Number Tools

Check prime numbers online and review factor counts, nearby primes, and composite results quickly.

Convert between Roman numerals and standard numbers in a lightweight browser-based tool.

Calculate with fractions online and review the simplified result as a fraction, decimal, and percent.

Calculate an overall average grade from multiple scores and check the basic letter result.

Split a bill faster by calculating tip, total cost, and per-person share in one screen.

Work out final price, total savings, and tax impact before buying or pricing something.

Calculate BMI from height and weight and review the standard category range in seconds.

Start a live countdown for events, classroom focus blocks, or quick activities.

Switch between common units for everyday study, classroom work, and quick checks.

Reduce ratios and divide a total amount into proportional shares.