Square Millimeters to Hectares Converter

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


Result in Hectares:

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1 sq mm = 1.0E-10 ha
Hint: use a scientific notation calculator to convert E notation to decimal

Do you want to convert hectares to square millimeters?

How to Convert Square Millimeters to Hectares

To convert a measurement in square millimeters to a measurement in hectares, divide the area by the following conversion ratio: 10,000,000,000 square millimeters/hectare.

Since one hectare is equal to 10,000,000,000 square millimeters, you can use this simple formula to convert:

hectares = square millimeters ÷ 10,000,000,000

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

For example, here's how to convert 5,000,000,000 square millimeters to hectares using the formula above.
hectares = (5,000,000,000 sq mm ÷ 10,000,000,000) = 0.5 ha

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

What Is a Square Millimeter?

One square millimeter is equivalent to the area of a square with edges that are each 1 millimeter in length. One square millimeter is equal to 0.00155 square inches or 1/100 of a square centimeter.

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 thousandths, or 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.

Learn more about square millimeters.

What Is a Hectare?

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.

Learn more about hectares.

Square Millimeter to Hectare Conversion Table

Table showing various square millimeter measurements converted to hectares.
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
100 sq mm 0.00000001 ha
1,000 sq mm 0.0000001 ha
10,000 sq mm 0.000001 ha
100,000 sq mm 0.00001 ha
1,000,000 sq mm 0.0001 ha
10,000,000 sq mm 0.001 ha
100,000,000 sq mm 0.01 ha
1,000,000,000 sq mm 0.1 ha
10,000,000,000 sq mm 1 ha


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

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