ODDFPRICE stands for "Odd First Period Price". It calculates the price of a bond when the first period of the bond is shorter or longer than a regular period. In simple words: If a bond doesn’t start on a perfect schedule (like exactly every 6 months or 1 year), ODDFPRICE helps you figure out what it’s really worth today. ✅ Regular bonds ➔ Use PRICE ✅ Bonds with "weird" first periods ➔ Use ODDFPRICE Real-world bonds don't always fit neatly into textbook schedules!