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Back Azimuth Calculator
Online back azimuth calculator. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
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back azimuth calculator online
Use back azimuth calculator online for forward bearing deg. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
How to use it
Enter forward bearing deg. Select Calculate and check the labeled output. Copy or download the JSON result.
Options and example settings
Calculation method
back_bearing_deg = mod(forward_bearing_deg+180,360) (^ means exponentiation; trig functions ending in d use degrees).
Worked examples
Apply back azimuth calculator to the case below, keeping the displayed units and assumptions. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
Back Azimuth Calculator — worked case
Settings: No additional options
Input:
45
Calculated result for these inputs:
Output:
{
"back_bearing_deg": 225
}Choose the right tool
Choose great-circle tools for shortest spherical paths and rhumb tools for constant bearings. Spherical models differ from ellipsoidal survey calculations. Web-map tiles have latitude limits and grid bearings require a stated convergence convention.
Limitations and common mistakes
- Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.
- Use the displayed unit in every field. Ratios and percentages are different inputs; percent fields use values such as 25 rather than 0.25.
Frequently asked questions
How can I use back azimuth calculator online?
Enter forward bearing deg. Select Calculate and check the labeled output. Copy or download the JSON result.
Technical references
Where is my input processed?
The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.
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