How to change a torus radius in Blender

A torus in Blender has two separate radius values: the major radius (which controls how far the tube extends from the center) and the minor radius (which controls the thickness of the tube itself). You change these values in the object's properties panel after you create the torus, or you can adjust them while the torus is still being created by using the operator panel that appears immediately after you add it.

The fastest method is to use the properties panel on the right side of your screen. Select your torus, look for the "Object Data Properties" tab (it looks like a green torus icon), and you'll see two fields labeled "Major Radius" and "Minor Radius" where you can type in exact numbers or use the slider to adjust them visually.

Key Takeaways

  • A torus has two separate radius values: major radius controls the overall size, and minor radius controls the tube thickness.
  • You can change both radius values in the Object Data Properties panel on the right side of the screen after selecting your torus.
  • If you just created the torus, the operator panel at the bottom left lets you adjust the radii before confirming the creation.
  • Typing exact numbers into the radius fields gives you precise control, while dragging the sliders lets you see changes in real time.

Finding the Object Data Properties panel

After you add a torus to your scene (using Shift+A, then Mesh, then Torus), the object appears in your viewport. To change its radius values, you need to access the Object Data Properties panel, which is located on the right side of the screen in the properties editor.

Look for a row of icons at the top of the properties panel on the right. The icon that looks like a green torus (or donut shape) is the Object Data Properties tab. Click it, and you'll see a section labeled "Torus" with expandable options. Under that section, you'll find "Major Radius" and "Minor Radius" fields where you can enter new values.

Adjusting the major radius

The major radius is the distance from the center of the torus to the center of the tube. If you increase this value, the entire torus gets larger and the tube moves farther away from the center point. If you decrease it, the torus shrinks and the tube moves closer to the center.

To change it, click on the number field next to "Major Radius" and type a new value, then press Enter. You can also click and drag the number itself to adjust it smoothly, or click the small arrow icon next to the field to open a slider. The default value is 1 unit, but you can use any positive number. Common values range from 0.5 to 5 units depending on the scale of your project.

Adjusting the minor radius

The minor radius controls how thick the tube is. A smaller minor radius makes the tube thinner and more delicate, while a larger minor radius makes the tube fatter and more substantial. The minor radius must always be smaller than the major radius, or the torus will look distorted.

Change the minor radius the same way you change the major radius: click the number field, type a new value, and press Enter. The default is 0.25 units. If you want a thin wire-like torus, try values between 0.05 and 0.15. For a chunky, thick torus, use values between 0.3 and 0.5. Always make sure your minor radius is at least a few times smaller than your major radius for a normal-looking torus.

Using the operator panel immediately after creation

When you first add a torus to your scene, Blender shows an operator panel in the bottom left corner of the viewport. This panel lets you adjust the major radius, minor radius, and other settings before you confirm the torus creation. If you close this panel or click elsewhere, it disappears and you'll need to use the Object Data Properties panel instead.

To use the operator panel, look for the fields labeled "Major Radius" and "Minor Radius" and change the values before you do anything else. You can also adjust the number of vertices (which affects how smooth the torus looks) in this same panel. Once you're happy with the settings, click anywhere in the viewport or press Enter to confirm, and the torus is created with those exact values.

Making the changes visible in your viewport

If you change the radius values but don't see the torus update in your viewport, you may be in a viewport shading mode that doesn't refresh quickly. Press the spacebar and type "Shade Smooth" to ensure the torus displays smoothly, or simply rotate your view by middle-clicking and dragging to force a viewport refresh.

You can also press the "Z" key and select "Solid" shading to make sure you're viewing the torus in a mode that shows geometry clearly. If the torus still doesn't look right, make sure you selected the correct object by clicking on it in the viewport — the outline should turn orange when it's selected, and you should see its name highlighted in the outliner panel on the right.

Common mistakes when changing torus radius

The most common mistake is making the minor radius larger than the major radius, which creates a self-intersecting torus that looks broken. Always keep the minor radius significantly smaller — a good rule is to make the minor radius about one-quarter to one-third of the major radius value.

Another frequent issue is changing the radius values in the wrong panel. If you're looking at "Object Properties" (the cube icon) instead of "Object Data Properties" (the torus icon), you won't see the radius fields at all. Double-check that you're in the correct properties tab. Also, if you're working with a torus you created a while ago, the operator panel is long gone — you must use the Object Data Properties panel to make changes.

Frequently Asked Questions

Can I change the radius of a torus after I've already used it in my scene?

Yes. Select the torus in your viewport, go to the Object Data Properties panel (the green torus icon on the right), and change the major or minor radius values. The torus updates immediately in your scene, and any modifiers or materials you've applied stay attached to it.

What's the difference between major radius and minor radius?

Major radius is the distance from the center of the torus to the center of the tube. Minor radius is the thickness of the tube itself. Together they define the overall shape and proportions of the torus.

Why does my torus look weird after I changed the radius?

The most likely reason is that your minor radius is too large compared to your major radius. Try making the minor radius smaller — it should be roughly one-quarter to one-third of the major radius value. If the torus still looks off, check that you're viewing it in Solid shading mode by pressing Z and selecting Solid.

Can I type in decimal numbers for the radius, or only whole numbers?

You can use decimal numbers. Values like 1.5, 0.75, or 2.25 work perfectly fine. This lets you fine-tune the exact size and proportions of your torus to match your project needs.

If I change the radius, do I need to re-apply my materials or textures?

No. Changing the radius values doesn't affect materials, textures, or any modifiers you've applied to the torus. Everything stays in place and scales with the new radius values.