First, we’ll convert 454 mm to inches, using the formula 1 inch = 25.4 mm. From there, we can determine how many feet that is. After that, we use the formula 1 foot = 12 inches to go from inches to feet.
Let’s do the conversion the old-fashioned way:
How many inches is 454 millimeters? 25.4 millimeters per inch = 17.874015748 inches.
17.874015748 inches times 12 inches per foot equals 1.48950131233 feet.
Reducing the number of significant digits to a manageable level:
The equivalent of 454 mm is around 17.87 inches or 1.49 ft.
When converting from millimeters to inches and then inches to feet, 454 millimeters equals around 17.87 inches and 1.49 feet.

First, we’ll convert 454mm to inches by multiplying by 25.4 to get feet and inches. 1 foot equals 12 inches, thus we’ll convert inches to feet again.
Step-by-step conversion:
454mm = 25.4mm/inch = 17.874015748 inches.
17.874015748 inches / 12 inches/foot = 1.48950131233 feet.
Rounding to an acceptable decimal place:
454mm equals 17.87 inches or 1.49 feet.
When translated to inches and feet, 454mm equals 17.87 inches or 1.49 ft.

To write 454 mm as a fraction in inches, we need to find the fraction that is closest to the decimal number. If you round 454mm to the nearest 1/50 inch, it’s about the same as 17 49/50 inches.
So, when written as a fraction, 454mm is about the same as 17 49/50 inches (to the nearest 1/50 inch). This fraction is a close representation of the decimal number in inches, making it a more accurate way to measure.