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• Age Calculator

  Find your exact age in years, months and days, and how long until your next birthday.

• Date Difference

  Count the days, weeks and months between any two dates.

• Days Until

  How many days are left until a holiday, a deadline or any future date.

• Business Days

  Count business days between dates, or find when a deadline in working days lands.

• Time Zone Converter

  What time is it there, and what time will your meeting be for them.

• Moon Phases

  Today’s phase and the exact times of every new and full moon, in your time zone.

• Sunrise & Sunset

  Sunrise, sunset, twilight and day length for your location or any major city.

• BMI Calculator

  Body mass index from your height and weight, with the range it falls in.

• Calorie Calculator

  Estimated daily energy use from the Mifflin-St Jeor equation, with its margin.

• Ovulation Calculator

  Estimated fertile window and ovulation day from your cycle length.

• Due Date Calculator

  Estimated due date, gestational age and trimester, adjusted for your cycle.

• New

  Sleep Calculator

  Bedtimes from your alarm, or wake-up times from your bedtime, in whole sleep cycles.

• Fraction Calculator

  Add, subtract, multiply and divide fractions: exactly, never rounded.

• Proportion Calculator

  Solve a proportion, including the inverse case the usual formula gets wrong.

• Roman Numeral Converter

  Turn any number from 1 to 3999 into Roman numerals, and see how it is built.

• Roman Numerals to Numbers

  Read any Roman numeral, and get told when what you typed is not one.

• New

  Number to Words

  Any number or dollar amount in words, the way it goes on a check.

• Random Number Generator

  Draw numbers in any range, with or without repeats, and without the bias most generators have.

• Random Name Picker

  Paste a list and draw a winner, or shuffle the whole list into a fair order.

• Coin Flip

  Flip once to decide, or a hundred times to watch the halves even out.

• Dice Roller

  Roll any dice, from d4 to d100, plus the total for when the game needs it.

• Random Number 1 to 100

  The most asked range, already filled in: draw one number or a hundred.

• Equinox and Solstice

  When each season starts, to the minute, and why the date moves.

• Week Number

  Which week of the year a date falls in, and the week it belongs to.

• Day of the Year

  The sequential day number, how many remain, and how much of the year has passed.

• Ethanol or Gasoline

  Which fuel pays off at today’s prices, for your car.

• Loan Calculator

  Monthly payment, total interest and the full amortisation schedule.

• Compound Interest

  See how an amount grows over time, month by month, with regular contributions.

• Simple Interest

  Interest charged only on the original amount, with no interest on interest.

• Lunar Eclipse

  Every lunar eclipse to come, with the exact time in your own time zone.

• Countdown Timer

  A live countdown to any date: days, hours, minutes and seconds, ticking.

• Time Calculator

  Add hours and minutes, or find the time between two clock times.

• Hours Between Two Times

  How long from clock-in to clock-out, with the break taken off (night shifts included).

• Add and Subtract Time

  Add up durations in hours and minutes: the sum an ordinary calculator gets wrong.

• What Time Will It Be

  The time a set number of hours or minutes from now, past midnight if it goes there.

• Percentage Calculator

  What is X% of Y: the everyday percentage, worked out step by step.

• Percentage Increase

  Add a percentage to a value, or find the increase between two numbers.

• Discount Calculator

  The price after a discount, and the price before it, from the sale tag.

• Tip Calculator

  The tip, the total and what each person owes (including the cent that does not divide).

• Percentage Difference

  How far apart two values are, with neither one as the reference.

• Percentage of a Total

  X is what percent of Y: the share one number is of another.

• Length Converter

  Centimeters to inches, meters to feet, kilometers to miles.

• Weight Converter

  Kilograms to pounds, grams to ounces, and back again.

• Temperature Converter

  Celsius to Fahrenheit and Kelvin, with the offset done right.

• Area Converter

  Square meters, square feet, hectares and acres.

• Volume Converter

  Liters to gallons, milliliters to fluid ounces.

• Word Counter

  Words, characters, sentences and reading time, counted as you type.

• Character Counter

  Characters with and without spaces, against the X and meta description limits.

• New

  Password Generator

  Strong random passwords, with the exact entropy and how long they would take to crack.