Surface Area of a Sphere Calculator
Calculates the surface area of a sphere from the measurements you enter. Use any unit, as long as all inputs use the same one.
Result
- Surface area
- 314.1593
How to use the surface area of a sphere calculator
- Enter the radius.
- The results update as you type, or press Calculate.
- Read the surface area first, then the supporting figures below it.
Formula
4πr²
Worked example
For example, with these inputs:
- Radius: 5
the calculator returns:
- Surface area: 314.1593
Background
These calculations appear throughout the Singapore syllabus, from primary school percentages and fractions to secondary school algebra and geometry. Understanding the formula makes problem sums easier because you can recognise which quantity is missing.
Rounding is a common source of small errors. Keep full precision during intermediate steps and round only the final answer to the number of decimal places or significant figures the question asks for.
Frequently asked questions
How does the surface area of a sphere calculator work?
It applies this formula: 4πr²
Can I use any units?
Yes, as long as every input uses the same unit. The answer will be in that unit (squared for areas, cubed for volumes).