An are is 100 m², the metric land unit from which the hectare (100 ares) takes its name. One acre is about 40.47 ares.
How to use the Acre to Are Converter
- Type the number of acres into the Acres field. Decimals such as 0.5 are fine.
- Read the answer in Ares – it updates as you type, with no button to press.
- To convert the other way, type into Ares and the acres are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only acre ⇄ a. Need a different unit? Use the general area converter, where you can choose any “from” and “to” unit.
How it works
Both units measure area, so they are always in the same ratio: one acre equals 40.468564 ares. The calculator multiplies the number of acres you type by 40.468564 to give ares, and when you type into the ares field it divides by the same factor to give acres. Because the ratio never changes, doubling the acres always doubles the ares. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert acres to ares
- Write down the value in acres, for example 1 acre.
- Multiply by the conversion factor 40.468564 (because 1 acre = 40.468564 a).
- 1 × 40.468564 = 40.468564 a.
- To go back from ares to acres, divide by 40.468564 – or multiply by 0.024710538.
acre to a conversion table
| Acres | Ares | Ares | Acres |
|---|---|---|---|
| 0.25 acre | 10.117141 a | 1 a | 0.024710538 acre |
| 0.5 acre | 20.234282 a | 2 a | 0.049421076 acre |
| 1 acre | 40.468564 a | 5 a | 0.12355269 acre |
| 2 acre | 80.937128 a | 10 a | 0.24710538 acre |
| 5 acre | 202.34282 a | 20 a | 0.49421076 acre |
| 10 acre | 404.68564 a | 50 a | 1.2355269 acre |
| 50 acre | 2,023.4282 a | 100 a | 2.4710538 acre |
| 100 acre | 4,046.8564 a | 1,000 a | 24.710538 acre |
What is an acre?
An acre is exactly 43,560 square feet, about 4,047 m². Historically it was the land a team of oxen could plough in a day. It remains the land unit in the U.S. and UK.
What is an are?
An are is 100 m², a square 10 m on each side. It is the base of the hectare (100 ares) and is still used for small plots in parts of Europe and South Asia.
Quick mental conversion
For a fast estimate, multiply acres by about 40 to get ares; the error is about 1.2%. Use the calculator above when you need the exact figure.
Common mistakes to avoid
Converting area with a length factor (1 m = 3.28 ft, but 1 m² = 10.76 ft², not 3.28 ft²), and assuming regional land units such as marla, bigha or katha have one standard size everywhere.
Formula
1 acre = 40.468564 a1 a = 0.024710538 acrea = acre × 40.468564Worked example
Inputs — Acres: 1 acre.
Results — Ares = 40.46856422 a.
Frequently asked questions
How many ares in an acre?
About 40.47 a.
How many ares in a hectare?
100.
How do I convert acres to ares?
Multiply the number of acres by 40.468564. For example, 1 acre × 40.468564 = 40.468564 a.
How do I convert ares back to acres?
Divide by 40.468564 (or multiply by 0.024710538), or simply type the value into the ares field above.
What is 10 acre in ares?
10 acre = 404.68564 a.
What is 100 acre in ares?
100 acre = 4,046.8564 a.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between acres and ares. To pick any area unit, use the general area converter linked under Related calculators.
What formula does the Acre to Are Converter use?
1 acre = 40.468564 a.