Korean numbers, explained

The units and rules that only exist here — worked out, and written out in English.

• Dates & age
• 100 days99 days later→When is the 100th day?Not 100. Korea counts the starting day as day one, so day 100 is 99 days away.
• Korean age27 in Korean age→If you were born in 2000, how old are you in Korea in 2026?International age is 25–26. Korean age adds one at birth and one every New Year.
• Numbers & size
• Pyeong25.41 pyeong→How big is an 84㎡ apartment?The one Koreans call a 32-pyeong flat. Listings write 84㎡ for the same home.
• Home & appliances
• Electricity₩71,260→What does 350kWh cost in Korea?Tiered pricing — the last kilowatt costs more than twice the first.