What is 3'4" in inches? The answer is that 3 feet and 4 inches equal 40 inches.
The conversion formula for feet to inches is in = ft × 12. Based on this conversion formula, to convert 3 feet and 4 inches to inches, you need to multiply 3 feet by 12 to convert to inches, and then add 4 inches to this result.
3'4" = (3' × 12) + 4"
= 36" + 4" = 40 inches