Notepad Calculator

A notepad calculator combines a text editor with a calculator: you write several lines just like on a notepad, and any line containing a number or calculation is evaluated instantly. The result appears right next to it, without pressing Enter or using formula syntax. Unlike a classic calculator, the entire calculation stays readable as text – ideal for quotes, budgets or side calculations you want to revisit later.

The heart of it is named values: write rent: 850 to store the value 850 under the name "rent". In any following line, you can use this name like a variable, e.g. rent + electricity – the calculator automatically replaces the names with the previously calculated numbers. This turns a loose list of numbers into a traceable calculation with meaningful names instead of anonymous intermediate results.

For subtotals, the reserved word total is available: it adds up all the numbers in the current block – an empty line automatically starts a new block, so several partial calculations stay cleanly separated. With prev you can access the result of the immediately preceding line, for example to calculate a chain of surcharges one after another.

Percentage calculations can be written in plain language, without any formula: 20% of 80 calculates the share (16), 80 + 20% increases a value directly by the given percentage, and 80 - 20% reduces it the same way. This lets you calculate VAT, discounts or markups for a quote directly in the relevant line, instead of working it out separately.

Use #-comments to structure longer notes: lines starting with "#" are shown as a heading and not included in the calculation – for example to split a quote into "Design", "Development" and "Copywriting". Plain text lines without any digits don't cause an error either; they're automatically recognized as free text. Numbers can be written in German number format – a decimal comma and thousands dots like "1.234,50" are interpreted correctly, and currency symbols like "€" or "EUR" don't interfere with the calculation.

The notepad calculator runs entirely client-side in the browser – your notes are never transmitted to a server, which automatically makes it GDPR-compliant. The share button optionally lets you send a calculation sheet as a link; if you'd rather keep your notes to yourself, simply leave that feature unused.