Square kilometers Converter
Convert Square kilometers (km²) 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 kilometers convert to
One km² in every other area unit.
| Unit | 1 km² | Reverse |
|---|---|---|
| Square millimeters | 1,000,000,000,000 mm² | 1e-12 km² |
| Square centimeters | 10,000,000,000 cm² | 1e-10 km² |
| Square meters | 1,000,000 m² | 1e-6 km² |
| Hectares | 100 ha | 0.01 km² |
| Acres | 247.105381 ac | 0.004047 km² |
| Square feet | 10,763,910.41671 ft² | 9.2903e-8 km² |
| Square inches | 1,550,003,100.0062 in² | 6.4516e-10 km² |
| Square yards | 1,195,990.046301 yd² | 8.3613e-7 km² |
| Square miles | 0.386102 mi² | 2.589988 km² |
Multiply a square kilometers 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 kilometers conversion reference
Square kilometers to Square millimeters
One square kilometers is 1,000,000,000,000 square millimeters, and one square millimeters is 1e-12 square kilometers.
A square millimeter is one millionth of a square meter. It is used for small cross-sections, circuit boards and material specifications.
- 1 km²= 1,000,000,000,000 mm²
- 5 km²= 5,000,000,000,000 mm²
- 10 km²= 10,000,000,000,000 mm²
Square kilometers to Square centimeters
One square kilometers is 10,000,000,000 square centimeters, and one square centimeters is 1e-10 square kilometers.
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 km²= 10,000,000,000 cm²
- 5 km²= 50,000,000,000 cm²
- 10 km²= 100,000,000,000 cm²
Square kilometers to Square meters
One square kilometers is 1,000,000 square meters, and one square meters is 1e-6 square kilometers.
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 km²= 1,000,000 m²
- 5 km²= 5,000,000 m²
- 10 km²= 10,000,000 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 kilometers to Hectares
One square kilometers is 100 hectares, and one hectares is 0.01 square kilometers.
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 km²= 100 ha
- 5 km²= 500 ha
- 10 km²= 1,000 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 kilometers to Acres
One square kilometers is 247.105381 acres, and one acres is 0.004047 square kilometers.
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 km²= 247.105381 ac
- 5 km²= 1,235.526907 ac
- 10 km²= 2,471.053815 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 kilometers to Square feet
One square kilometers is 10,763,910.41671 square feet, and one square feet is 9.2903e-8 square kilometers.
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 km²= 10,763,910.41671 ft²
- 5 km²= 53,819,552.083549 ft²
- 10 km²= 107,639,104.167097 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 kilometers to Square inches
One square kilometers is 1,550,003,100.0062 square inches, and one square inches is 6.4516e-10 square kilometers.
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 km²= 1,550,003,100.0062 in²
- 5 km²= 7,750,015,500.031 in²
- 10 km²= 15,500,031,000.062 in²
Square kilometers to Square yards
One square kilometers is 1,195,990.046301 square yards, and one square yards is 8.3613e-7 square kilometers.
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 km²= 1,195,990.046301 yd²
- 5 km²= 5,979,950.231505 yd²
- 10 km²= 11,959,900.463011 yd²
Square kilometers to Square miles
One square kilometers is 0.386102 square miles, and one square miles is 2.589988 square kilometers.
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.
- 1 km²= 0.386102 mi²
- 5 km²= 1.930511 mi²
- 10 km²= 3.861022 mi²
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.
What square kilometers are used for
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.
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.
One square kilometer equals exactly 0.386102158542 square miles, from the exact mile definition. Since output is rounded, a large area converted into square miles and back can return with the last digit changed.
The mistake is forgetting that a square kilometer is a million square meters, so a figure in hectares must be divided by one hundred, not multiplied. Square kilometers also describe area, never distance.
Square kilometers are the usual large-area unit; hectares divide each one into a hundred parts and square miles are 2.59 square kilometers each. Using hectares for a district, or square kilometers for a plot, misplaces the scale by a factor of a hundred either way.
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 kilometers.
The total surface area of Tanzania, including Zanzibar
947,303 km²
Source: UN Statistics Division — World Statistics Pocketbook, country profile: Tanzania · verified 2026-09-14
Square kilometers conversion tables
Square kilometers to Square millimeters
| Square kilometers (km²) | Square millimeters (mm²) |
|---|---|
| 1 | 1,000,000,000,000 |
| 2 | 2,000,000,000,000 |
| 3 | 3,000,000,000,000 |
| 4 | 4,000,000,000,000 |
| 5 | 5,000,000,000,000 |
| 10 | 10,000,000,000,000 |
| 25 | 25,000,000,000,000 |
| 50 | 50,000,000,000,000 |
| 100 | 100,000,000,000,000 |
Square kilometers to Square centimeters
| Square kilometers (km²) | Square centimeters (cm²) |
|---|---|
| 1 | 10,000,000,000 |
| 2 | 20,000,000,000 |
| 3 | 30,000,000,000 |
| 4 | 40,000,000,000 |
| 5 | 50,000,000,000 |
| 10 | 100,000,000,000 |
| 25 | 250,000,000,000 |
| 50 | 500,000,000,000 |
| 100 | 1,000,000,000,000 |
Square kilometers to Square meters
| Square kilometers (km²) | Square meters (m²) |
|---|---|
| 1 | 1,000,000 |
| 2 | 2,000,000 |
| 3 | 3,000,000 |
| 4 | 4,000,000 |
| 5 | 5,000,000 |
| 10 | 10,000,000 |
| 25 | 25,000,000 |
| 50 | 50,000,000 |
| 100 | 100,000,000 |