Square kilometers to Acres Converter
Convert Square kilometers (km²) to Acres (ac) instantly, or use the conversion table below to look up common values.
Square kilometers to Acres conversion table
| Square kilometers (km²) | Acres (ac) |
|---|---|
| 1 | 247.105381 |
| 2 | 494.210763 |
| 3 | 741.316144 |
| 4 | 988.421526 |
| 5 | 1,235.526907 |
| 10 | 2,471.053815 |
| 25 | 6,177.634537 |
| 50 | 12,355.269073 |
| 100 | 24,710.538147 |
How to convert Square kilometers to Acres
1 km² equals 247.105381 ac. Use the converter above for any value, or read the table for common conversions.
ac = km² × 247.10538146716533 · km² = ac × 0.0040468564224Multiply a square kilometers figure by 247.105381 to get acres, or divide it by 0.004047 to go the other way.
Worked examples
- 1 km²= 247.105381 ac
- 5 km²= 1,235.526907 ac
- 10 km²= 2,471.053815 ac
- 25 km²= 6,177.634537 ac
- 100 km²= 24,710.538147 ac
What these units are
Square kilometers (km²). 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.
Acres (ac). 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.
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.
Converting Square kilometers to Acres in practice
Working in square kilometers
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.
Reading the result in acres
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.
One acre equals 0.40468564224 hectares exactly, and a square mile holds exactly 640 acres. The site rounds displayed output, so a figure converted to hectares and back may return one digit away.
The classic mistake is treating an acre as a square of fixed side length; it is any shape with that area, and an acre is roughly 209 feet square only when square. Quoting acres from a deed written in hectares also invites error.
Acres and hectares both describe land, with one acre under half a hectare. A plot stated in hectares is about 2.47 times the same number of acres, so quoting the wrong unit makes land look far larger or smaller.
Checking a square kilometers to acres conversion
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 the units on this page.
The total surface area of Tanzania, including Zanzibar
947,303 km² = 234,083,669.17999 ac
Source: UN Statistics Division — World Statistics Pocketbook, country profile: Tanzania · verified 2026-09-14
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