1 metric ton of water is about 1 cubic meter, 1000 liters (depending on temperature).

An Imperial gallon (UK) is defined as 4.54609 liters, so there are 1000/4.54609 ≈ 219.97 Imperial gallons per metric ton of water.

A US liquid gallon is defined as 231 in3. A cubic meter is about 61023.774 cubic inches, or ≈ 264.172 US gallons.

A metric ton is a measure of mass, and a gallon is a measure of volume (unless you're considering certain grain products). The conversion between them requires knowing the density of the material under consideration.

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This similar question was concerned about canola oil. This source gives the density of rapeseed oil as between .9133 and .9168 at 15.5°C. Thus, there could be 289.25 US gallons or 240.85 Imperial gallons of the low-density oil in a metric ton. The difference in density factors makes a difference of a gallon or so.

An Imperial gallon (UK) is defined as 4.54609 liters, so there are 1000/4.54609 ≈ 219.97 Imperial gallons per metric ton of water.

A US liquid gallon is defined as 231 in3. A cubic meter is about 61023.774 cubic inches, or ≈ 264.172 US gallons.

A metric ton is a measure of mass, and a gallon is a measure of volume (unless you're considering certain grain products). The conversion between them requires knowing the density of the material under consideration.

_____

This similar question was concerned about canola oil. This source gives the density of rapeseed oil as between .9133 and .9168 at 15.5°C. Thus, there could be 289.25 US gallons or 240.85 Imperial gallons of the low-density oil in a metric ton. The difference in density factors makes a difference of a gallon or so.