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How many million cubic metre in 1 gallons?
The answer is 3.7854118E-9.

We assume you are converting between **million cubic metre** and **gallon [US, liquid]**.

You can view more details on each measurement unit:

million cubic metre or
gallons

The SI derived unit for **volume** is the cubic meter.

1 cubic meter is equal to 1.0E-6 million cubic metre, or 264.17205124156 gallons.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between million cubic meters and gallons.

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You can do the reverse unit conversion from gallons to million cubic metre, or enter any two units below:

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