Square miles Converter
Convert Square miles (mi²) to any other area unit. The table below gives the exact figure for each unit, and every conversion is worked from the same engine as the converter.
What square miles convert to
One mi² in every other area unit.
| Unit | 1 mi² | Reverse |
|---|---|---|
| Square millimeters | 2,589,988,110,336 mm² | 3.861e-13 mi² |
| Square centimeters | 25,899,881,103.36 cm² | 3.861e-11 mi² |
| Square meters | 2,589,988.110336 m² | 3.861e-7 mi² |
| Square kilometers | 2.589988 km² | 0.386102 mi² |
| Hectares | 258.998811 ha | 0.003861 mi² |
| Acres | 640 ac | 0.001563 mi² |
| Square feet | 27,878,400 ft² | 3.587e-8 mi² |
| Square inches | 4,014,489,600.000001 in² | 2.491e-10 mi² |
| Square yards | 3,097,600 yd² | 3.2283e-7 mi² |
Multiply a square miles figure by the figure in the second column to get the unit in the first, or multiply by the third column to go the other way.
Square miles conversion reference
Square miles to Square millimeters
One square miles is 2,589,988,110,336 square millimeters, and one square millimeters is 3.861e-13 square miles.
A square millimeter is one millionth of a square meter. It is used for small cross-sections, circuit boards and material specifications.
- 1 mi²= 2,589,988,110,336 mm²
- 5 mi²= 12,949,940,551,680.002 mm²
- 10 mi²= 25,899,881,103,360.004 mm²
Square miles to Square centimeters
One square miles is 25,899,881,103.36 square centimeters, and one square centimeters is 3.861e-11 square miles.
A square centimeter is one ten-thousandth of a square meter. It is used for small surfaces such as fabric swatches, skin areas and craft work.
- 1 mi²= 25,899,881,103.36 cm²
- 5 mi²= 129,499,405,516.8 cm²
- 10 mi²= 258,998,811,033.6 cm²
Square miles to Square meters
One square miles is 2,589,988.110336 square meters, and one square meters is 3.861e-7 square miles.
The square meter is the SI unit of area. It is used for floor space, land plots and material quantities such as tiles or paint coverage; a parking bay is about 12 square meters.
- 1 mi²= 2,589,988.110336 m²
- 5 mi²= 12,949,940.55168 m²
- 10 mi²= 25,899,881.10336 m²
The square meter is the International System unit of area, the area of a square with one-meter sides. It is the base for all metric area measures.
Apartment and office floor areas, building permits, land in urban plots, solar panel output per unit and fabric are measured in square meters in metric countries. Tiling and flooring quantities follow the same unit.
Square miles to Square kilometers
One square miles is 2.589988 square kilometers, and one square kilometers is 0.386102 square miles.
A square kilometer is one million square meters. It is used for districts, national parks and country areas — and one square kilometer is exactly 100 hectares.
- 1 mi²= 2.589988 km²
- 5 mi²= 12.949941 km²
- 10 mi²= 25.899881 km²
A square kilometer is the area of a square one kilometer on each side, exactly 1,000,000 square meters or 100 hectares. It is the usual metric unit for large areas.
City and district areas, national parks, reservoirs, islands and administrative regions are measured in square kilometers. Satellite imagery and land-cover studies report extents this way as well.
Square miles to Hectares
One square miles is 258.998811 hectares, and one hectares is 0.003861 square miles.
A hectare is 10,000 square meters, or 0.01 square kilometers. It is the standard unit for farmland and land-title areas in Tanzania and most metric countries.
- 1 mi²= 258.998811 ha
- 5 mi²= 1,294.994055 ha
- 10 mi²= 2,589.98811 ha
A hectare is exactly 10,000 square meters, the area of a square 100 meters on a side, and it equals 0.01 square kilometers. It is the metric unit of land area.
Farmland, forest, parks and large plots are measured in hectares across most of the world, and land registries in metric countries record titles in hectares. Sports fields and golf courses also appear in hectares.
Square miles to Acres
One square miles is 640 acres, and one acres is 0.001563 square miles.
An acre is 4,046.8564224 square meters, about 0.4047 hectares. It is the traditional land unit of the UK and US and is still used for land in parts of East Africa.
- 1 mi²= 640 ac
- 5 mi²= 3,200 ac
- 10 mi²= 6,400 ac
An acre is exactly 4,046.8564224 square meters, an area of 4,840 square yards, or one chain by one furlong. It is a unit of area, not of length.
Land titles, farm sizes, plots and ranches are described in acres in the United States, the United Kingdom and parts of the Commonwealth. Estate agents quote plot sizes in acres.
Square miles to Square feet
One square miles is 27,878,400 square feet, and one square feet is 3.587e-8 square miles.
A square foot is 0.09290304 square meters. It is the standard unit for floor area and property listings in the United States and the UK.
- 1 mi²= 27,878,400 ft²
- 5 mi²= 139,392,000 ft²
- 10 mi²= 278,784,000 ft²
A square foot is the area of a square with sides one foot long, exactly 0.09290304 square meters. It is a unit of area and not a unit of length.
Floor area in property listings, apartment sizes, tiles, paint coverage and roofing are quoted in square feet in the United States and several other markets. Carpets and timber are sold this way too.
Square miles to Square inches
One square miles is 4,014,489,600.000001 square inches, and one square inches is 2.491e-10 square miles.
A square inch is 6.4516 square centimeters. It is used for small areas, and is the denominator in psi, the imperial pressure unit.
- 1 mi²= 4,014,489,600.000001 in²
- 5 mi²= 20,072,448,000 in²
- 10 mi²= 40,144,896,000 in²
Square miles to Square yards
One square miles is 3,097,600 square yards, and one square yards is 3.2283e-7 square miles.
A square yard is 0.83612736 square meters, or 9 square feet. It is used for carpet, landscaping and fabric in imperial-measure countries.
- 1 mi²= 3,097,600 yd²
- 5 mi²= 15,488,000 yd²
- 10 mi²= 30,976,000 yd²
What square miles are used for
A square mile is about 2.59 square kilometers, or exactly 640 acres. It is used for land and territory areas in the United States and the UK, and for large ranch or park sizes.
A square mile is the area of a square one mile on each side, exactly 2.589988110336 square kilometers, or exactly 640 acres. It is built from the statute mile and never from the nautical mile.
Metropolitan areas, counties, states, large ranches and national parks are measured in square miles in those countries. Weather maps and watershed studies also report extents in square miles.
The relation to acres is exact, with 640 acres in one square mile, and the relation to square kilometers follows from the exact definition of the mile. Rounded display can perturb the last digit of a two-way conversion.
Treating square miles as if they were mile figures is the usual slip: an area scales with the square of the length, so a square mile is not 1.609 square kilometers. Land is often better compared in acres or hectares.
Square miles, acres and square kilometers all describe large areas, and the relations are exact: 640 acres to a square mile, 2.59 square kilometers to the same measure. A county in one unit and a park in another do not compare until both are converted.
Every factor is an exact definition, so the only loss is display rounding. Land figures quoted in acres and hectares are usually rounded at the source.
Area factors are the square of the corresponding length factors, so the numbers move much faster than a reader expects. A square meter contains 10,000 square centimeters, and a square kilometer a million square meters, not a thousand.
The units that share a name across systems are still different sizes: a square mile and a square kilometer differ by a factor of about 2.59, and an acre is a fixed area rather than a square with equal sides, so it does not convert like the length units it is named after.
Land is where the reciprocal matters most, because acres and hectares are both in use for the same plots. When a figure moves between them, check it against a shape you can picture — a hectare is a square 100 meters on each side — rather than against the number alone.
Tanzania reference points
Real quantities, converted into square miles.
The total surface area of Tanzania, including Zanzibar
947,303 km² = 365,755.733094 mi²
Source: UN Statistics Division — World Statistics Pocketbook, country profile: Tanzania · verified 2026-09-14
Square miles conversion tables
Square miles to Square millimeters
| Square miles (mi²) | Square millimeters (mm²) |
|---|---|
| 1 | 2,589,988,110,336 |
| 2 | 5,179,976,220,672 |
| 3 | 7,769,964,331,008.001 |
| 4 | 10,359,952,441,344 |
| 5 | 12,949,940,551,680.002 |
| 10 | 25,899,881,103,360.004 |
| 25 | 64,749,702,758,400 |
| 50 | 129,499,405,516,800 |
| 100 | 258,998,811,033,600 |
Square miles to Square centimeters
| Square miles (mi²) | Square centimeters (cm²) |
|---|---|
| 1 | 25,899,881,103.36 |
| 2 | 51,799,762,206.72 |
| 3 | 77,699,643,310.08 |
| 4 | 103,599,524,413.44 |
| 5 | 129,499,405,516.8 |
| 10 | 258,998,811,033.6 |
| 25 | 647,497,027,584 |
| 50 | 1,294,994,055,168 |
| 100 | 2,589,988,110,336 |
Square miles to Square meters
| Square miles (mi²) | Square meters (m²) |
|---|---|
| 1 | 2,589,988.110336 |
| 2 | 5,179,976.220672 |
| 3 | 7,769,964.331008 |
| 4 | 10,359,952.441344 |
| 5 | 12,949,940.55168 |
| 10 | 25,899,881.10336 |
| 25 | 64,749,702.7584 |
| 50 | 129,499,405.5168 |
| 100 | 258,998,811.0336 |