410+ free calculators
Finance, health, construction, science, developer tools and more, fast, transparent and free.
Why use 2xKit
Transparent formulas
Every calculator shows exactly how its result is computed.
Privacy-first
Calculations run in your browser, nothing is sent to a server by default.
Fast and accurate
Instant results, precise decimal math for money calculations.
Embed on your site
Business widgets for embedding 2xKit calculators are coming to 2xKit.