Calculate your LPM by measuring the amount of flow in liters that occurs over the course of exactly one minute.
Multiply your LPM by .001, or divide your LPM by 1,000. The product of this calculation is your M3 as measured in meters per minute.
Select another kind of M3 you wish to convert your LPM to. You may want to convert LPM to M3/second or M3/hour. For the former, multiply your LPM by 0.0000167 to get a per-second measurement. For the latter, multiply LPM by .06 to calculate a per-hour measurement.