A kilometer (km) is exactly 1,000 meters. In U.S. customary units, that is about 0.6214 miles, 3,280.84 feet, or 1,093.61 yards. A kilometer measures length or distance; it does not specify how long a trip takes.
NIST lists an international mile as exactly 1,609.344 meters and an international foot as exactly 0.3048 meter. Using those factors, 1,000 ÷ 1,609.344 ≈ 0.621371 miles and 1,000 ÷ 0.3048 ≈ 3,280.84 feet. See NIST unit-conversion factors.
A standard outdoor athletics track is 400 meters around, so 1 kilometer equals 2.5 measured laps (2½ × 400 m = 1,000 m). World Athletics describes the 400-meter event as one lap on a standard outdoor track. Track markings and measured lanes matter; outer lanes travel farther around the bends.
You can also divide the distance into ten 100-meter segments. That is a way to picture the total, not a claim that every straight path or block is 100 meters. For a shorter comparison, half a kilometer is 500 meters; see the 500-meter distance guide.
1.2 kilometers is 1,200 meters, or about 0.7456 miles and 3,937 feet. It is 200 meters longer than one kilometer—the equivalent of half a lap on a 400-meter track.
For a simple comparison, start with the 1-kilometer reference above and add one 200-meter segment. Actual walking routes can be longer than the straight-line distance between two points because of turns, buildings and crossings.