| Centuries: | 6th century · 7th century · 8th century |
| Decades: | 610s 620s 630s 640s 650s 660s 670s |
| Years: | 645 646 647 648 649 650 651 |
| 648 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 648 DCXLVIII |
| Ab urbe condita | 1401 |
| Armenian calendar | 97 ԹՎ ՂԷ |
| Bahá'í calendar | -1196 – -1195 |
| Bengali calendar | 55 |
| Berber calendar | 1598 |
| Buddhist calendar | 1192 |
| Burmese calendar | 10 |
| Byzantine calendar | 6156 – 6157 |
| Chinese calendar | 丁未年十二月初一日 (3284/3344-12-1) — to —
戊申年十二月十二日(3285/3345-12-12) |
| Coptic calendar | 364 – 365 |
| Ethiopian calendar | 640 – 641 |
| Hebrew calendar | 4408 – 4409 |
| Hindu calendars | |
| - Bikram Samwat | 704 – 705 |
| - Shaka Samvat | 570 – 571 |
| - Kali Yuga | 3749 – 3750 |
| Holocene calendar | 10648 |
| Iranian calendar | 26 – 27 |
| Islamic calendar | 27 – 28 |
| Japanese calendar | |
| Korean calendar | 2981 |
| Thai solar calendar | 1191 |