| Symbol: | re |
| Category: | Length |
| SI Equivalent: | 2.81794×10-15 m |
| Dimension: | L |
| Notes | |
| Fundamental physical constant | |
| Length | ||
| Symbol | Unit Name | |
| 2.81794×10-5 | Å | angstrom |
| 1.88368×10-26 | AU, UA | astronomical unit |
| 2817.94 | am | attometer |
| 2.81794×10-13 | cm | centimeter |
| 9.24521×10-15 | ft | foot |
| 2.81794×10-17 | hm | hectometer |
| 1.10943×10-13 | in | inch |
| 2.81794×10-18 | km | kilometer |
| 2.97863×10-31 | ly | light-year |
| 2.81794×10-15 | m | meter |
| 1.10943×10-7 | µin | microinch |
| 2.81794×10-9 | µm | micron |
| 1.10943×10-10 | mil, thou | mil (thou) |
| 1.75099×10-18 | mi (stat.) | mile (statute, land) |
| 2.81794×10-12 | mm | millimeter |
| 2.81794×10-6 | nm | nanometer |
| 1.52157×10-18 | mi (int. naut.) | nautical mile (international) |
| 9.13232×10-32 | pc | parsec |
| 2.81794×10-3 | pm | picometer |
| 3.08174×10-15 | yd | yard |















