Free Online Stereonet Plotter
Enter your strike and dip measurements and plot them on a lower-hemisphere equal-area (Schmidt) stereonet — as poles to planes or great circles — with a strike rose diagram. Runs entirely in your browser. Free, no sign-up.
Add a measurement
Or paste a list
One measurement per line as strike,dip (e.g. 045,30).
Measurements (0)
Stereonet · equal-area · lower hemisphere
Strike rose
Summary
- Planes
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- Mean dip
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- Dip range
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- Dominant trend
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How to use the stereonet plotter
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1
Enter strike and dip. Type a strike (right-hand rule) and dip, then press Add to plot. Prefer dip direction? Tick the box and the tool converts it to strike for you.
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2
Or paste a whole dataset. Paste one
strike,dipper line and press Plot list to plot dozens of measurements at once. -
3
Switch poles and planes. Toggle between poles to planes (one dot per measurement — best for spotting clusters and girdles) and great circles.
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4
Read the rose and stats. The strike rose shows orientation frequency; the summary gives mean dip, dip range, and the dominant strike trend. Download the stereonet as a PNG for your report.
What is a stereonet?
A stereonet (stereographic net) is a 2D plot that represents 3D orientation data — the strikes and dips of planes, or the trends and plunges of lines. Structural geologists use the lower-hemisphere equal-area (Schmidt) projection because it preserves the density of data points, which makes clusters, girdles, and preferred orientations easy to see.
Each plane can be shown two ways: as a great circle (the arc where the plane intersects the hemisphere) or as a single pole (the point representing the line perpendicular to the plane). Poles are usually preferred when you have many measurements — a tight cluster of poles means consistently oriented planes, while poles spread along a great-circle path (a girdle) often indicate folding.
New to this? Read our step-by-step guide: How to read a stereonet (with examples), or learn how to measure strike and dip in the field.
Stereonet plotter FAQ
Is this stereonet plotter free?
Yes — completely free, no sign-up, and it runs entirely in your browser. Your measurements never leave your device.
Is it equal-area or equal-angle?
Lower-hemisphere equal-area (Schmidt) — the standard for structural geology because it preserves data density for spotting clusters and girdles.
Which strike and dip convention does it use?
Strike uses the right-hand rule (dip is 90° clockwise from strike). You can also enter dip direction + dip — tick the box and it converts to strike automatically.
Can I plot strike and dip on my phone in the field?
Yes. The free GeoKit app measures strike and dip with your phone and builds an interactive stereonet, rose diagram, and dip histogram from your measurements automatically — even offline.
Take the stereonet to the field
GeoKit measures strike & dip with your phone and builds the stereonet, rose, and dip stats for you — free, offline, on iOS & Android.
