Block Shape Generator is a small, independent website with free tools for planning circles, ovals, spheres and domes block by block. It was made for builders who want an exact plan they can follow on a phone or on paper next to the game, with block counts and a way to tick off what they have placed.
Every tool runs in your browser. There is no account and nothing to install.
Block Shape Generator is not an official Minecraft product and is not approved by or associated with Mojang or Microsoft. Minecraft is a trademark of Mojang Synergies AB.
More tools for builders are being added. If a plan looks wrong, the method behind each shape is explained on its page, so you can check it.