Maths & Numbers

Sometimes you just need a quick percentage calculation, or you want to explore the digits of Pi, or you're curious about Kaprekar's constant. These tools handle the everyday maths that comes up at work, school, or just out of curiosity — percentage changes, number base conversions, and a few recreational maths puzzles. The calculations are straightforward and the results are instant. No accounts, no tracking, no fuss.

The Percentage Calculator handles the most common everyday scenarios: calculating a percentage of a number, finding what percent one number is of another, computing percentage increase or decrease between two values, and reverse-engineering the original number before a discount or markup. Each mode shows the formula and working so you can verify the result or use it as a learning tool.

For something more exploratory, the Pi Explorer lets you search for specific digit sequences within Pi's decimal expansion — type in your birthday or any number pattern and see where it appears. The tool displays millions of digits with a searchable index, which makes it useful for both curiosity and education about irrational numbers. The Kaprekar Constant Calculator demonstrates the iterative process where any four-digit number with at least two distinct digits eventually reaches 6174 through repeated subtraction of rearranged digits — a surprisingly elegant result in recreational mathematics.

These tools are particularly useful for students checking homework, professionals validating spreadsheet formulas, or anyone who wants to understand the arithmetic behind a calculation rather than just seeing a result.