Handy little tools for everyday tasks.
A simple tap counter. Count up or down with one tap, great for reps, people, stitches or inventory.
Generate strong, random passwords with full control over length and character types. Everything happens in your browser.
Create a QR code from any text or URL. Choose the error correction, colors and quiet zone, then download it as PNG or SVG. Everything runs in your browser.
A countdown timer and a stopwatch in one. Set hours, minutes and seconds for the timer, or track laps with the stopwatch. Includes an alarm sound.
Calculate your Body Mass Index from weight and height in metric or imperial units. See your WHO category, your healthy weight range and an age-based reference.
Estimate your basal metabolic rate, the calories your body burns at rest, with the Mifflin-St Jeor, Harris-Benedict and Katch-McArdle equations, plus your TDEE for your activity level.
Estimate your body fat percentage with the US Navy tape method or a BMI-based formula, plus your fat mass and lean mass, in metric or imperial units.
Estimate how much water to drink each day from your body weight, exercise and climate, with the amount in liters, cups, ounces and glasses, alongside the EFSA and US health baselines.
Estimate your daily protein needs from your body weight and goal, from general health to building muscle or losing fat. Metric and imperial units.
Work out the days between two dates, or add and subtract days, weeks, months and years from a date. Shows the duration, total days and the weekday.
Estimate your daily calorie needs (BMR and TDEE) from your sex, age, height, weight and activity level, with targets for losing, maintaining or gaining weight.
Work out percentages six ways: a percent of a value, what percent one number is of another, the base behind a percent, percentage change, increase or decrease, and percentage difference.
Convert length, weight, temperature, volume, area, speed and data units instantly.
Convert between 30+ currencies using daily European Central Bank reference rates.
Calculate your exact age in years, months and days, plus totals and your next birthday.
Generate random numbers in any range, with or without duplicates, using secure randomness.
Convert a time across the world's major time zones, with daylight saving handled automatically.
Solve proportional and inverse rule-of-three problems: if A corresponds to B, what does C correspond to?
Work out the tip and split the bill between any number of people, with optional rounding up.
Calculate your weighted grade average from German school grades (1 to 6) with custom weights.
Work out the fuel cost of a trip from distance, consumption and fuel price, and split it between passengers.
Calculate the final price after a percentage discount, or find the discount percentage from the original and sale price.
Estimate your blood alcohol concentration in per mille with the Widmark formula, based on the drink, your weight and the time elapsed.
Work out what an appliance costs to run from its power draw, daily usage and your price per kWh.
Calculate your Italian degree grade (voto di laurea) from exam grades in trentesimi. Enter each exam grade and CFU, add thesis points and bonus, and get the 110-scale grade plus ECTS and approximate US GPA.