Section of Land 640 Acres
| 1 link | 7.92 in. |
| 100 links | 1 chain or 66 ft. |
| 25 links | 1 rod or 16.5 ft. |
| 1 rod, perch, or pole | 16.5 ft. |
| 10 sq. chains | 1 acre |
| 1 mile | 320 rods or 5280 ft. |
| 1 mile | 80 chains or 1760 yds. |
| 43,560 sq. ft. | 1 acre |
| 8 rods wide x 20 rods long | 1 acre |
| 640 acres | 1 section |
| 4 rods | 1 chain |
| 160 sq. rods | 1 acre |
| 1 sq. mile | 1 section |
| 36 sq. mile | 1 township |