All Tools

Boost productivity with the Pomodoro Technique. Alternates 25-minute focused work sessions with 5-minute breaks, tracking your completed cycles.

Estimate your pregnancy due date from your last menstrual period or conception date.

Convert between Pascal, bar, PSI, atm

Check if a number is prime and find all its factors. Also shows prime factorization.

Calculate basic probability, permutations (nPr), and combinations (nCr) with step-by-step formulas.

Calculate gross profit margin and markup percentage from revenue and cost.

Estimate your annual property tax from assessed value and local tax rate.

Find any side of a right triangle using the Pythagorean theorem a² + b² = c². Enter any two sides.

Generate QR codes from text or URLs

Solve ax² + bx + c = 0. Shows discriminant, real or complex roots, and vertex of the parabola.

Calculate Return on Investment as (Gain - Cost) / Cost × 100.

Encode or decode ROT13 cipher

Generate random hex colors

Spin the wheel to make random decisions — add your own choices and let fate decide!

Enter a list of names and randomly pick a winner with a spinning animation effect.

Generate random numbers

Generate random alphanumeric strings

Solve proportions and find missing values. If a:b = c:d, enter any three to find the fourth.

Paste any text to instantly see estimated reading time and speaking time.

Test regular expressions live with real-time match highlighting, capture group inspection, and flag controls.

Remove duplicate lines from text

Compare the total costs of renting versus buying a home over a given number of years.

Reverse any text string

Convert between Roman numerals and decimal numbers. Supports values from 1 to 3,999.