| Millennium: | 1st millennium |
|---|---|
| Centuries: | 6th century – 7th century – 8th century |
| Decades: | 610s 620s 630s – 640s – 650s 660s 670s |
| Years: | 644 645 646 – 647 – 648 649 650 |
| 647 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 647 DCXLVII |
| Ab urbe condita | 1400 |
| Armenian calendar | 96 ԹՎ ՂԶ |
| Assyrian calendar | 5397 |
| Bahá'í calendar | -1197–-1196 |
| Bengali calendar | 54 |
| Berber calendar | 1597 |
| English Regnal year | N/A |
| Buddhist calendar | 1191 |
| Burmese calendar | 9 |
| Byzantine calendar | 6155–6156 |
| Chinese calendar | 丙午年十一月二十日 (3283/3343-11-20) — to —
丁未年十一月三十日(3284/3344-11-30) |
| Coptic calendar | 363–364 |
| Ethiopian calendar | 639–640 |
| Hebrew calendar | 4407–4408 |
| Hindu calendars | |
| - Vikram Samvat | 703–704 |
| - Shaka Samvat | 569–570 |
| - Kali Yuga | 3748–3749 |
| Holocene calendar | 10647 |
| Iranian calendar | 25–26 |
| Islamic calendar | 26–27 |
| Japanese calendar | |
| Korean calendar | 2980 |
| Minguo calendar | 1265 before ROC 民前1265年 |
| Thai solar calendar | 1190 |
Year 647 (DCXLVII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 647 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.