Convert Hectares to Square Millimeters

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

Results in Square Millimeters:
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1 ha = 10,000,000,000 sq mm

How to Convert Hectares to Square Millimeters

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

To convert a hectare measurement to a square millimeter measurement, multiply the area by the conversion ratio. One hectare is equal to 10,000,000,000 square millimeters, so use this simple formula to convert:

square millimeters = hectares × 10,000,000,000

The area in square millimeters is equal to the hectares multiplied by 10,000,000,000.

For example, here's how to convert 5 hectares to square millimeters using the formula above.
5 ha = (5 × 10,000,000,000) = 50,000,000,000 sq mm

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


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 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.

Hectare Measurements and Equivalent Square Millimeter Conversions

Common hectare values converted to the equivalent square millimeter value
Hectares Square Millimeters
1 ha 10,000,000,000 sq mm
2 ha 20,000,000,000 sq mm
3 ha 30,000,000,000 sq mm
4 ha 40,000,000,000 sq mm
5 ha 50,000,000,000 sq mm
6 ha 60,000,000,000 sq mm
7 ha 70,000,000,000 sq mm
8 ha 80,000,000,000 sq mm
9 ha 90,000,000,000 sq mm
10 ha 100,000,000,000 sq mm
11 ha 110,000,000,000 sq mm
12 ha 120,000,000,000 sq mm
13 ha 130,000,000,000 sq mm
14 ha 140,000,000,000 sq mm
15 ha 150,000,000,000 sq mm
16 ha 160,000,000,000 sq mm
17 ha 170,000,000,000 sq mm
18 ha 180,000,000,000 sq mm
19 ha 190,000,000,000 sq mm
20 ha 200,000,000,000 sq mm
21 ha 210,000,000,000 sq mm
22 ha 220,000,000,000 sq mm
23 ha 230,000,000,000 sq mm
24 ha 240,000,000,000 sq mm
25 ha 250,000,000,000 sq mm
26 ha 260,000,000,000 sq mm
27 ha 270,000,000,000 sq mm
28 ha 280,000,000,000 sq mm
29 ha 290,000,000,000 sq mm
30 ha 300,000,000,000 sq mm
31 ha 310,000,000,000 sq mm
32 ha 320,000,000,000 sq mm
33 ha 330,000,000,000 sq mm
34 ha 340,000,000,000 sq mm
35 ha 350,000,000,000 sq mm
36 ha 360,000,000,000 sq mm
37 ha 370,000,000,000 sq mm
38 ha 380,000,000,000 sq mm
39 ha 390,000,000,000 sq mm
40 ha 400,000,000,000 sq mm

More Hectare Area Conversions

US Customary
Convert to Square Miles
1 ha is equal to 0.003861 square miles
Convert to Acres
1 ha is equal to 2.471054 acres
Convert to Square Yards
1 ha is equal to 11,959.9 square yards
Convert to Square Feet
1 ha is equal to 107,639.1 square feet
Convert to Square Inches
1 ha is equal to 15,500,031 square inches
SI Units
Convert to Square Kilometers
1 ha is equal to 0.01 square kilometers
Convert to Square Meters
1 ha is equal to 10,000 square meters
Convert to Square Centimeters
1 ha is equal to 100,000,000 square centimeters
Other Metric Units
Convert to Ares
1 ha is equal to 100 ares