calcnote.io

Type a formula freely. As soon as the current line can be evaluated, a ghost preview with = and the result appears on the right. Enter confirms it, and when you edit a completed line the value after = updates automatically.
Operators: +, -, *, /, %, ^ Functions: sqrt(), sin(), cos(), tan(), abs(), log() Constants: pi, e

About calcnote

calcnote.io is a text-based calculator notebook built for quick math, scratch-work, and iterative edits. You can type freely, see inline result previews, confirm results with keyboard actions, and continue writing without leaving the editor. The app runs directly in your browser and stores your note content locally on your device.

Common examples