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Donut Calculator
Volume and surface area of a donut shape (torus) from its outer and inner diameters.
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Volume
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Volume and surface area of a donut shape (torus) from its outer and inner diameters.
Donut Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: V = 2 pi2 R r2.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Donut Quick Guide
Typical values for reference.
| Outer cm | Hole cm | Volume | |
|---|---|---|---|
| 10 | 3 | 196.5 cm3 | |
| 8 | 2 | 111.0 cm3 | |
| 12 | 4 | 315.8 cm3 | |
| 6 | 1.5 | 46.8 cm3 | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Donut Calculator FAQ
Answers to common questions about this calculator.
With the torus formula 2 pi squared times R times r squared.
Ring radius and tube radius.
Roughly.
Add the surface area times thickness.