How do I convert feet to meters?
One foot is exactly 0.3048 meters, so multiply feet by 0.3048 to get meters.
10 feet is 3.048 meters and 20 feet is 6.096 meters (multiply by 0.3048 each time).
For a rough answer, divide the feet by 3 – 30 feet is about 10 meters. It comes out about 9% high, so it's fine for a room and not for a plank.
What is a foot?
The foot is an imperial and US unit of length equal to 12 inches, or exactly 30.48 centimeters. It is a third of a yard and 1/5,280 of a mile.
The foot began as the length of a human foot, and so differed from place to place and from person to person. The modern international foot was fixed at exactly 0.3048 meters by agreement in 1959.
People's height is given in feet and inches in the US and UK, and aircraft altitude is given in feet nearly everywhere, metric countries included.
What is a meter?
The meter is the SI base unit of length and is equal to 100 centimeters or 1,000 millimeters. It was originally defined as one ten-millionth of the distance from the North Pole to the equator along the meridian through Paris. Since 1983 it has been the distance light travels in a vacuum in 1/299,792,458 of a second.