Convert Square Millimeters to Hectares

Enter the area in square millimeters below to get the value converted to hectares.

Results in Hectares:
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1 sq mm = 1.0E-10 ha

How to Convert Square Millimeters to Hectares

Calculators can be used to convert measurements from one unit to another

To convert a square millimeter measurement to a hectare measurement, multiply the area by the conversion ratio. One square millimeter is equal to 1.0E-10 hectares, so use this simple formula to convert:

hectares = square millimeters × 1.0E-10

The area in hectares is equal to the square millimeters multiplied by 1.0E-10.

For example, here's how to convert 5 square millimeters to hectares using the formula above.
5 sq mm = (5 × 1.0E-10) = 5.0E-10 ha

Square millimeters and hectares are both units used to measure area. Keep reading to learn more about each unit of measure.

Square Millimeters

One square millimeter is equal to the area of a square with edges that are 1 millimeter in length.

The square millimeter, or square millimetre, is a multiple of the square meter, which is the SI derived unit for area. In the metric system, "milli" is the prefix for 10-3. A square millimeter is sometimes also referred to as a square mm. Square millimeters can be abbreviated as sq mm, and are also sometimes abbreviated as mm². For example, 1 square millimeter can be written as 1 sq mm or 1 mm².


One hectare is equal to 10,000 square meters, or the area of a square with 100 meter sides.

The hectare is an SI accepted unit for area for use with the metric system. In the metric system, "hecto" is the prefix for 102. Hectares can be abbreviated as ha, for example 1 hectare can be written as 1 ha.

Square Millimeter Measurements and Equivalent Hectare Conversions

Common square millimeter values converted to the equivalent hectare value
Square Millimeters Hectares
1 sq mm 0.0000000001 ha
2 sq mm 0.0000000002 ha
3 sq mm 0.0000000003 ha
4 sq mm 0.0000000004 ha
5 sq mm 0.0000000005 ha
6 sq mm 0.0000000006 ha
7 sq mm 0.0000000007 ha
8 sq mm 0.0000000008 ha
9 sq mm 0.0000000009 ha
10 sq mm 0.000000001 ha
11 sq mm 0.0000000011 ha
12 sq mm 0.0000000012 ha
13 sq mm 0.0000000013 ha
14 sq mm 0.0000000014 ha
15 sq mm 0.0000000015 ha
16 sq mm 0.0000000016 ha
17 sq mm 0.0000000017 ha
18 sq mm 0.0000000018 ha
19 sq mm 0.0000000019 ha
20 sq mm 0.000000002 ha
21 sq mm 0.0000000021 ha
22 sq mm 0.0000000022 ha
23 sq mm 0.0000000023 ha
24 sq mm 0.0000000024 ha
25 sq mm 0.0000000025 ha
26 sq mm 0.0000000026 ha
27 sq mm 0.0000000027 ha
28 sq mm 0.0000000028 ha
29 sq mm 0.0000000029 ha
30 sq mm 0.000000003 ha
31 sq mm 0.0000000031 ha
32 sq mm 0.0000000032 ha
33 sq mm 0.0000000033 ha
34 sq mm 0.0000000034 ha
35 sq mm 0.0000000035 ha
36 sq mm 0.0000000036 ha
37 sq mm 0.0000000037 ha
38 sq mm 0.0000000038 ha
39 sq mm 0.0000000039 ha
40 sq mm 0.000000004 ha

More Square Millimeter Area Conversions

US Customary
Convert to Square Miles
1 sq mm is equal to 3.861E-13 square miles
Convert to Acres
1 sq mm is equal to 2.4711E-10 acres
Convert to Square Yards
1 sq mm is equal to 1.196E-6 square yards
Convert to Square Feet
1 sq mm is equal to 1.0764E-5 square feet
Convert to Square Inches
1 sq mm is equal to 0.00155 square inches
SI Units
Convert to Square Kilometers
1 sq mm is equal to 1.0E-12 square kilometers
Convert to Square Meters
1 sq mm is equal to 1.0E-6 square meters
Convert to Square Centimeters
1 sq mm is equal to 0.01 square centimeters
Other Metric Units
Convert to Ares
1 sq mm is equal to 1.0E-8 ares