Why is a football match 90 minutes long?
The number traces to an 1866 match between London and Sheffield, when two clubs with different customs simply agreed to play for 90 minutes — and the compromise stuck.
The short answer: a compromise in 1866
The 90-minute match is usually traced to a game in 1866 between representative teams from London and Sheffield, two early centres of football that played by somewhat different customs. With no agreed match length, the two sides simply settled on playing for 90 minutes for that fixture. The figure caught on, and as the game standardised it became the accepted duration.
Why split it into two halves
Ninety minutes is played as two halves of 45, and the split is about fairness. Teams change ends at half-time so that any advantage from the conditions — wind, a slope, sun, or a worn patch of pitch — is shared roughly equally between both sides over the match. The interval also gives players a rest and coaches a chance to regroup and adjust.
Stoppage time: making up what's lost
Because the clock never stops for substitutions, injuries or time-wasting, the referee adds "stoppage" or "injury" time at the end of each half to compensate for the minutes lost. It's an estimate at the referee's discretion, which is why added time varies from game to game — and in recent seasons officials have been instructed to add time more generously, so longer stoppage periods have become common.
When 90 isn't enough
Ninety minutes settles most matches, but knockout games that need a winner can go to extra time — two further periods of 15 minutes — and then, if still level, a penalty shootout. Regular league fixtures, though, live and die by the 90 (plus stoppage): a compromise struck between two English clubs over a century and a half ago, now the rhythm of the sport worldwide.