The question we hear most from customers isn't about ingredients. It's "how long until it grows back?" The usual answers are a vague "two to six weeks" or a forum thread that contradicts itself.

So I built a small tool that answers it for your own dates: Hair Regrowth Timeline Calculator (there's also a Spanish version ). You pick a removal method, a body area and the date you last removed hair. It shows an estimated regrowth window, a 12-week plan for judging results with photos, and a printable 30-day tracker.

It's one HTML file, one CSS file and about 200 lines of plain JavaScript. There's no framework, no build step, no analytics and no backend. Nothing you type leaves the browser.

Here's how it works.

The biology, in one paragraph

Hair follicles cycle through three phases: anagen (growing), catagen (transitioning) and telogen (resting). At any moment your hairs are spread across all three, which is why regrowth shows up gradually instead of all at once.…