Conversion Factors
U.S. customary units to International System of Units
| Multiply | By | To obtain |
|---|
| Length |
| foot (ft) | 0.3048 | meter (m) |
| mile (mi) | 1.609 | kilometer (km) |
| Area |
| acre | 4,047 | square meter (m2) |
| acre | 0.4047 | hectare (ha) |
| acre | 0.4047 | square hectometer (hm2) |
| acre | 0.004047 | square kilometer (km2) |
| square foot (ft2) | 929.0 | square centimeter (cm2) |
| square foot (ft2) | 0.09290 | square meter (m2) |
| square mile (mi2) | 259.0 | hectare (ha) |
| square mile (mi2) | 2.590 | square kilometer (km2) |
| Volume |
| acre-foot (acre-ft) | 1,233 | cubic meter (m3) |
| acre-foot (acre-ft) | 0.001233 | cubic hectometer (hm3) |
| Flow rate |
| foot per second (ft/s) | 0.3048 | meter per second (m/s) |
| cubic foot per second (ft3/s) | 0.02832 | cubic meter per second (m3/s) |
International System of Units to U.S. customary units
| Multiply | By | To obtain |
|---|
| Length |
| kilometer (km) | 0.6214 | mile (mi) |
| kilometer (km) | 0.5400 | mile, nautical (nmi) |
| Area |
| square meter (m2) | 0.0002471 | acre |
| Volume |
| cubic meter (m3) | 35.31 | cubic foot (ft3) |
| cubic meter (m3) | 0.0008107 | acre-foot (acre-ft) |
Abbreviations
| ERF1_2 | U.S. Geological Survey Enhanced River Reach File |
| NHD | National Hydrography Dataset |
| NID | National Inventory of Dams |
| NIDID | National Inventory of Dams Identification Number |
| RMD | Reservoir Morphology Database |
| SPARROW | SPAtially Referenced Regressions on Watershed attributes model |
| USGS | U.S. Geological Survey |
|
First posted September 13, 2017
|
U.S. Department of the Interior |
U.S. Geological Survey