640 BC

Millennium: 1st millennium BC
Centuries:
Decades:
Years:
640 BC in various calendars
Gregorian calendar640 BC
DCXL BC
Ab urbe condita114
Ancient Egypt eraXXVI dynasty, 25
- PharaohPsamtik I, 25
Ancient Greek era35th Olympiad (victor
Assyrian calendar4111
Balinese saka calendarN/A
Bengali calendar−1232
Berber calendar311
Buddhist calendar−95
Burmese calendar−1277
Byzantine calendar4869–4870
Chinese calendar庚辰年 (Metal Dragon)
2058 or 1851
    — to —
辛巳年 (Metal Snake)
2059 or 1852
Coptic calendar−923 – −922
Discordian calendar527
Ethiopian calendar−647 – −646
Hebrew calendar3121–3122
Hindu calendars
 - Vikram Samvat−583 – −582
 - Shaka SamvatN/A
 - Kali Yuga2461–2462
Holocene calendar9361
Iranian calendar1261 BP – 1260 BP
Islamic calendar1300 BH – 1299 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1694
Minguo calendar2551 before ROC
民前2551年
Nanakshahi calendar−2107
Thai solar calendar−97 – −96
Tibetan calendar阳金龙年
(male Iron-Dragon)
−513 or −894 or −1666
    — to —
阴金蛇年
(female Iron-Snake)
−512 or −893 or −1665

The year 640 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 114 Ab urbe condita . The denomination 640 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.