Convert mi to ft miles ↔ feet Free Online Secure
Type a value in miles and read it in feet at once. The factor is exact by definition, the arithmetic happens in your browser, and nothing is sent anywhere.
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Common values — Convert mi to ft (miles ↔ feet)
| mi | ft |
|---|---|
| 1 | 5280 |
| 2 | 10560 |
| 3 | 15840 |
| 5 | 26400 |
| 10 | 52800 |
| 20 | 105600 |
| 50 | 264000 |
| 100 | 528000 |
Where these units come from
The metre was first defined in 1793 as a ten-millionth of the distance from the equator to the North Pole — a definition nobody could check without surveying a quarter of the planet. It has been redefined four times since, each time to something steadier: a platinum bar, then a prototype kept in Paris, then a wavelength of krypton light, and since 1983 the distance light travels in vacuum in 1/299,792,458 of a second. The inch stopped being a separate thing in 1959, when six countries agreed to define it as exactly 25.4 mm. That agreement is why every conversion on this page between a metric and an imperial length is exact rather than measured: both sides now descend from the same definition.
Where you meet them
Millimetres are the working unit of engineering drawings and of anything made in a workshop; centimetres belong to tailoring, furniture and school rulers; metres to rooms, fabric and running tracks. Feet and inches survive in aviation altitudes worldwide, in American and British construction, and in the diagonal of every screen you have ever bought. Nautical miles are not a quaint survival — one is a minute of latitude, which is why ships and aircraft still navigate in them.
Questions people ask
Is a mile the same everywhere?
The statute mile on this page is 1609.344 m exactly, which follows from the 1959 inch. The nautical mile is a different unit altogether, 1852 m exactly, defined as one minute of arc along a meridian. The two are not variants of one another and should never be swapped.
Why are aircraft altitudes given in feet?
Because international aviation standardised on feet decades ago and has never had a reason to change. Flight levels are altitudes in hundreds of feet, so level 350 is 35,000 feet. A foot is exactly 0.3048 metres, so converting is exact; a few countries, such as China and Russia, have used metres instead, which is why pilots must know both.
Is the answer exact?
Where both units are defined in terms of one another by whole numbers, yes — the page says so above the figure, and the only rounding is in how many digits are shown. Where the ratio has no finite decimal, the page shows twelve significant digits and says the relation is approximate rather than pretending otherwise.
Does anything I type leave my device?
No. The arithmetic runs in your browser; nothing is uploaded and there is no server to upload it to. Load the page once and it keeps working with the network switched off.
Five thousand two hundred and eighty steps: how to convert mi to ft
Everyone who has grown up with the American or British system knows that a mile is 5,280 feet, but few can use the number without a pause. The athlete who runs the mile, the pilot who counts the runway in feet and the hiker who reads the length of a trail in miles and its climb in feet all face the same job: they must convert mi to ft. This page does it as you type, giving the answer in full and with thousands separators so that the long figure stays readable.
The conversion is a multiplication by 5,280, exact and simple, but it produces numbers with many digits and invites slips. The sections below set out the rule, worked examples, short portraits of the two units, a comparison, the places where the conversion appears in practice, and a list of mistakes. A little background on why the mile has exactly 5,280 feet helps the number stick in the memory.
How to convert mi to ft: multiply by 5,280
The rule
One mile is exactly 5,280 feet. To convert mi to ft, multiply the number of miles by 5,280. 1 mi is 5,280 ft, 2 mi is 10,560 ft, 5 mi is 26,400 ft, 10 mi is 52,800 ft and 0.5 mi is 2,640 ft. In the other direction, divide the feet by 5,280.
Examples
A 5 mile run is 26,400 ft. A 0.25 mile track lap is 1,320 ft. A bridge 1.7 miles long is 8,976 ft. A mountain pass at 2 miles above sea level is 10,560 ft. A runway of 2.4 miles is 12,672 ft, a length that only the largest airports offer.
Mental shortcut
For a mental convert mi to ft, multiply by 5,000 and add 5.6 per cent. For 3 mi: 15,000 plus 840 is 15,840, exactly right. A second route is to multiply by 5 and by 1,000, then add one twentieth. A third is to break the mile into quarters of 1,320 ft: a quarter mile is 1,320, a half is 2,640, three quarters is 3,960.
Fractions of a mile
A tenth of a mile is 528 ft, a hundredth 52.8 ft. Odometers show tenths, so a reading of 0.3 mi is 1,584 ft.
The mile
Eight furlongs
The statute mile is 1,760 yards, 8 furlongs or 5,280 feet. It comes from the Roman mille passus, a thousand paces, and was fixed in England by an act of 1593 so that it would divide into furlongs of 660 feet, the length of a ploughed furrow.
Today
The mile is the road unit of the United States and the United Kingdom. It is also the unit of the classic race. Its exact value is 1,609.344 m, set in 1959 together with the foot.
The foot
Twelve inches
The foot is 12 inches and exactly 0.3048 m. It began as the length of a person's foot. Three feet make a yard, and 1,760 yards make a mile. It is used for height, building and lumber in the US and for aircraft altitude all over the world.
Why miles and feet go together
The foot is the small unit, the mile the large one, and the relation between them, 5,280, is the product of 8 furlongs, 40 rods and 16.5 feet. The odd number is a historical accident: surveyors kept the furlong and the rod and adjusted the mile.
Mile and foot compared
A mile is 5,280 times a foot. That is a ratio of more than three orders of magnitude. A distance given in feet is thus a very large number when it is of mile length, and a decimal fraction when it is of foot length. That is why roads are measured in miles and building plans in feet.
When you mix the two, as in a climb of 2,000 ft over a 6 mile trail, be careful with the gradient: 2,000 divided by 31,680, or 6.3 per cent. Convert the miles to feet before dividing.
Where you will need it
Running and track
A mile race is 5,280 ft. A standard outdoor track of 400 m is 1,312 ft, so four laps are 5,249 ft, 31 ft short of a mile. Runners who plan paced miles convert the target time to feet per second: a 6 minute mile is 14.7 ft per second.
Runways and airports
Large airports have runways of 10,000 to 13,000 ft, that is 1.9 to 2.5 miles. The longest civilian runway in the world is 18,045 ft, 3.4 mi. A short grass strip may be 1,500 ft, 0.28 mi. Pilots work in feet and nautical miles, so the statute mile figure in a trivia article needs a “convert mi to ft” calculation.
Trails and elevation
Trail guides give length in miles and elevation in feet. A hike of 8.4 mi with 2,400 ft of gain is 44,352 ft long, an average grade of 5.4 per cent. A steep hike has 1,000 ft per mile, a grade of 19 per cent.
Bridges and tunnels
The Golden Gate Bridge is 1.7 mi long, 8,981 ft. The Channel Tunnel is 31.4 mi, 165,800 ft. The Brooklyn Bridge is 0.3 mi, 1,595 ft. Quoted in different units, the same bridge seems long or short.
Trains and tracks
Long freight
American freight trains may be 1.5 to 2 miles long, 7,920 to 10,560 ft. A passenger train of 12 cars is 1,000 ft. A level crossing delayed by a train of 1.5 mi, at 20 mph, lasts 4.5 minutes.
Rail gradients
Railways express gradients as feet per mile or per cent. A grade of 1 per cent is 52.8 ft per mile. A steep mountain line may have 4 per cent, 211 ft per mile. The conversion between miles and feet is the base of the calculation.
Language and symbols
Symbols
The symbol for mile is mi, the symbol for foot ft. In British usage, the abbreviation m is sometimes used for the mile, a source of confusion with metre. Write mi to be clear.
Expressions
"To go the extra mile" has nothing to do with the number of feet. "A miss is as good as a mile" is an old proverb. A "mile-high" city is Denver at 5,280 ft.
Skiing and mountain railways
Vertical and horizontal
A ski run of 2.1 miles with a vertical drop of 1,800 ft has a length of 11,088 ft. The average slope is 1,800 over 11,088, 16 per cent, although the steepest part is much more. Resorts quote both numbers on their maps.
Lifts
A gondola of 1.4 miles, 7,392 ft, climbs 1,500 ft in 12 minutes. The speed is 616 ft per minute, a walking pace of 7 mph.
A worked example: a long hike
Planning the day
A trail is 13.2 mi long with 3,100 ft of ascent and 3,100 ft of descent. To compare the two, run the “convert mi to ft” calculation step on the length: 69,696 ft. The ascent is 4.4 per cent of the horizontal distance. A rule of thumb gives one hour per 2 miles plus one hour per 1,500 ft of ascent, so 6.6 plus 2.1 hours, 8.7 hours.
Safety margin
Add 20 per cent for rests and the short winter daylight: 10.4 hours. If sunrise is at 7:00 and sunset at 17:00, start at first light and expect to finish at dusk.
Final check
Back again
Divide your answer in feet by 5,280. If you return to the original miles, the conversion is correct. If you land near 5 per cent off, you may have used 5,000. If you land a thousand times off, you divided where you meant to multiply.
Notes
Write both figures in your notes, miles and feet, along with the factor. This helps anyone checking your arithmetic.
Cycling climbs and road gradients
Feet per mile
Cyclists describe climbs as feet per mile or per cent. A 10 mile climb that rises 2,640 ft averages 264 ft per mile, a grade of 5 per cent. A famous alpine climb of 12 mi with a gain of 4,500 ft averages 375 ft per mile, 7.1 per cent. Road signs show the per cent; guidebooks list miles and feet. To check a claim, run the “convert mi to ft” calculation step and divide.
Time to climb
A rider who climbs 1,000 ft per hour needs 4.5 hours to gain 4,500 ft. At 5 mph on a 12 mile climb the trip takes 2.4 hours, so a more realistic estimate combines the two numbers.
Drones, kites and balloons
Altitude limits
A hobby drone may fly up to 400 ft in the United States, 0.076 mi. A kite flies at 300 ft, 0.057 mi. A hot-air balloon cruises at 1,000 to 3,000 ft, 0.19 to 0.57 mi. A weather balloon bursts at 100,000 ft, 18.9 mi. These altitudes are quoted in feet, while the distances flown horizontally are in miles.
Line of sight
A drone at 400 ft can see about 24 mi to the horizon in ideal conditions. A control signal usually reaches 2 to 5 mi, 10,560 to 26,400 ft. The long distances are in miles, the altitude in feet.
How far can you see?
The horizon
The distance to the horizon in miles is about 1.22 times the square root of eye height in feet. At 6 ft, 3 mi, or 15,840 ft. From a 100 ft tower, 12.2 mi, 64,400 ft. From an aeroplane at 35,000 ft, 228 mi.
Why feet and miles together
The formula mixes the two units: you enter height in feet and read the distance in miles. A “convert mi to ft” calculation step lets you check how far the horizon is in feet if you want to compare it with the height of a hill.
Mountains and ocean
Very high, very deep
Mount Everest is 29,032 ft above sea level, 5.5 mi. The Mariana Trench is about 36,000 ft deep, 6.8 mi. Airliners cruise at 35,000 ft, 6.6 mi. The mountains and the trench are thus on a similar scale to the altitude of aircraft.
Comparing
Telling a student that Everest is 5.5 miles high is often more vivid than 29,032 feet, because the student has a feel for miles. Teachers use both numbers and point out the factor of 5,280.
Property and surveying
Lots and acres
A square mile is 640 acres. A lot 0.1 mi wide and 0.2 mi deep is 528 by 1,056 ft, 557,568 square feet, or 12.8 acres. Surveyors use feet for lot dimensions and miles for the distance to the highway. Both appear in the same deed.
Right of way
A road easement of 60 ft along a boundary of 2.5 mi, 13,200 ft, covers 792,000 square feet, 18.2 acres. The calculation starts with convert mi to ft for the boundary length.
Cables, pipes and fibre
Long runs
A buried fibre cable of 3 mi is 15,840 ft. A pipeline of 12 mi is 63,360 ft. Contractors price work per foot, so a 12 mile job at 18 dollars per foot costs 1.14 million dollars. The mile figure is for the map, the foot figure for the invoice.
Drums and spools
Cable comes on drums of 5,000 ft. A 3 mile run needs 3.2 drums, so four are ordered. Surplus is kept as spare.
Spreadsheet formulas
Formula
To convert mi to ft for a column, put miles in column A and enter =A2*5280 in column B. Format with thousands separators and no decimals. To reverse, divide by 5280. For running paces, divide the feet by the seconds to get feet per second.
Check values
Enter 1: 5,280. Enter 0.25: 1,320. Enter 1.609344 miles: roughly 8,497 ft. If the first cell shows 5.28, the sheet is dividing by 1000 by mistake.
Rounding
Digits to keep
Miles given to the nearest tenth, such as 3.4 mi, give feet to the nearest 528, which means 17,952 ft is overprecise. Round to 18,000 ft. When the mile figure is exact, for example a quarter mile track, keep the exact feet: 1,320.
Do not round the factor
5,280 is exact. Do not use 5,000 except for rough mental estimates; the error is 5.7 per cent.
Teaching the mile
Walking it
To teach the “convert mi to ft” calculation, have students walk a measured quarter mile and count steps. At 2.5 ft per step, 1,320 ft takes 528 steps. A mile is 2,112 steps. They then calculate their own stride from the step count: 5,280 divided by their steps for a mile.
The multiplication table
Make a table of miles from 0.1 to 10 and feet from 528 to 52,800. Students notice that every row is the previous plus 528, and that every ten rows reach 5,280.
Roman and English history
From a thousand paces
The Roman mile was 1,000 double paces, about 5,000 Roman feet, 1,480 m. English kings tried to change it: the old English mile was 5,000 ft; Queen Elizabeth's act of 1593 set the mile at 8 furlongs of 660 ft, leading to 5,280.
The modern mile
In 1959 the US and the Commonwealth defined the foot as 0.3048 m, which gave a mile of exactly 1,609.344 m. The US survey mile, a slightly longer mile, was retired at the end of 2022.
More values for convert mi to ft
A longer list of conversions
If the value you need is not in the first list, these further conversions may be close enough to read off directly:
- 0.1 mi = 528 ft
- 0.5 mi = 2,640 ft
- 3 mi = 15,840 ft
- 4 mi = 21,120 ft
- 7 mi = 36,960 ft
- 15 mi = 79,200 ft
- 20 mi = 105,600 ft
- 75 mi = 396,000 ft
- 200 mi = 1,056,000 ft
- 500 mi = 2,640,000 ft
- 2,000 mi = 10,560,000 ft
- 10,000 mi = 52,800,000 ft
Mistakes when you convert mi to ft
Dividing instead of multiplying
The foot is the small unit, so the number of feet is larger. If 2 mi becomes 0.00038, you divided.
Using 5,000
It is fine for a quick estimate but the error is almost 6 per cent.
Confusing with nautical miles
A nautical mile is 6,076 ft. Check which mile the source means.
Quick answers
How many feet in a mile?
5,280.
How do I convert mi to ft?
Multiply by 5,280.
What is 2.5 mi in feet?
13,200 ft.
Is the conversion exact?
Yes, exact.
Does my number leave my device?
No. The calculation runs in your browser.
Related pages and a last word
If you work with lengths, these conversions are close at hand: Convert mi to nmi, Convert mi to km, Convert m to ft, Convert yd to ft, Convert ft to in, Convert °C to °F, Convert °F to °C, Convert L to gal, Convert gal to L. The reverse of this page is Convert ft to mi.
In short, to convert mi to ft multiply by 5,280, check with the multiply-by-5,000-and-add-6-per-cent rule, and keep only the digits your measurement supports. Your number stays on your device: nothing is uploaded and no account is needed.