38 tools
Everyday Utility Tools
Five small everyday tools: compare shelf prices per unit, split an unequal bill down to the item, estimate the mobile data a month needs, plan document renewals, and print a wallet emergency contact card.
About these tools
Small domestic calculations rarely deserve an account, an app or an advert-heavy page. These five do the arithmetic that actually decides something - which pack is cheaper per kilogram, who owes what after dinner, whether your data plan survives the month, when your passport stops being accepted - and then get out of the way.
The two tools that touch personal information, the document expiry planner and the emergency contact card, keep everything in the browser tab, store nothing by default and warn you before any export leaves your device. The data-usage figures are transparent, editable assumptions rather than measurements of your phone.
Popular tasks
All Everyday Utility Tools
- Unit Price Comparison Calculator Compare shelf prices honestly: convert every pack to the same unit - per kilogram, litre, 100 g or item - handle multipacks and promotions such as three for two, and rank them by what you really pay per unit.
- Unequal Bill Split Calculator Split a bill that was never equal: assign items to the people who had them, share the rest, apportion service charge, tax and tip in proportion, then see the shortest set of payments that settles everyone up.
- Mobile Data Usage Calculator Estimate how much mobile data your month actually needs: streaming, video calls, music, social and browsing at rates you can adjust, the daily allowance a plan gives you, and the day your allowance runs out at this pace.
- Document Expiry Planner Keep track of documents that expire: expiry dates with the lead time each renewal needs, a warning when a passport falls inside a destination's six-month validity rule, a sorted timeline, and calendar reminders.
- Emergency Contact Card Maker Make a wallet-sized emergency card: contacts, blood group, allergies, medication and insurance details, laid out to print at the right size, exportable as a vCard, and built entirely in your browser with nothing stored.
- Age Difference Calculator Find the exact age gap between two people from their dates of birth: years, months and days, total days and weeks, who is older, and the age each person was when the other was born.
- Alarm Clock Online Set one or more alarms for a time of day in your browser, pick a tone and volume, add a label, snooze or dismiss, and see a large clock while it waits. Nothing is installed and nothing leaves the tab.
- Anniversary Calculator Enter the date you met, married or started a job and see how long it has been in years, months, weeks and days, the next round-number milestones such as 1,000 days, and the traditional gift for each wedding year.
- Alcohol BAC Calculator Estimate blood alcohol concentration with the Widmark formula from the drinks you had, their strength, your body weight and the time since you started, and see roughly when it falls to zero. An estimate, never a test.
- Air Fryer Conversion Calculator Convert a conventional or fan oven recipe to an air fryer: a lower temperature, a shorter time and check-points to shake or turn, in Celsius or Fahrenheit, with food-type adjustments and a printable conversion chart.
- Zodiac Compatibility Calculator Compare two star signs by birth date or sign: element and modality pairing, the traditional aspect between the signs, and a transparent score built from rules you can see - astrology tradition, clearly labelled, not science.
- Zodiac Moon Sign Calculator Find the zodiac sign the Moon was in when you were born, calculated from your birth date, time and time zone with the Moon's true position, plus a warning when the Moon changed sign that day so the birth time matters.
- Zodiac Rising Sign Calculator Calculate your rising sign (ascendant) from birth date, exact time and the latitude and longitude of the birthplace, with local sidereal time and the ascendant degree shown so you can see why a few minutes can change it.
- Zodiac Birth Chart Calculator Draw a natal chart from birth date, time and place: Sun, Moon and planets by sign and degree, the ascendant and midheaven, whole-sign or equal houses, major aspects, and a table you can download - computed in your browser.
- Zodiac Animal Calculator (Chinese Zodiac) Find your Chinese zodiac animal, element and yin or yang from your full birth date, using the actual Lunar New Year date for that year so January and February birthdays are placed correctly, with animal compatibility.
- Zodiac Venus Sign Calculator Find the zodiac sign Venus occupied on your birth date from its calculated geocentric position, whether it was retrograde, and the dates it entered and left that sign - the birth time only matters on a change day.
- Zodiac Saturn Return Calculator Find when transiting Saturn comes back to the position it held at your birth: the exact return dates, including the retrograde passes that make one return happen up to three times, for your first and second returns.
- Zodiac Mercury Retrograde Calendar List every Mercury retrograde period for any year with the station dates, the pre- and post-retrograde shadow periods and the signs involved, computed from Mercury's position rather than copied from a list, plus calendar export.
- Zone 2 Heart Rate Calculator Find your Zone 2 heart rate range three ways - percentage of maximum, heart rate reserve (Karvonen) from your resting pulse, and the MAF 180 method - side by side, with the talk test and why the methods disagree.
- Zoom Lens Crop Factor Calculator Convert a lens's focal length and aperture to the full-frame equivalent field of view and depth of field on APS-C, Micro Four Thirds, 1-inch and phone sensors, and compare the angle of view of two camera setups.
- Zen Box Breathing Timer Follow a guided box breathing exercise with an animated square, optional soft tones and vibration: inhale, hold, exhale and hold for the count you set, plus 4-7-8 and other patterns, for as many rounds as you choose.
- Zone Diet Block Calculator Calculate your daily Zone diet blocks from lean body mass and activity: protein, carbohydrate and fat blocks per day and per meal, the grams they stand for, and a simple meal split you can print.
- Macro Calculator Work out daily calories and macronutrients for losing fat, maintaining or gaining muscle: Mifflin-St Jeor energy needs, a protein target per kilogram, then carbs and fat in grams and per meal, every assumption editable.
- Military Time Converter Convert between military (24-hour) time and 12-hour AM/PM time in either direction, read times the way they are spoken ("fourteen hundred"), paste a whole list at once, and keep a printable 24-hour chart.
- Menstrual Period Calculator Predict your next periods from the last start date and cycle length, or from a log of past cycles so the average and variation are your own, and see likely fertile days and a calendar file - kept only in your browser.
- Months Between Dates Calculator Count the months between two dates as whole calendar months, months and days, and decimal months, with the end-of-month rule spelled out and the results Excel's DATEDIF and YEARFRAC would give for the same dates.
- Measuring Cups to Grams Converter Convert cups, tablespoons and teaspoons to grams and back for each ingredient - flour, sugar, butter, rice, milk and dozens more - since a cup of flour and a cup of sugar weigh very differently, with US, metric and UK cups.
- Dice Roller Roll one to twenty dice of any type - d4, d6, d8, d10, d12, d20 or custom - with animated dice, totals, modifiers, advantage and disadvantage, dice notation such as 3d6+2, and a roll history, using the browser's secure random source.
- Day of the Week Calculator Find the day of the week for any date in history or the future, see the working with Zeller's congruence and the Doomsday rule, check a list of dates at once, and handle the Julian-to-Gregorian calendar change correctly.
- Dog Age Calculator Convert your dog's age to human years by size class - small, medium, large or giant - and with the 2020 epigenetic-clock formula, showing why "multiply by seven" is wrong and which life stage your dog is in now.
- Decision Wheel Spinner Type names or choices and spin a colourful wheel to pick one at random - for raffles, classrooms, games or yes-or-no decisions - with weights, remove-the-winner mode, sound, and a fair, secure random result you can verify.
- Date Countdown Timer Count down to a date and time - a birthday, exam, holiday or launch - in days, hours, minutes and seconds, in any time zone, with a full-screen view, a shareable link and a calendar reminder for the moment it ends.
- Digital Clock Show a large, full-screen digital clock with seconds and the date, in 12- or 24-hour format, in your own time zone or any other, with night mode and a world-clock row, that keeps the screen awake while it runs.
- Dog Food Calculator Find how much to feed your dog each day: resting energy from body weight, adjusted for age, neuter status, activity and weight goal, then grams or cups of your food from its calories per kilogram, split into meals.
- Sleep Calculator Find good times to go to bed or wake up in 90-minute sleep cycles, allowing for the time it takes you to fall asleep, see the hours of sleep each option gives against the recommendation for your age, and set an alarm.
- Steps to Distance Calculator Convert a step count to kilometres and miles using a stride length estimated from your height or measured yourself, estimate the calories it burned for your weight and pace, and go back from a distance to steps.
- Shoe Size Converter Convert shoe sizes between India, UK, US, EU, Japan and foot length in centimetres for men, women and children, or measure your foot and find your size, from a dated chart that says where brands differ.
- Screen Size Calculator Work out a screen's width, height and area from its diagonal and aspect ratio, compare two TVs or monitors, find the best size for your viewing distance, and see pixel density for a given resolution.
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