Square metric area unit.
Square Millimeters to Ares Converter — mm2 to a
Convert Square Millimeter (mm2) to Are (a) using the exact conversion factor (1 square millimeter = 1e-8 are). See the formula, worked examples, and conversion table.
Square Millimeters to Ares converter
Converter
Area Converter
Convert land, construction, mapping, survey, and scientific area units.
Context values
Some unit families need one extra value for a physically accurate result.
An are is 100 square meters.
Result = input x 1e-6 / 100.
Area uses the square meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Square Millimeters to Ares
Comparing Square Millimeter and Are is common in agriculture and real estate, where US land is typically measured in acres and most of the rest of the world uses hectares. Specifically: Square metric area unit, and an are is 100 square meters.
Formula
ares = square millimeters × 1e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 square millimeter equals 0.000001 base units, and 1 are equals 100 base units, so dividing one by the other gives the direct square millimeter-to-are factor of 1e-8.
Simple example
1 mm2 × 1e-8 = 1e-8 a
1 square millimeter = 1e-8 ares.
Real-world example
10 mm2 × 1e-8 = 1e-7 a
10 square millimeters = 1e-7 ares.
Conversion table
| Square Millimeter (mm2) | Are (a) |
|---|---|
| 1 mm2 | 1e-8 a |
| 5 mm2 | 5e-8 a |
| 10 mm2 | 1e-7 a |
| 25 mm2 | 2.5e-7 a |
| 50 mm2 | 5e-7 a |
| 100 mm2 | 0.000001 a |
Reverse conversion: Are to Square Millimeter
1e-8 a × 100000000 = 1 mm2
1e-8 ares = 1 square millimeter.
square millimeters = ares × 100000000
For a page dedicated to this direction, see Are to Square Millimeter.
Understanding the Square Millimeter (mm2)
Square metric area unit.
Understanding the Are (a)
An are is 100 square meters.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ares are in 1 square millimeter?
1 square millimeter equals 1e-8 ares, using the exact defined conversion factor rather than an estimate.
How do I convert square millimeter to are?
Multiply the square millimeter value by 1e-8. The converter above does this instantly to whatever precision you set.
How do I convert are back to square millimeter?
Use the reverse factor: 1 are equals 100,000,000 square millimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a square millimeter?
Square Millimeter (mm2) is a unit of area.
What is a are?
Are (a) is a unit of area.
Is the square millimeter to are conversion exact?
Yes. Both square millimeter and are are defined by fixed standards rather than physical artifacts, so the factor of 1e-8 used above is exact to as many digits as you choose to display.