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Contour Gradient Estimate

Online contour gradient estimate. Spherical Earth radius 6371.0088 km unless another radius is displayed. Not an ellipsoidal survey or real-time navigation service.

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contour gradient calculator online

Use contour gradient estimate online for contour interval m, interval count, horizontal distance m. 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 contour interval m. Set interval count, horizontal distance m. Select Calculate and check the labeled output. Copy or download the JSON result.

Options and example settings

OptionChoices / valueExample default
contour interval mMain input. Positive values. 20
interval countOption. Whole numbers. 5
horizontal distance mOption. Positive values. 1000

Calculation method

rise_m = contour_interval_m*interval_count; grade_pct = 100*contour_interval_m*interval_count/horizontal_distance_m (^ means exponentiation; trig functions ending in d use degrees).

Worked examples

Apply contour gradient estimate 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.

Contour Gradient Estimate — worked case

Settings: interval count: 5; horizontal distance m: 1000

Input:

20

Calculated result for these inputs:

Output:

{
  "rise_m": 100,
  "grade_pct": 10
}

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 contour gradient calculator online?

Enter contour interval m. Set interval count, horizontal distance m. 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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