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The UK Singles Chart began to be compiled in 1952. The Official Big Top 40 is based on Apple data only, (Apple Music streams and iTunes downloads) plus commercial radio airplay across the Global radio network. A rival chart show, The Official Big Top 40, is broadcast on Sunday afternoons from 16:00 to 19:00 on Capital and Heart stations across the United Kingdom. The Top 40 chart is first issued on Friday afternoons by BBC Radio 1 as The Official Chart from 16:00 to 17:45, before the full Official Singles Chart Top 100 is posted on the Official Charts Company's website. The chart week runs from 00:01 Friday to midnight Thursday. Some media outlets only list the Top 40 (such as the BBC, with their Radio 1 show following the lead of Casey Kasem's American Top 40 in the 1970s) or the Top 75 (such as Music Week magazine, with all records in the Top 75 described as 'hits') of this list. The OCC website contains the Top 100 chart. The rules have changed many times as technology has developed, the most notable being the inclusion of digital downloads in 2005 and streaming in July 2014.

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 pence. The Official Chart, broadcast on BBC Radio 1 and MTV (Official UK Top 40), 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, capturing 99.9% of all singles consumed in Britain across the week, and over 98% of albums. The UK Singles Chart (currently titled the Official Singles Chart, with the upper section more commonly known as the Official UK Top 40) is compiled by the Official Charts Company (OCC), on behalf of the British record industry, listing the top-selling singles in the United Kingdom, based upon physical sales, paid-for downloads and streaming.

For the TV programme which ran from 2002 to 2005, see UK Top 40 (TV series).

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