Lifestyle
Everyday tools that save you a search
Age, GPA, sleep cycle, unit converter, percentage, word count, reading time — the small things you reach for daily, in one place, fast.
16 tools
- Age CalculatorCalculate exact age in years, months, days, hours, and minutes from a birth date.
- Percentage CalculatorThree modes: X% of Y, X is what % of Y, % change from X to Y. Discounts, taxes, grades, growth rates.
- GPA CalculatorCalculate cumulative GPA on the US 4.0 scale. Add courses with grade and credit hours, get weighted average.
- Unit ConverterConvert length, weight, temperature, volume, and speed between metric and imperial units.
- Date Difference CalculatorCalculate years, months, days, weeks between two dates. Handles leap years and short months correctly.
- Word & Character CounterCount words, characters (with/without spaces), sentences, paragraphs. Live updates. Tweet-length tracker built in.
- Reading Time EstimatorEstimate reading and speaking time from text. Adjustable WPM for different audiences.
- Random Picker — Dice, Coin, Number, NameOne screen for all random picks: dice roll, coin flip, random number range, pick from a list.
- Scientific CalculatorExpression-based scientific calculator. Trig, log, exp, factorial, constants. Keyboard-friendly.
- Statistics Calculator — Mean, Median, Std DevPaste a list of numbers, get mean, median, mode, range, variance, standard deviation, quartiles.
- Final Grade CalculatorWhat do I need on the final? Given current grade + final weight + target grade, calculate the required score.
- Time Card CalculatorSum daily work hours from clock-in/clock-out times, subtract unpaid breaks. Weekly total + pay.
- Triangle CalculatorSolve a triangle: three sides → angles + area (Heron). Pythagorean check for right triangles.
- Shoe Size Converter — US / EU / UK / JPConvert shoe sizes across US, EU, UK, and JP (cm). Men, women, kids. Approximate — brands vary.
- Readability Analyzer (Flesch-Kincaid)Flesch Reading Ease + Flesch-Kincaid Grade Level + Gunning Fog. English text only.
- Pomodoro Timer25-minute focus blocks with 5-minute short breaks and 15-minute long breaks. Audio cue via Web Audio oscillator.
Choosing between these tools
The largest group on the site, and the least thematic: these are the calculators people reach for once and want to finish in ten seconds. Percentages, ages, date gaps, unit conversions, grades, timesheets.
A few repay a second look. The statistics calculator reports both sample and population standard deviation, which are different numbers and are routinely confused. The readability analyzer runs Flesch-Kincaid, so it measures sentence and syllable length rather than whether the writing is any good — useful as a signal, misleading as a target. The random picker uses the browser's cryptographic random source, so a draw is not merely shuffled by a predictable seed.
The time card calculator handles overnight shifts and unpaid breaks, which is where hand arithmetic usually breaks down. The unit and shoe size converters cover the everyday conversions worth not guessing at. Nothing here needs an account and nothing is stored.