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Build Your Personal Space with
2on
2on is more than just tools and calculators. Soon you'll be able to create personal dashboards, track finances, monitor creators, save quick links, and manage notes in one place.
Most Commonly Used Calculators
Percentage Calculator
Work out a percentage of a number, what share one number is of another, the change between two values, and adding or removing a percentage.
Tip Calculator
Work out the tip, the total and what each person owes. Rounding up adjusts the tip rather than the total, which is what actually happens at the table.
Week Number Calculator
Free ISO 8601 week number calculator: find which week of the year any date falls in, and see the first and last day of that week at a glance.
Pregnancy Calculator
Free pregnancy calculator: work out your due date, current week and trimester from your last menstrual period, with the estimated conception date.
Most Commonly Used Tools
Slug Generator
Turn any headline into a clean URL slug. German ü becomes ue, Turkish ü becomes u, Cyrillic is transliterated — you pick the language, line by line.
Color Converter
Convert a color between HEX, RGB and HSL, build a scale of shades, and check the contrast ratio against white, black or any second color.
Password Generator
Generate passwords in your browser using your device's cryptographic random source, and see real strength in bits of entropy, not a coloured bar.
Secret Santa
Draw Secret Santa names in the browser: nobody gets themselves, couples can be excluded, and each person reveals only their own match.