You can convert millimeters to meters squared if you have the measurements of an area in millimeters. Millimeters and meters squared are both units that are used in the metric system of measurement. One thousand millimeters are equivalent to one meter. Because millimeters are a measure of distance, and meters squared are a measure of area, you must have the measurements of the length and width of an area to convert millimeters to meters squared.

- Metric ruler
- Writing utensil (e.g. pencil)
- Paper
- Calculator (optional)

Measure the length of the area in millimeters. For example, say you have a rectangle that is 450 millimeters long. Record this value.

Measure the width of the area in millimeters. For example, say the rectangle is 300 millimeters wide. Record this value.

Multiply the measurements from Step 1 and Step 2 together to find the area, because

In this case, work out:

Record the result.

Divide the result from Step 3 by 1,000,000 because one meter squared is equal to 1,000,000 millimeters squared. Work out

The rectangle is 0.135 meters squared.

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About the Author

Morgan Owens has a Bachelor of Science in criminal justice, and minors in biology and psychology. She attended Boston University and is currently applying to law school for matriculation in 2014. Her articles have been published on numerous informational websites.