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Everyday calculators

Practical comparisons for shopping, travel, cooking and time: the small calculations that add up.

Trip fuel costFuel and time for a journey, split between passengers.Unit price comparisonWhich pack is actually cheaper per unit.Recipe scalerRescales quantities and adjusts baking time.Aspect ratio & screen sizeResize while keeping proportions, or find screen dimensions.Pizza & round-item valueArea per dollar: the honest way to compare sizes.Reading & speaking timeHow long a word count takes to read aloud or silently.Password strengthEntropy in bits and how long a brute force would take.Coffee brew ratioGrounds and water for a chosen strength.Hours of work to buy somethingPrices a purchase in hours of your life.Words per minuteReading speed in words per minute, from a word count and the time it took to read.Words to speaking minutesHow long a word count takes to speak aloud, or the words needed for a target length.Weekly work hoursAdds up hours worked across a week from a daily figure, with an overtime threshold.Minutes in a dayHow many minutes are in a day, or in any number of days, hours or weeks.SubnetNetwork address, broadcast address and usable host range for an IPv4 address and CIDR prefix.Working days left in the yearWeekdays remaining from any date to 31 December that year, and the year's full working-day total.Day counterA running day count from a start date to today or any other date, framed as "Day N".Hours in a yearHow many hours are in a year, for a common, leap or average calendar year, or a number of years.Week Number CalculatorISO week number for any date, or the date range covered by a given week and year.Bold Text Generator (Unicode)Turns typed text into Unicode bold, italic or bold-italic characters that paste as real formatting anywhere.Fuel Consumption CalculatorWorks out your actual fuel consumption rate from a distance travelled and the fuel used, in L/100km, km/L and mpg.Date and time calculatorAdds or subtracts days, hours and minutes together from a single starting date and time.Date duration calculatorThe gap between two dates expressed as a single total in years, months, weeks and days at once.Day of the year calculatorWhich numbered day of the year, from 1 to 365 or 366, any date falls on.Superscript GeneratorTurns typed text into Unicode superscript characters, for exponents, footnotes and ordinal-style text.What Year Will It Be CalculatorThe calendar year a chosen number of years and months from any starting date.Nether Portal CalculatorOverworld to Nether coordinates and back, using the fixed 8:1 ratio.Aspect Ratio (16:9 & more)Matching width or height for a target ratio like 16:9, or the simplified ratio of two sizes.Business Days in a MonthCounts the weekdays in any calendar month, minus any public holidays that fall on one.Pig Latin TranslatorTranslates English text into Pig Latin, moving each word's leading consonants to the end and adding "ay".Wedding Anniversary CalculatorYears married, the traditional gift for that anniversary year, and days until the next one, from a wedding date.Shoe Size ConverterConverts a shoe size between US, UK and EU sizing for men's or women's shoes.Upside-Down Text GeneratorFlips typed text into upside-down Unicode characters, reversed to read correctly when inverted.Small Text GeneratorTurns typed text into small Unicode capital letters that paste as smaller-looking text anywhere.Title Case ConverterCapitalises a piece of text into title case, following the AP style rule of lower-casing minor words except at the start or end.Electricity Bill CalculatorEstimates a power bill from usage in kWh, your rate per kWh, and any fixed daily supply charge.Months Between Two DatesWhole months and remaining days between two dates, plus the total as a decimal.Circle Skirt CalculatorFabric radius needed for a full, half or other fraction circle skirt from waist and skirt length.RAID CalculatorUsable storage capacity and fault tolerance for RAID 0, 1, 5, 6 and 10 arrays.Travelling Time by CarDriving time from distance and average speed, plus an allowance for traffic and stops.D&D 5e Point Buy CalculatorSpends a 27-point budget on the six D&D 5e ability scores, using the official fixed cost table.Jeans Size CalculatorConverts a US jeans size to UK, EU and waist measurement, for men's or women's cuts.Birth Year CalculatorWorks out the possible birth year for someone at a given current age, as a range of two years.Subscript GeneratorTurns typed text into Unicode subscript characters, for chemical formulas and footnote indices.Check Expiry Date CalculatorWorks out the expiry date from a purchase date and shelf life, and how many days remain.Hair Grow in Month CalculatorTotal hair growth over a number of months at a chosen, editable monthly growth rate.Vocal Range CalculatorClassifies a voice type, bass to soprano, from a lowest and highest comfortable note.eDPI (Effective DPI)Mouse DPI multiplied by in-game sensitivity, the number used to compare sensitivity across games and mice.Calendar CalculatorDay of the week, ISO week number, quarter and day of year for any date.Age Difference CalculatorYears, months and days between two people's dates of birth, and who is older.Elapsed Time CalculatorElapsed time between a start date and time and an end date and time, in days, hours, minutes and seconds.Hair Length Chart CalculatorMatches a hair length in inches or cm to the closest category on a standard hair-length chart.Mayan Calendar ConverterConverts a Gregorian date to the Mayan Long Count, Tzolkin and Haab calendar dates, using the standard GMT correlation.Cursive Writing GeneratorTurns typed text into Unicode cursive-style mathematical script characters that paste as styled text anywhere.Hours in a Week CalculatorHow many hours are in a week, or any chosen number of weeks, from the fixed 168-hour week.US Coin Value CalculatorTotal dollar value from a count of US pennies, nickels, dimes, quarters, half-dollars and dollar coins.Caesar Cipher CalculatorEncodes or decodes text with a Caesar shift cipher, or tries all 25 shifts when the shift is unknown.Case Sensitive Text ComparisonCompares two pieces of text and shows whether they match case-sensitively and case-insensitively.Add Time CalculatorAdds two or more time durations together (hours, minutes and seconds) to get a combined total duration.Watts to Watt Hours CalculatorConverts power in watts and a running time into energy used in watt-hours and kilowatt-hours, with an optional cost estimate.Baby Age CalculatorA baby or infant’s current age in weeks and months from their date of birth, not just years.Ring Size ConverterConverts between US/Canada ring sizes, UK/Australian letter sizes, EU sizes and finger circumference or diameter.Korean ageTraditional Korean age from a birth year, and the difference from international age.Fish Tank Gallons to LitresConverts a fish tank size between US gallons and litres, either direction, using the exact 3.78541 L per US gallon factor.TV Mounting HeightThe recommended height for the centre of a TV screen above the floor, based on seated eye level.Poker Hand StrengthRanks a 5-card poker hand into its standard category, from high card up to a royal flush.Years Between Two DatesThe span between two dates expressed as decimal years, plus the whole-years-and-days breakdown.Battery charge timeHow long a device takes to charge from its current level to a target level.Typing speed (WPM)Gross and net words per minute, and accuracy, from a timed typing sample.Luggage linear inchesChecks a bag against an airline’s combined length + width + height limit.Cost of a meetingWhat a meeting actually costs in attendee salary time.True cost per mile to driveAll-in running cost of a vehicle, spread across the miles driven.Weight of a pile of cashHow much a dollar amount weighs in bills or coins.2-stroke fuel mix ratioOil to add to a volume of petrol for a chosen mix ratio.Generator sizingGenerator capacity needed to cover a set of appliances, including starting surge.LED bulb savingsElectricity and replacement-bulb savings from switching to LED lighting.Event tables & seatingTables needed for a guest count, for round or rectangular tables.Pomodoro session plannerHow many focused work intervals a task will take, breaks included.Money saved by quitting smokingWhat not buying cigarettes adds up to over time.Roll length remainingHow much material is left on a roll, from its diameter and material thickness.Cost of a showerWater and water-heating energy cost for one shower.EV home charging cost & timeCost and time to charge an electric vehicle from one charge level to another.Binge-watch time plannerTotal time to finish a TV series, and how many days that takes.Moon phase finderThe approximate Moon phase on any date, from the lunar synodic cycle.Weighted blanket sizeRecommended blanket weight from body weight, using the common 10% rule.Mobile data usageDaily and monthly data use from your everyday activities, and how long a data cap will last.Gold Weight CalculatorWeight of a gold item from its volume and karat purity, with density editable for custom alloys.Morse Code TranslatorConverts text to Morse code or Morse code back to text, covering letters A-Z and digits 0-9.Half Birthday CalculatorThe date exactly six months after (or before) a birth date, and how many days until it next falls.TV Size CalculatorRecommended TV screen size from viewing distance, or recommended viewing distance from screen size.Tie Length CalculatorRecommended necktie length for a given height, using standard, short and long/XL sizing bands.Dilution Ratio CalculatorConcentrate and water needed for a mixing ratio such as 1:10, from the total volume you need to make up.Paving cost estimateEstimated material and labour cost to pave an area, from your own price and waste inputs.Playback SpeedNew watch time and time saved when a video or audio track is played faster or slower.Weeks Left in the Australian Financial YearWeeks and days remaining until 30 June, the end of the Australian financial year.KD (Kill/Death) Ratio CalculatorKill/death ratio from a kill count and a death count, the core gaming performance stat.Age From Birth Year CalculatorCurrent age from a birth year alone, as a range of two possible ages.Steps to weight lossEstimated calories burned from a daily step count, and the resulting weight change over a chosen period.Carpool cost sharingSplits a shared commute's fuel cost fairly among riders.Commute cost & time comparisonCompares driving to public transit for a regular commute, in cost and time.Toilet paper: how long a pack lastsHow many days a pack of toilet roll lasts a household, from usage per person.Firewood needed for the seasonHow many cords of firewood a heating season needs, from stove burn rate and heating days.Tire size & speedometer differenceOverall diameter, circumference and speedometer error between two tire sizes.Crosswind & headwind componentSplits a wind reading into the part blowing across your path and the part blowing along it.Packing boxes estimateHow many moving boxes a household will need, from room count plus kitchen and fragile items.Belt sizeBelt size to buy from a waist measurement, using the standard buckle allowance.Standing desk heightStanding desk surface height from your height, using the elbow-height ergonomic ratio.Screen viewing distanceRecommended seating distance from a screen size and target field of view.Sunscreen amountSunscreen to apply per full-body application, from the dermatology 2 mg/cm² rule.Hammock hang angleRidgeline length and hang-point drop for a comfortable hammock sag between two anchors.Engine compression ratioStatic compression ratio for an engine cylinder from bore, stroke and clearance volume.Cross-stitch fabric sizeFabric size to buy for a cross-stitch pattern, from stitch count, fabric count and margin.Bean bag fillingFiller needed for a bean bag chair from its filled dimensions, using the standard bead density.Clay shrinkageFired size of a clay piece after drying and firing shrinkage, from its wet (greenware) size.Sidereal timeLocal sidereal time for a date, UTC time and longitude, the star clock astronomers use.Balloon arch balloon countBalloons needed for a single-row or garland balloon arch from its size and balloon diameter.Cost per minuteBreaks a total cost down to a rate per minute, for calls, rentals, or metered time.Price per weightUnit price of an item by weight, so you can compare packages sold in different sizes or units.Tablecloth sizeTablecloth dimensions needed for a table, from its size and how far you want the drop.Curtain fabric neededFabric width and panel count for curtains, from window size and desired fullness.Pool salt neededHow much salt to add to a saltwater pool to reach a target concentration.Bath vs. shower water useCompares the water used filling a bath against taking a shower of a given length.Hat sizeHat size number from head circumference, plus the letter size.Glove sizeGlove size number and letter size from a hand circumference measurement.Paper sheet & ream weightWeight of a sheet or a stack of paper from its GSM and dimensions.Helium balloon liftHow many balloons of a given size are needed to lift a payload.Winch sizeRecommended winch pulling capacity from vehicle weight and a safety factor.Lumens to wattsPower draw needed for a target brightness, by bulb technology.Event tent sizeFloor area and footprint needed for a party or event tent, by seating style.Toothpaste tube lifeHow many days a toothpaste tube lasts a household, from tube size and brushing habits.Days until ChristmasA countdown to the next 25 December, worked out from any starting date.Days in a year or monthHow many days are in any year or month, with the leap year worked out for you.Anniversary calculatorYears, months and days since an anniversary date, and when the next one falls.Date calculatorAdd or subtract days, weeks, months or years from any date.Hours calculatorHours and minutes between two clock times, including overnight spans.Days calculatorHow many days between two dates, counted either way.Time between datesFull breakdown of years, months, weeks and days between two dates.Difference between two numbersAbsolute difference, percentage difference and percentage change between two numbers.Months calculatorWhole months and remaining days between two dates, or a set number of months between them.Weeks in a monthHow many calendar weeks a given month spans, based on its day count and starting weekday.Leap year checkerWhether any given year is a leap year, using the 4/100/400 rule, plus the nearest leap years either side.Days until a dateHow many days from today until any target date you enter, or how many days have passed if it is behind you.Weeks between two datesWhole weeks and remaining days between two dates, plus the total as a decimal.Days till Christmas in AustraliaA countdown to the next 25 December, with the Australian summer Christmas context.

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