TR
🔢 Calc
troiso
Rule of three / proportion
troiso is a free, no-sign-up online calc tool: rule of three / proportion. Everything is computed right in your browser — no data is sent to a server, your information stays private. Fast, ad-free, works on mobile and desktop. Keywords: règle de trois, proportion, produit en croix, calcul.
🇨🇭 Go further — Swiss business tool
FAQ
Is troiso free?
Yes. troiso is completely free with no sign-up — rule of three / proportion. No hidden costs, no credit card.
Is my data sent to a server?
No. troiso runs 100% in your browser — everything is computed locally, nothing is transmitted or stored. Your data stays private.
Do I need to register or install anything?
No. Open troiso and start right away — no account, no install. Works on mobile and desktop.