Volume in a Donut
Calculator how many milliliters, centiliters, deciliters or liters a donut contains.
A circular-ring-shaped donut (or doughnut) is mathematically a torus. Of course, the donut is not perfectly round, which makes this calculation an estimation.
Example: a donut with a total diameter of 8 centimeters and a ring diameter of 3 centimeters has a hole diameter of 2 centimeters and a volume of 0.11 liters.
Please enter two of the three diameters. The volume in milliliters (ml), centiliters (cl), deciliters (dl) and in liters (l) will be calculated.
This doughnut has a measured overall diameter of 10 centimeters, and the ring has a diameter of 4 centimeters. The diameter of the hole is therefore 2 centimeters. The calculated volume is 0.24 liters. This is, of course, not the exact value, as this doughnut visibly deviates from the theoretical shape. However, this 240-milliliter volume is a usable approximation. The calculated volume of 236.87 milliliters is intentionally omitted here, as this suggests an accuracy that cannot be achieved with a shape that deviates from the ideal form.
Other donut-shaped items include swim rings and lifebuoys, bagels, special jewelry rings, and ring-shaped LED lamps for specific lighting effects. Soap bubbles can also be created in this shape using certain tools and techniques. O-rings are sealing rings that are actually very close to the ideal torus shape.
Donuts are frequently mentioned in another area of mathematics, topology. However, this has nothing to do with the calculator here. In fact, quantifiable values like length and volume are not relevant in topology, which is only concerned with the position and arrangement of geometric shapes.
Last updated on 02/07/2026. Author: Jürgen Kummer
Here you can convert metric volume units into customary and imperial units.
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