About Age & Sleep Calculator

Why we built free, browser-only calculators

Age & Sleep Calculator started with a simple observation: everyday questions like "exactly how old am I in days?" or "what time should I go to bed?" should not require an account, a download, or handing personal data to a company. We built two small, focused tools that answer those questions instantly, right in the browser tab.

Everything is calculated with plain calendar and time math, on your device. The tools are free because they cost almost nothing to run, and we intend to keep them that way — no paywalls, no premium tiers, no ads that follow you around.

Built by minitoolsz

This site is a project of minitoolsz — a small independent maker focused on fast, useful, no-nonsense web tools. The same privacy-first philosophy runs through every tool we build: no signup walls, no data collection, no dark patterns.

You can follow minitoolsz here:

• X (Twitter) — @minitoolszz
• Threads — @minitoolszz
• Instagram — @minitoolszz

Our values

• Privacy first — your birth date and sleep times never leave your device. There is nothing to sell and nothing to store.
• Speed — no server round-trips. Pages load fast and calculations respond instantly.
• Simplicity — one clear question, one clear answer. No dashboards, no features nobody asked for.
• No signup — open the page and use it. No email, no password, no profile to maintain.

What we do not do

To keep the promise above, we deliberately avoid the usual web conveniences that come at your expense:

• No accounts — we cannot remember you, because we do not try to.
• No tracking — no analytics scripts, no fingerprinting, no marketing pixels.
• No data collection — your inputs live in the current browser session and are never transmitted anywhere.
• No backend — the site is a set of static files served over HTTPS. There is no application server and no database.

Talk to us

The site is a small project, and feedback genuinely shapes it. If something is confusing, or if you would like a feature, email minitoolszz@gmail.com.

Try the Age Calculator, the Sleep Calculator, or read more on the Contact page.