Calculators
Hemisphere Calculator
Calculate hemisphere volume, surface area, diameter, and base circumference from a radius locally in your browser.
Enter a radius from 0 (exclusive) to 1000000000 to see the volume ((2/3)πr³), curved surface area (2πr²), total surface area (3πr²), diameter (2r), and base circumference (2πr). The calculation runs locally in your browser; your value is not uploaded or stored.
Find hemisphere measurements without uploading anything.
Enter a radius from 0 (exclusive) to 1000000000 to see the volume, curved surface area, total surface area, diameter, and base circumference. Everything runs locally in your browser, so your value is not uploaded or stored.
Frequently Asked Questions
Everything you need to know about this tool, how it works, and privacy.
What does the hemisphere calculator show?
Enter a radius from 0 (exclusive) to 1000000000. The calculator returns the volume ((2/3) times pi times r cubed), the curved surface area (2 times pi times r squared), the total surface area (3 times pi times r squared), the diameter (2 times r), and the base circumference (2 times pi times r). For example, a radius of 5 gives volume about 261.799387799, curved surface area about 157.079632679, total surface area about 235.619449019, diameter 10, and base circumference about 31.4159265359.
Which formulas does the hemisphere calculator use?
It uses volume = (2/3) x pi x r^3, curved surface area = 2 x pi x r^2, total surface area = 3 x pi x r^2 (the curved area plus the circular base area pi x r^2), diameter = 2 x r, and base circumference = 2 x pi x r, where r is the radius you enter and pi is the standard mathematical constant.
Which inputs are accepted?
Enter a radius greater than zero through 1000000000. Decimal values are accepted. Zero, negative numbers, non-numeric text, and values above the limit show a clear error instead of a result.
Do my numbers stay private?
Yes. The calculation and copy action run locally in your browser. CodeASystem does not upload or store the value you enter.