Torus Surface Area Calculator
Enter the tube radius and center radius of a torus (donut shape) to calculate its surface area instantly.
Torus Surface Area Calculator
Our Torus Surface Area Calculator finds the outer surface area of a torus — the donut-shaped surface formed by revolving a circle around an axis outside of it — from its two radii.
What Is a Torus?
A torus is defined by two measurements: the center radius (R), the distance from the very center of the torus to the center of the tube, and the tube radius (r), the radius of the circular cross-section (the "tube") that was revolved around to form the shape.
Torus Surface Area Formula
Where R is the center radius and r is the tube radius.
Example Calculation
R = 8, r = 3
Surface Area = 4 × π² × 8 × 3 ≈ 947.48
✓ Surface Area ≈ 947.48
Features of Our Torus Surface Area Calculator
Who Can Use This Calculator?
👉 Try our Torus Surface Area Calculator to find any torus's surface area in seconds.