FREE FIELD CALCULATOR

US survey foot converter

Check legacy survey-foot values against international feet or metres. Convert a distance or a single coordinate value without changing its reference system.

Enter your inputs and calculate.

Small unit difference, large coordinate difference

One million US survey feet equals approximately 1,000,002.000004 international feet. A roughly two-foot numeric difference at that coordinate size is a unit change, not evidence of a datum shift.

Exact definitions

International foot = 0.3048 metre exactly. US survey foot = 1200/3937 metre exactly. Convert by multiplying by metres per source unit and dividing by metres per destination unit.

NIST retired the US survey foot for new applications beginning January 1, 2023, while legacy data still needs its original units interpreted correctly. NIST definitions and retirement guidance.

Confirm the whole reference

Changing units does not convert between county coordinates, State Plane, ground and grid, or vertical datums. This helper does not edit your source file or assign an EPSG code. Review the file's unit definition with its coordinate system, datum and project control before import.

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