Feet to miles
One foot is 0.000189393939 miles.
1 foot = 0.000189393939 miles · 1 mile = 5,280 feet
This factor is exact, not rounded. It comes from the definition of the units rather than from a measurement, so the only limit on precision is how many digits are worth showing.
Feet to miles table
| Feet (ft) | Miles (mi) |
|---|---|
| 1 | 0.000189393939 |
| 2 | 0.000378787879 |
| 3 | 0.000568181818 |
| 5 | 0.000946969697 |
| 10 | 0.001893939394 |
| 20 | 0.003787878788 |
| 25 | 0.004734848485 |
| 50 | 0.00946969697 |
| 100 | 0.01893939394 |
| 500 | 0.0946969697 |
| 1,000 | 0.1893939394 |
How the conversion works
Multiply by 0.000189393939 to go from feet to miles, or by 5,280 to go back the other way. Both figures are exact rather than rounded: they follow from the definitions of the units, not from anybody measuring something.
The exactness is more interesting than it sounds. Since the International Yard and Pound Agreement of 1959, the inch has been defined as exactly 25.4 millimetres and the pound as exactly 0.45359237 kilograms. Every other imperial length and weight follows from those two by whole-number ratios, which means the imperial system is now defined in terms of the metric one rather than alongside it.
A mile is 5,280 feet, a number that looks arbitrary and is: it comes from the Roman mille passuum of a thousand paces, later reconciled with the furlong so that eight furlongs made a mile.