| Femtometer | Perch |
| 1 fermi | 1.9883878151595E-16 perch |
| 2 fermi | 3.9767756303189E-16 perch |
| 3 fermi | 5.9651634454784E-16 perch |
| 4 fermi | 7.9535512606379E-16 perch |
| 5 fermi | 9.9419390757973E-16 perch |
| 6 fermi | 1.1930326890957E-15 perch |
| 7 fermi | 1.3918714706116E-15 perch |
| 8 fermi | 1.5907102521276E-15 perch |
| 9 fermi | 1.7895490336435E-15 perch |
| 10 fermi | 1.9883878151595E-15 perch |
| 11 fermi | 2.1872265966754E-15 perch |
| 12 fermi | 2.3860653781914E-15 perch |
| 13 fermi | 2.5849041597073E-15 perch |
| 14 fermi | 2.7837429412233E-15 perch |
| 15 fermi | 2.9825817227392E-15 perch |
| 16 fermi | 3.1814205042551E-15 perch |
| 17 fermi | 3.3802592857711E-15 perch |
| 18 fermi | 3.579098067287E-15 perch |
| 19 fermi | 3.777936848803E-15 perch |
| 20 fermi | 3.9767756303189E-15 perch |