On the week starting 16 January 2000, "More Than I Needed to Know" debuted at number five on the UK Singles Chart, its peak position. It spent nine weeks on the UK chart and is Scooch's highest-charting single and only top-10 hit in their home country alongside their 2007 Eurovision entry, "Flying the Flag (For You)". In Ireland, the song reached number 50 on 20 January 2000, giving Scooch their first top-50 hit in Ireland. It is the band's only charting single in the Netherlands, where it peaked at number 62 in April 2000 and stayed on the Single Top 100 chart for two weeks. On the Eurochart Hot 100, the song debuted and peaked at number 27.