Hemisphere Calculator
Find the volume, curved surface area, and total surface area of a hemisphere (half a sphere) from its radius.
Inputs explained
- Radius — Radius of the hemisphere.
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: A hemisphere with radius 3 has volume ≈ 56.55 and total surface area ≈ 84.82.
Frequently asked questions
What's the difference between curved surface area and total surface area here? Curved surface area is just the domed outer half (2πr²), while total surface area also adds the flat circular base (πr²), giving 3πr² overall.
Is a hemisphere's volume exactly half a sphere's volume? Yes, since a hemisphere is literally half a sphere cut through its center, its volume is exactly (2/3)πr³, which is half of the full sphere's (4/3)πr³.
Is the Hemisphere Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Radius. Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Hemisphere Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.