Divide by 1000. There are 1000 millimetres in a metre (the prefix "milli-" means "one thousandth").
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To convert mm to meters, divide by 1000. 331.213 mm / 1000 mm/meter = 0.331213 meters
Multiply millimeters (mm) by 0.001 to get meters.
5 meters
To convert meters to mm, you need to multiply by 1000.
To convert from mm to meters, divide by 1000.