Survey Unit Consistency Checker
Checks and converts between survey units like metres, millimetres, hectares, degrees, gon and radians.
Value
Confirm a calculation keeps to one unit family. Runs in your browser; nothing is stored.
Equivalents
- mm1500
- cm150
- m1.5
- km0.0015
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Pick the quantity type — length, area or angle.
- Enter your value and choose its unit.
- Read it in every related unit (angles also show DMS) to confirm your calculation is consistent.
How it works
Mixing units (metres with millimetres, square metres with hectares, degrees with gons) is a common source of survey errors.
This shows your value across the whole unit family at once, so you can confirm every figure in a worked calculation is in the same units before you combine them.
Worked example
200 gon. Choosing Angle and 200 gon shows 180° (and 3.14159 rad, and the DMS form) — a quick way to confirm a gon-based instrument value in degrees.
Frequently asked questions
What is a gon?
A gon (or grad) divides a circle into 400 parts, so a right angle is 100 gon and a full circle 400 gon. Some European instruments and software use it instead of degrees.
Is this official course material?
No. It is free study support mapped to surveying course levels — not official North Metropolitan TAFE content or advice. Always follow your lecturer and the official assessment brief, and check your own working.
Related tools
- Rounding and Significant Figures Checker
- DMS to Decimal Degrees Converter
- Survey Formula Sheet Builder
- Bearing Conversion Practice Generator
- Grid Reference Practice Tool
- Map Bearing Romer Tool
Explore more in Surveying, Coordinates, GIS & CAD.
Cite this tool
Zerdly. (2026). Survey Unit Consistency Checker. Retrieved from https://www.zerdly.com/tools/survey-unit-consistency-checker/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.