Hectares to Square Millimeters Conversion

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
1 ha = 100,000,000 sq cm
1 ha = 10,000 sq m

How to Convert Hectares to Square Millimeters

To convert a hectare measurement to a square millimeter measurement, multiply the area by the conversion ratio.

Since one hectare is equal to 10,000,000,000 square millimeters, you can 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

How Many Square Millimeters Are in a Hectare?

There are 10,000,000,000 square millimeters in a hectare, which is why we use this value in the formula above.

1 ha = 10,000,000,000 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,[1] 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 to Square Millimeter Conversion Table

Hectare measurements converted to square millimeters
Hectares Square Millimeters
0.0000000001 ha 1 sq mm
0.0000000002 ha 2 sq mm
0.0000000003 ha 3 sq mm
0.0000000004 ha 4 sq mm
0.0000000005 ha 5 sq mm
0.0000000006 ha 6 sq mm
0.0000000007 ha 7 sq mm
0.0000000008 ha 8 sq mm
0.0000000009 ha 9 sq mm
0.00000000001 ha 0.1 sq mm
0.0000000001 ha 1 sq mm
0.000000001 ha 10 sq mm
0.00000001 ha 100 sq mm
0.0000001 ha 1,000 sq mm
0.000001 ha 10,000 sq mm
0.00001 ha 100,000 sq mm
0.0001 ha 1,000,000 sq mm
0.001 ha 10,000,000 sq mm
0.01 ha 100,000,000 sq mm
0.1 ha 1,000,000,000 sq mm
1 ha 10,000,000,000 sq mm


  1. Cambridge Dictionary, hectare, https://dictionary.cambridge.org/us/dictionary/english/hectare

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