About calc/based
Good calculators are tools, not products. calc/based exists to deliver precise results in seconds, with nothing asked in return.
What is calc/based
calc/based is a collection of free online calculators for finance, health, math, cooking and construction. Everything runs 100% in your browser — the data you type never leaves your device. No login, no signup, no tracking cookies.
The idea is simple: technical tools deserve a technical interface. Each calculator is built from scratch, optimized for speed, and uses official formulas with documented references.
Principles
Total privacy
Nothing you type is sent to servers. All computation happens in your browser — no signup, no tracking, no tracking cookies.
Speed
Instant results. No loading screens, no server roundtrips. Lighthouse 100 is the floor, not the goal.
Free
All calculators are 100% free, with no signup and no intrusive ads. We don't sell your data — we don't have your data.
Open & verifiable
Formulas follow official sources (Central Bank, WHO, IBGE, ABNT, etc.) and are documented in each calculator. You can audit.
Who maintains
calc/based is an independent project, made in Brazil. It's not a company, has no investors, no sales team. It's a personal effort to make available tools that usually come bundled in apps full of ads and signup forms.
For suggestions, corrections or new calculator requests, use the contact page.