Only if... (a) you know the weight of a measured amount of tarmac - and (b) you know what depth the tarmac is. If you can calculate the volume of tarmac, and you know the weight of a specific amount - you can convert to tonnes.
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Metre is already a metric unit. If you mean metric tonnes to metres divide by a million, i.e. 1,000,000
Tonnes divided by 1,000 = kg
1 tonne = 1,000,000 grams
To convert from kilograms to tonnes, divide by 1000.
Without more information you cannot.