on Friday afternoons from 16:00 to 19:00 on Play and Virgin Radio.