A kilogram(kg) is the base unit of mass in the International System of Units (SI) and it was originally defined as the mass of one liter of water.
While a tonne(t) is a metric unit of mass equal to 1,000 kilograms.
Formula to convert kilograms to tonnes.
Since we already know the relation between a tonne and a kilogram from the definition which is;
1000kg = 1 t
Therefore, when converting kg to t, we divide the kg by 1000.
Mass in t = Mass in kg ÷ 1000
Convert 3500 kg to tonnes.
= 3500 ÷ 1000
= 3.5 tonnes.