Measure STL, STEP & GLB models online
Open a CAD or mesh file and measure distances, angles and hole diameters, read dimensions, volume, surface area and mass by material, cut cross-sections and export a parts BOM — all in your browser. Free, private, nothing uploaded.
Measure
Click a part to isolate it and see its own dimensions.
Dimensions & mass
Load a model to see its dimensions, volume, surface area and mass.
Cross-section
Measuring tips
- Snap is on by default — clicks land on the nearest corner or edge vertex, which is where CAD tessellations keep exact dimensions.
- Hole diameters: click three points spread around the rim (not in a line). The fit is a true 3D circle, so it works on tilted faces too.
- Units: STEP/IGES are read in millimetres from the file. Mesh formats carry no units, so the tool applies each format’s convention — if a model looks 10×, 25×, or 1000× off, switch File units rather than the display unit.
- Mass multiplies the closed-mesh volume by the material density — pick the right material, and expect open or hollow meshes to read low.
- X-ray + cross-section together show internal pockets, wall thickness and hidden holes.
Capabilities
What it does
- Opens STEP / IGES (via OpenCascade in WebAssembly) and every common mesh format — STL, 3MF, OBJ, GLB/glTF, FBX, PLY, USDZ — locally in your browser.
- Point-to-point distance with X/Y/Z deltas, three-point angles, and true 3D hole diameters from three rim points — clicks snap to corners and edges for exact numbers.
- Dimensions, volume, surface area, centre of mass and mass by material (PLA, resin, aluminium, steel, brass…) for the whole model or any single part.
- Live cross-section: cut along X, Y or Z, see the section outline and its area, and combine with X-ray shading to inspect walls and hidden pockets.
- STEP assemblies show a parts list — isolate a part, read its own numbers, export a BOM as CSV, or download one part as STL or GLB.
- 100% in your browser — proprietary CAD never leaves your device. No account, no upload, no watermark.
Process
How it works
- Drop a modelDrag a STEP, IGES, STL, 3MF, OBJ or GLB file onto the tool. It’s read locally — CAD files are tessellated by OpenCascade running in WebAssembly.
- Measure & inspectPick Distance, Angle or Hole ⌀ and click on the model; switch units between mm, cm and inch. Dimensions, volume and mass update for the selected part or the whole model.
- Section & exportCut a cross-section to check internal geometry, then save a screenshot with your dimensions, export the BOM as CSV, or download a part as STL/GLB.
Notes
Good to know
- Mesh files carry no units, so each format’s convention is applied (glTF/GLB and DAE in metres, FBX and USD in centimetres, STL/3MF/OBJ in millimetres). If a model looks 10×, 25× or 1000× off, switch its File units in the tool — or fix the file for good with the STL scale tool.
- Volume, mass and centre of mass assume a closed, sealed mesh. Open meshes are flagged; repair them first for reliable numbers.
- STEP and IGES geometry is measured on the tessellated surface (fine deflection), so curved faces are accurate to a small fraction of a millimetre rather than analytically exact.
- Very large meshes (millions of triangles) can take a while to index and use a lot of memory on phones.
FAQ
Questions, answered
Can I measure a STEP file without CAD software?
Yes. The tool reads STEP and IGES files with OpenCascade compiled to WebAssembly, so you can view parts, take dimensions, get volume and mass, and export a parts list — without installing anything and without uploading your file anywhere.
Is my file uploaded to a server?
No. Everything — parsing, tessellation, measuring, sectioning and exporting — runs in your browser. Your model never leaves your device, which matters for confidential CAD.
How do I measure a hole diameter?
Choose Hole ⌀ and click three points spread around the hole’s rim. The tool fits a true 3D circle through them and reports the diameter, so it works on angled faces as well as flat ones.
How is mass calculated?
Mass = closed-mesh volume × the density of the material you pick (common filaments and engineering metals are built in). For an accurate number the mesh must be sealed and the units correct.
Which formats are supported?
STEP (.step/.stp), IGES (.iges/.igs), STL, 3MF, OBJ, GLB/glTF, FBX, PLY, DAE, VRML and USDZ.
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