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Unit Conversions
Convert surveying and engineering units quickly, accurately and consistently across common field and office measurements.
Length Conversion
Includes metric, imperial and traditional surveying units.
Exact conversion factors are used for each supported unit.
Area Conversion
Convert land and plan areas including hectares, acres, square metres, feet, chains and links.
Volume Conversion
Useful for earthwork, concrete, water and site quantities.
Angle Conversion
Convert degrees, radians, gons/grads, mils, arcminutes and arcseconds.
Slope & Gradient Conversion
Convert between slope ratio, percentage grade and angle.
A ratio is reported as 1 in n. For downhill/negative slopes, the sign is retained on percentage, rise/run and angle.
Survey Unit Reference
Exact relationships used by this calculator.
Length
| 1 inch | 0.0254 m |
| 1 foot | 0.3048 m |
| 1 yard | 0.9144 m |
| 1 mile | 1609.344 m |
| 1 chain | 20.1168 m |
| 1 link | 0.201168 m |
| 1 rod / pole / perch | 5.0292 m |
| 1 nautical mile | 1852 m |
Area
| 1 hectare | 10,000 m² |
| 1 acre | 4046.8564224 m² |
| 1 square chain | 404.68564224 m² |
| 1 square link | 0.040468564224 m² |
Key surveying relationships
Latitude = D cos θ | Departure = D sin θ
Grade (%) = (Rise ÷ Run) × 100
Gradient ratio = Run ÷ |Rise|
Angle = arctan(Rise ÷ Run)
Latitude = D cos θ | Departure = D sin θ
Grade (%) = (Rise ÷ Run) × 100
Gradient ratio = Run ÷ |Rise|
Angle = arctan(Rise ÷ Run)
Conversions use SI definitions and internationally standardized exact relationships wherever applicable.