What is 21 feet to inches? The answer is that 21 feet equals 252 inches.
How to convert 21 feet to inches? We know that one foot is equal to 12 inches, so to convert 21 feet to inches, we must multiply the amount of centimeters by 12, which means that 21 feet is equal to 21 feet × 12 = 252 inches.
See also: How to convert 21 inches in feet.