Convert Acres to Square Miles
Convert Acres to Square Miles instantly. 1 Acre (ac) equals 0.001563 Square Miles (mi²).
Acres to Square Miles conversion table
| Acres (ac) | Square Miles (mi²) |
|---|---|
| 1 ac | 0.001563 mi² |
| 2 ac | 0.003125 mi² |
| 3 ac | 0.004688 mi² |
| 5 ac | 0.007813 mi² |
| 10 ac | 0.01563 mi² |
| 20 ac | 0.03125 mi² |
| 50 ac | 0.07813 mi² |
| 100 ac | 0.1563 mi² |
| 500 ac | 0.7813 mi² |
| 1,000 ac | 1.5625 mi² |
1 Acre = 0.001563 Square Miles · multiply Acres by 0.001563
About converting Acres to Square Miles
Acres (ac) and Square Miles (mi²) are both units of area, so converting between them is a single multiplication: multiply your Acres figure by 0.001563. Ten Acres comes to 0.01563 Square Miles, and a hundred works out at 0.1563 Square Miles.
Rule of thumb: going from Acres to Square Miles divides, so the figure always shrinks — it takes about 640 Acres to make a single Square Mile. If your answer came out bigger, you have the conversion the wrong way round.
What is an Acre?
The acre is the awkward number in the system, and the reason is that it was never a piece of geometry: it was the area a man with a single ox could plough in a day. That gave it a shape as well as a size — one furlong long by one chain wide, the furlong being the length of the furrow before the team was turned around. Formalised as 4,840 square yards, it never rounded off to anything tidy, and nobody minded, because it described a day’s work. It is still the standard unit for land in the US and for farmland and property in the UK and India.
What is a Square Mile?
A square mile is the area of a square one mile on a side, and in the United States it is the standard way to state the size of anything large: counties, states, metropolitan areas, wildfires and watersheds are all reported in square miles, along with population density in people per square mile. Elsewhere the same figure is given in square kilometers, which is why one lake can carry two very different-looking numbers depending on the source. The unit is literally built into the American landscape — the Public Land Survey System carved much of the country into square-mile sections, which is why the Midwest is a grid of mile-spaced roads.
To put both in perspective: a football pitch is a bit over an acre, while Manhattan is roughly 23 square miles.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Square Miles to Acres converter, or browse all Area converters.
Frequently asked questions
How many Square Miles are in one Acre?
There are 0.001563 Square Miles in one Acre.
How do I convert Acres to Square Miles?
Multiply the number of Acres by 0.001563. For example, 10 Acres = 0.01563 Square Miles.
What is 100 Acres in Square Miles?
100 Acres is equal to 0.1563 Square Miles.
How do I convert Square Miles to Acres?
Multiply the Square Miles value by 640 (or divide by 0.001563).
Is this Acres to Square Miles conversion exact?
The definition is exact — Acres and Square Miles are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is an Acre?
The acre is the awkward number in the system, and the reason is that it was never a piece of geometry: it was the area a man with a single ox could plough in a day. That gave it a shape as well as a size — one furlong long by one chain wide, the furlong being the length of the furrow before the team was turned around. Formalised as 4,840 square yards, it never rounded off to anything tidy, and nobody minded, because it described a day’s work. It is still the standard unit for land in the US and for farmland and property in the UK and India.
What is a Square Mile?
A square mile is the area of a square one mile on a side, and in the United States it is the standard way to state the size of anything large: counties, states, metropolitan areas, wildfires and watersheds are all reported in square miles, along with population density in people per square mile. Elsewhere the same figure is given in square kilometers, which is why one lake can carry two very different-looking numbers depending on the source. The unit is literally built into the American landscape — the Public Land Survey System carved much of the country into square-mile sections, which is why the Midwest is a grid of mile-spaced roads.