Surface Area of a Hemisphere Calculator
Calculates the surface area of a hemisphere from the measurements you enter. Use any unit, as long as all inputs use the same one.
Result
- Total surface area
- 235.6194
How to use the surface area of a hemisphere calculator
- Enter the radius.
- The results update as you type, or press Calculate.
- Read the total surface area first, then the supporting figures below it.
Formula
3πr²
Worked example
For example, with these inputs:
- Radius: 5
the calculator returns:
- Total surface area: 235.6194
Background
Calculators are best used to check working rather than replace it, especially for exams where method marks count. Work the problem by hand first, then confirm with the calculator.
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.
Frequently asked questions
How does the surface area of a hemisphere calculator work?
It applies this formula: 3πr²
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).