The Decathlon is comprised of Ten (10) events. The Pentathlon is comprised of Five (5) events.

There are a combined fifteen (15) events. However, the pentathlon's five events are also encompassed within the decathlon as well. Therefore, technically there are only Ten (10) unique events between the two competitions.

5

The modern pentathlon is a sports contest consisting of five events, derived from the Greek root of pente, meaning five. The events are épée fencing, pistol shooting, 200 m freestyle swimming, a show jumping course on horseback, and a cross-country run. The epithet modern is important to discern it from the ancient athletics pentathlon - none of the events of modern penthatlon were part of the ancient Olympics. The modern pentathlon was invented by the Baron Pierre de Coubertin, the founder of the modern Olympic Games. As the events of the ancient pentathlon were modeled after the skills of the ideal soldier of that time, Coubertin created the contest to simulate the experience of a 19th century cavalry soldier behind enemy lines: he must ride an unfamiliar horse, fight with pistol and sword, swim, and run. The event was first contested at the 1912 Olympic Games, and was won by a Swede named Gösta Lilliehöök. Future American World War II General George S. Patton finished fifth. The modern pentathlon has been on the Olympic program continuously since 1912. A team event was added to the Olympic Games in 1952 and discontinued in 1992 . An event for women was added in 2000 . In non-Olympic years, a World Championship is held, instigated in 1949. Originally the competition took place over four or five days; however in 1996 a one-day format was adopted in an effort to improve the event's commercial image. In spite of the event's strong pedigree in the modern olympics, and its status as the only event created specifically for the modern olympic games, its lack of widespread popularity outside of Eastern Europe has led to calls for its removal from the Olympic games in recent years.

The shooting discipline involves using a 4.5 mm air pistol in the standing position from 10 metres distance at a stationary target. Each competitor has 20 shots, with 40 seconds between each shot. The fencing discipline uses the épée. The competition is a round-robin, with each competitor facing all of the others. Each lasts about one minute, with the first to score a hit winning. If neither fencer scores within one minute, the bout is scored as a double loss. The swimming discipline is a 200 m freestyle race. Competitors are seeded in heats according to their fastest time over the distance. The riding discipline involves show jumping over a 350-450 metre course with between 12 and 15 obstacles. Competitors are paired with horses in a draw 20 minutes before the start of the event. The running discipline involves a 3,000 m cross-country race. Competitors are ranked according to their score from the first four disciplines and given different start times, with the leader going first. The first person to cross the finish line is the overall winner of the pentathlon.

Also:

In addition to the Modern Pentathlon, there has also been an athletics pentathlon event for women in the modern Olympic Games. The first Olympic competition was at the 1964 Summer Olympics in Tokyo. The events of the pentathlon, in order, were: # 80 meter hurdles # Shot put # High jump # Long jump # 200 meters The javelin and the 800 meters were added in the 1984 Summer Olympics to create the women's heptathlon. The hurdles race also became 100 meters.