Century is one hundred consecutive years. Centuries are numbered ordinally in English and many other languages.
According to the Gregorian calendar, the 1st century AD/CE started on January 1, 1 and ended on December 31, 100. The 2nd century started at year 101, the 3rd at 201, etc. The n-th century started/will start on the year (100×n)-99 and ends in 100×n . A century will only include one year, the centennial year, that starts with the century's number (e.g. 1900 is the final year in the 19th century).List of all Century to other time units individual converters.