SnapCalx – Calculator & Converter

About

Stop switching tabs to run a quick calculation. SnapCalx lives in your browser and works on every page — highlight any number, expression, or amount and get your answer in a floating tooltip, instantly.

Whether you're checking a price conversion, working out a percentage discount, or converting units while reading an article, SnapCalx is always one highlight away.

Free features:
- Instant maths — highlight any expression like 3*(12+4.5) and see the result
- Percentage shortcuts — "15% of 340" or "20% off 50"
- Interactive mode — select any number and tap +, −, ×, ÷ to keep calculating
- Currency conversion — GBP, USD, EUR, JPY and more
- Quick-calc popup — type any expression without leaving your current tab
- Calculation history — your last 10 calculations, always at hand

Pro features ($3.99/mo):
- Full unit conversion — weight, length, area, volume and temperature
  Examples: "72 kg to lbs", "100 miles in km", "32°F to C", "500 sq ft to sq m"
- Single-unit detection — select "72 kg" to see all conversion options at once
- 150+ currency pairs with live exchange rates, updated daily
- Single currency detection — select "£50" to see conversions to any currency
- Full calculation history (last 50 items)

How it works:
1. Highlight any number or expression on any webpage
2. A tooltip appears instantly with the result
3. Tap Copy to use the result anywhere — or keep calculating

No account required for free features. Your calculations stay on your device and are never sent to our servers.