NumPad is an offline-first notepad calculator for the web. It does calculations with units, dates, variables and more. It even has markdown support! Pro users can make as many documents as they like and sync them between devices.

NumPad is a fast, lightweight web app with support for units, dates and more. It lets you keep notes and calculations in one document, gives you answers as you type, and it understands calculations like "£200 + 20%" or "2500kcal / 1 day in watts".