About the project — Schitalka

Schitalka is a set of tools for everyday tasks: estimate wallpaper, tiles or paint, convert units, generate a UUID or a password, run a prize draw on a wheel. Every tool lives on its own page and works without an account.

How it works

The site is static: no server, no database, no accounts. Pages are built ahead of time and all calculations run in the browser with JavaScript. The numbers you type are never sent anywhere — there is nowhere to send them.

Each page explains the formula and its limits and answers the questions people actually ask, instead of repeating the interface.

What you will not find here

sign-up or personal accounts;
ads or third-party analytics;
cookies or data sharing with ad networks;
“leave your phone number” forms.

Only interface and fortune wheel settings are stored in your browser — see the privacy policy for details. Privacy policy.

Contact

Found a calculation error or want to suggest a tool? Write to the site owner: add the site owner’s contact.

Sections

Renovation Wallpaper, tiles and paint: estimate material from room dimensions, with a cutting allowance and without subtracting windows and doors. Math Percentages, shares and changes — the everyday arithmetic behind discounts, markups and comparing numbers. Converters Length, area, mass, volume and temperature, converted between metric and imperial units without memorising factors. Generators Tools that create data rather than calculate it: passwords and random values, generated in the browser. Finance Loans and interest: monthly payment, overpayment and the total cost of money over time, without banking jargon. Randomness Random numbers, coin tosses, dice, list draws and lucky ticket checks — no sign-up required. Identifiers Generate UUID v4 and v7, ULID and NanoID, then validate and decode existing identifiers — all in the browser. Health Quick estimates such as body mass index and WHO categories. A reference point, not a diagnosis.