Calculate Bearing, Distance, and Grade Between Coordinates Instantly

Whether you are staking out a boundary, checking the fall on a newly laid stormwater pipe, or verifying a structural grid, calculating the inverse between two points is the most fundamental task in Coordinate Geometry (COGO).

But firing up heavy CAD software or punching Eastings and Northings into a hand calculator while standing in the dirt isn’t exactly efficient. That is exactly why the Bearing & Distance (Inverse) Calculator at sitemath.net was built. It is a lightweight, browser-based COGO engine designed to instantly calculate horizontal distances, slope distances, true bearings, and grades between any two coordinates.

Sample Data

More Than Just an Inverse Calculator

Most online distance calculators stop at basic 2D geometry. Our tool is engineered for real-world site applications, processing true 3D spatial data to give you actionable engineering metrics.

Here is exactly what the engine calculates the second you select your points:

• Bearing and Horizontal Distance (HD): Instantly find the precise 2D vector between your coordinates, outputting the bearing in both Decimal Degrees and traditional Degrees, Minutes, Seconds (DMS).
• 3D Slope Distance (SD) & Elevation Deltas: If you input elevation (Z) values, the tool calculates the true 3D spatial distance and the exact elevation difference ( \Delta R ) between the points.
• Grade Inquiry & Pitch: Need to check a pipe fall or a concrete crossfall? The calculator automatically converts your vertical delta and horizontal distance into a Grade Percentage (%) and a Pitch Ratio (1:N).
• Zenith Angle: Perfect for surveyors verifying vertical circle observations from a total station setup.

Two Frictionless Ways to Input Data

We know that data comes in different formats depending on the task. The calculator features two distinct input modes so you never have to retype numbers manually if you don’t want to:

1. On-the-Fly Manual Entry

If you just need to run a quick check between two control stations or design points, simply type the Easting (X), Northing (Y), and Elevation (Z) into the Point A and Point B fields. The tool handles the rest.

2. Bulk Point List Selection

If you are analyzing an entire site or a long traverse, manual entry is a waste of time. Switch to the Pick from Point List mode and paste your entire raw CSV file (Point ID, X, Y, Z) directly into the text box. The calculator will instantly populate two dropdown menus with your specific point names and coordinates. Just pick your “From” point, pick your “To” point, and the inverse is solved instantly.

Generate Fast QA/QC Deliverables

Numbers on a screen are great for quick field checks, but project managers and site engineers need hard records for their QA/QC files.

Every calculation you run can be logged into the tool’s batch memory using the Save Result button. Once you have checked all your pipe inverts, holding-down bolts, or control traverses, click Export All. The calculator will immediately generate a clean, horizontally formatted CSV report detailing every single Bearing, Slope Distance, Delta XYZ, and Grade. It drops straight into Excel, completely eliminating transcription errors.

Stop Guessing. Start Calculating

Whether you are searching for a fast grade calculator, a 3D distance tool, or a reliable COGO inverse engine, you shouldn’t have to rely on clunky spreadsheets. Head over to the calculator and start processing your coordinate data directly in your browser.

Technical Specifications & App Details