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Century Converter
Find out which century any year belongs to, and the years it covers.
Which century is it?
Century: —
Covers the years: —
Decade: — · Millennium: —
How to use the Century Converter
- Type the year you want to look up.
- The century, its range of years and the decade appear at once.
- Press Use this year to check the current century.
Features
- Century for any year, AD or BC
- Shows the first and last year of the century
- Decade and millennium for the same year
- Instant results as you type
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Frequently Asked Questions
Common questions about the free online century converter.
1789 falls in the 18th century, which runs from 1701 to 1800, because centuries are counted
from year one.
The 20th century covers 1901 to 2000, so the year 2000 is the last year of the 20th century
and the 21st starts in 2001.
Divide the year by one hundred and round up. For example 1789 divided by 100 is 17.89, which
rounds up to the 18th century.
Type a negative number, such as -44 for 44 BC. The converter then shows the century before
the common era.
No. The calendar goes from 1 BC straight to AD 1, which is why century boundaries start at
years ending in 01.
A millennium is one thousand years, so the 2nd millennium covers the years 1001 to 2000.
It works in your browser without uploading anything. Once the page is open no network
connection is needed for the calculation.
Yes. It is completely free, with no account, no sign-up and no limit on how many years you
convert.
Last updated: October 10, 2026