In 1 square miles there are 2,589,988.110336 centiares. Meanwhile in 1 centiares there are 3.86102e-7 square miles. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Centiares to Square miles calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert square miles (mi²) to centiares (ca), convert to square meters (m²) first, then switch to centiares.
Key fact: 1 centiare (ca) = 1 square meter (m²)
This means m² and ca are the same size.
Square miles to square meters:
1 mi² = 2,589,988.110336 m²
Square miles to centiares:
Since 1 m² = 1 ca, then:
1 mi² = 2,589,988.110336 ca
Conversion formula (mi² to ca):
Quick example:
A centiare (ca) is a metric unit of area. It equals 1 square meter (1 m²). Since it’s small, it works well for describing plots, gardens, and small land areas.
A square mile (sq mi) is a U.S. and imperial unit of area. It equals the area of a square that is 1 mile on each side. It’s common for large land areas like counties, cities, and regions.
1 square mile equals 2,589,988.110336 centiares.
That’s because 1 square mile equals 2,589,988.110336 square meters, and 1 centiare equals 1 square meter.
Use this formula:
centiares = square miles × 2,589,988.110336
This converts square miles (sq mi) into centiares (ca) using exact metric definitions.
Use the reverse formula:
square miles = centiares ÷ 2,589,988.110336
This is useful when you start with square meters or centiares and need square miles.
A square mile covers a huge area. A centiare is only 1 square meter, so it takes millions of centiares to match 1 square mile. The units measure very different scales.
Yes. 1 centiare = 1 square meter.
The name comes from the are system, where 1 are equals 100 square meters.
1 square mile equals 2,589,988.110336 square meters (m²).
Since centiares match square meters, this is also the centiare total.
1 square mile equals 258.9988110336 hectares (ha).
Since 1 hectare equals 10,000 centiares, you can also find centiares by:
centiares = hectares × 10,000
For a rough estimate, use:
centiares ≈ square miles × 2.59 million
This gives a close result for everyday use, but it won’t match exact precision.
Here are a few reference points:
No. The conversion is fixed by definition. A square mile and a centiare have the same values anywhere. Only how people use the units changes by region.
It depends on your need:
The Calculate Box tool to convert square miles to centiares uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a square miles value in the box and have it instantly converted to centiares.