Custom calculator builder Simple + advanced modes Forkable calculator pages

Create custom online calculators and browse published ones.

Build simple calculators in a few clicks or switch to advanced mode for sections, custom field types, multiple outputs, and reusable formulas. Test before publishing, then share a permanent calculator page that other people can fork. Scroll down to browse the latest published calculators from the community.

Start building Browse published calculators

Build A Calculator helps anyone turn repeated math into a reusable online tool. Create calculators for finance, shopping, classroom math, construction estimates, pricing tools, fitness formulas, and technical workflows. Published calculators can be browsed below, while the builder lets you create and publish new ones from scratch.

Calculator builder

Build for real visitors from search and direct links. Simple mode is on by default.
Simple mode Advanced mode
Inputs
Name the values your visitors will enter.
Supports +, -, *, /, ^, parentheses, constants (pi, e) and functions like sqrt, pow, sin, cos, tan, min, max, and round.
Test before publish
Update the preview with your test values before saving or publishing.
Can I start with a basic calculator first?
Yes. Simple mode keeps the experience focused on title, description, inputs, formula, and result label. Switch to advanced mode when you want sections, custom field types, or multiple outputs.
What kinds of calculators can I build?
Popular uses include finance calculators, construction estimators, engineering helpers, pricing tools, health calculators, fitness formulas, and classroom math tools.
Can other people build on top of my calculator?
Yes. Published calculators can be forked into new drafts, which makes it easy to create variants without changing the original version.

Build A Calculator makes it easier to create custom calculators online, publish public calculator pages, and browse live calculators created on the site.