Units of Measurement
| Distance |
| Digitus |
Finger |
1/16 foot |
1,848 cm |
| Unica |
Inch |
1/12 foot |
2,464 cm |
| Palmus |
Hand |
1/4 foot |
7,392 cm |
| Semis |
|
1/2 foot |
14,785 |
| Pes |
(Roman) Foot |
1 foot |
29,57 cm |
| Palmines |
Palm-foot |
1 1/4 feet |
36,96 cm |
| Cubitus |
Cubit |
1 1/2 feet |
44,36 cm |
| Gradus |
Pace |
2 1/2 feet |
73,93 cm |
| Passus |
Double pace |
5 feet |
1,478 m |
| Actus |
Furrow |
120 feet |
35,48 m |
| Mille passus |
(Roman) mile |
5000 feet |
1478,5 m |
| Distance between manholes (putei) |
| Vitruvius 8.4.3 |
1 actus (120 Rf) |
35,48 m |
| Plinius NH 31.31 |
2 actus (240 Rf) |
70,96 m |
| Burdy Gier aqueduct |
|
72 - 77 m |
| Gradient |
| Vitruvius 8.6.1 |
1/2 foot to 100 feet |
0,5% (5 promille) |
| Plinius NH 31.57 |
1/4 unica to 100 feet |
0,02 % (0,2 promille) |
| Mean |
|
0,15 - 0,30% |