Surface Area of Sphere Calculator

Enter the radius to calculate a sphere’s surface area instantly.

Radius

About Surface Area of Sphere

The Surface Area of Sphere Calculator is a free, easy-to-use tool for computing the total outer area of a sphere from its radius (or diameter). Whether you’re studying geometry or working in physics, design, or engineering, you’ll get accurate results in seconds.

What is a Sphere?

A sphere is a perfectly round 3D object with every point on its surface equidistant from the center. Examples include balls, bubbles, and planets. The surface area measures the total area covering its exterior.

Common real-life examples:

Sports – Footballs, basketballs, tennis balls.

Nature – Soap bubbles and droplets.

Astronomy – Planets, moons, stars.

Design – Globes, ornaments, 3D models.

Formula for Surface Area of a Sphere

Use the standard formula:

Surface Area = 4 × π × r²

Where r is the radius and π ≈ 3.1416.

Using diameter instead of radius:

Surface Area = π × d²

Example Calculations

Using Radius:

If r = 6 cm:

Surface Area = 4 × 3.1416 × (6²)
= 4 × 3.1416 × 36
≈ 452.39 cm²

Using Diameter:

If d = 14 cm:

Surface Area = 3.1416 × (14²)
= 3.1416 × 196
≈ 615.75 cm²

Features of the Surface Area of Sphere Calculator:

Quick inputs for radius or diameter

Supports cm², m², in², ft², etc.

Instant and accurate results

Works on mobile, tablet, and desktop

Free to use, no registration

Ideal For:

Math and geometry students

Teachers and educators

Engineers and architects

3D modeling & physics simulations

DIY and everyday applications

Calculate sphere surface areas with ease — fast, accurate, and beginner-friendly.