Do you say tonne or tonnes?

When representing an Imperial Ton with one letter it is customary to use a capital “T” whereas to indicate metric tonnes then a lower case “t” is used. If you are spelling the word Ton or tonne then it can be either capitals or lower case if you spell the whole word.

Does UK Use tonne or ton?

Both “ton” and “tonne” are units of weight, but a “ton” is a British and American measure, while a “tonne” is a metric measure. A “tonne” is equal to 1,000 kg. In the US it may be referred to as a “metric ton”. You should be careful when using the word “ton”, as there are two different types – British and American.