The opposing systems are imperial and metric, not customary. But, meters are metric.
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Depends on if by 'customary' you're referring to a short ton or a long ton. A short ton is less than a metric ton; a long ton is more than a metric ton.
A formula is neither metric nor customary. Sometimes the same formula will apply for both systems, only the units will change: for example, average speed = distance/time. In other cases the coefficients may change.
1 liter of water has nominally 1 kilogram of mass.1 metric ton = 1,000 kilograms1 cubic meter = 1,000 litersSo 1 cubic meter of water would be 1 metric ton of mass.
About a meter.
millimeter