To convert feet to inches (ft to in), multiply by 12. 1 foot equals 12 in, about 44% of a tennis racket.
| feet | inches |
|---|---|
| 1 foot | 12 in |
| 2 feet | 24 in |
| 5 feet | 60 in |
| 10 feet | 120 in |
| 25 feet | 300 in |
| 50 feet | 600 in |
| 100 feet | 1,200 in |
| 250 feet | 3,000 in |
| 500 feet | 6,000 in |
| 1000 feet | 12,000 in |
Definition: 12 inches, or exactly 0.3048 meters.
History: The foot traces back to the Roman "pes," and different versions of it were used across Greek, Roman, English, Chinese, and French systems, each a slightly different length depending on who was measuring. English legend credits King Henry I with standardizing it in the 12th century using his own foot as the template - likely a booted foot, since people (and their footwear) tended to run smaller back then. It took until 1959 for the US, UK, and four other countries to finally agree on one exact, shared definition.
Current use: Building and construction measurements, room dimensions, and aircraft altitude are still commonly given in feet, even in countries that otherwise use metric.
Definition: 1/12 of a foot, or exactly 25.4 millimeters.
History: The Romans had the "uncia" - one-twelfth of their foot, the same root word that gives us "ounce" today. Centuries later, medieval England needed something more practical and checkable than "one twelfth of a foot," so a 1308 statute under King Edward I defined an inch as the length of three grains of barley, dry and round, laid end to end - a definition ordinary people could actually verify for themselves without a ruler.
Current use: Screen sizes, paper formats, pipe diameters, and everyday measurements across the US, UK, and other imperial-leaning countries.