Calculate percentages, ratios, increases and decreases instantly.
Yes, completely free. No subscription, no credit card, no hidden fees.
No. There is no login, no sign-up, and no account required. Just open the page and use it.
Yes. Everything runs entirely in your browser. Your files and data are never sent to any server.
Yes. Once the page has loaded, you can use it without an internet connection. Pocket Wrench is a Progressive Web App (PWA).