Fast calculators, converters, random pickers, timers, and tests. No account required.
Example prices: a 750 g coffee pack at $24.00 costs $18.00 after 25% off. That is $24.00 per kg; a 1 kg pack at $26.00 costs more per kg. Product A is about 7.69% cheaper per unit. Enter both quantities in kilograms and include charges you actually pay.
09:00–17:30 with a 45-minute unpaid break gives 7 hours 45 minutes, or 7.75 decimal hours. Enter 7.75 on a decimal timesheet, not 7.45. Check overnight shifts and your employer’s rounding rules.
Example prices: 12.5 km/L equals 8 L/100 km. For 300 km at $1.80 per liter, estimate 24 liters costing $43.20. Check US versus imperial MPG. These are sample prices, not current fuel quotes; traffic and driving change actual use.
Calculate expressions with parentheses, powers, roots, logarithms, and trigonometry in degrees or radians.
Convert a date and time between world time zones or compare current times with a live world clock.
Split group expenses equally and calculate who pays whom after accounting for everyone’s contributions.
Compare two texts line by line and highlight additions, deletions, and unchanged lines locally in your browser.
Find the non-negative remainder and integer quotient when one whole number is divided by another.
Raise a finite number to an integer power, including zero and negative exponents.
Convert whole numbers between binary, octal, decimal, hexadecimal, and any base from 2 to 36.
Convert whole numbers from 1 to 3,999 to standard Roman numerals and back.
Calculate X% of a number, what percent one value is of another, and the percentage change between an old and a new value.
Find the saving and final price from an original price and a percentage discount, including stacked offers applied one after another.
Calculate age in completed years on any date, with the total days lived and the days remaining until the next birthday.
Count the exact days between two dates, with the gap also shown in weeks and approximate months, including leap years and past dates.
Calculate the elapsed hours and minutes between two clock times, including overnight spans that finish after midnight.
Calculate adult body mass index from weight and height in metric or imperial units, with the matching adult reference category.
Calculate a tip from the bill and a percentage, then see the total and an even per-person share for any group size.
Estimate the fixed monthly payment, total repaid and total interest for a loan from the amount, annual interest rate and term.
Project the future value of savings with compound interest and regular contributions, separating the money you put in from the growth.
Estimate the fuel a trip needs and what it costs, from the distance, the efficiency in L/100 km, km/L or US MPG, and the price per liter.
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles using exact international factors.
Convert between milligrams, grams, kilograms, ounces, pounds and stones using exact international mass factors.
Convert temperatures between Celsius, Fahrenheit and Kelvin, including oven settings, body temperature and scientific values.
Convert between square meters, square kilometers, square feet, acres and hectares using exact area factors.
Convert between milliliters, liters, cubic meters, fluid ounces, cups, pints and gallons using US customary definitions.
Convert speeds between kilometers per hour, miles per hour, meters per second and knots.
Convert between decimal and binary storage units: bytes, KB, MB, GB, TB and their KiB, MiB, GiB, TiB counterparts.
Convert kitchen measures by volume: teaspoons, tablespoons, cups, milliliters and liters, using US customary sizes.
Spin a wheel to pick one item fairly from a list you type, one option per line.
Pick one or more random names from a pasted list, drawn without replacement.
Generate random whole numbers in a range you choose, in any quantity, with or without duplicates.
Flip a virtual coin once or run thousands of flips at a time and see the running totals.
Shuffle a list of names into random teams whose sizes never differ by more than one person.
Run a countdown timer in your browser with an alert at zero and an optional repeat.
Time anything in your browser with start, pause, resume, reset and a list of lap times.
Alternate focus sessions with short breaks and take a longer break after every fourth session.
See how much time is left until a date and time you choose, updated continuously.
Measure your typing speed in words per minute, with accuracy and character counts.
Measure your reaction time over several attempts and take the median as your score.
Measure how many times you can click per second over a duration you choose.
Find the average, sum, count, minimum and maximum of a list of numbers pasted in any common layout.
Simplify a ratio to its smallest whole numbers, including ratios with decimals or a zero part, and check equivalent ratios.
Add, subtract, multiply or divide two fractions and see the result reduced to lowest terms with its decimal value.
Calculate sales tax and the final price from a pre-tax amount and any combined tax rate, in any currency.
Calculate profit, profit margin and markup from the cost and the selling price, including losses when the cost is higher.
Turn points earned and points possible into a percentage grade, with a letter grade on a simple 90/80/70/60 scale.
Calculate running pace per kilometer or mile and average speed from a distance and an elapsed time.
Calculate worked time between a clock-in and a clock-out after subtracting an unpaid break, in hours and minutes and in decimal hours.
Calculate the area of a rectangular space in square feet or square meters, with the result shown in both units.
Compare packages by calculating the price per item, per kilogram or per any unit you choose.
Convert pressure between pascals, kilopascals, bars, PSI, atmospheres and millimeters of mercury.
Convert energy between joules, calories, watt-hours, kilowatt-hours and British thermal units.
Convert power between watts, kilowatts, megawatts and mechanical horsepower.
Convert force between newtons, kilonewtons, pound-force and kilogram-force.
Convert angles between degrees, radians, gradians and turns for maths, code and drawings.
Convert time between milliseconds, seconds, minutes, hours, days, weeks and years with fixed factors.
Roll one or more virtual dice with any number of sides and see each die and the total.
Generate a strong random password in your browser, choosing the length and which character sets to include.
Shuffle a pasted list so every item appears exactly once in a random order.
Count words, characters, sentences and lines as you type, with a reading-time estimate.
Count characters with and without spaces as you type, along with words, sentences and lines.
Convert text to uppercase, lowercase, title case or sentence case without touching punctuation or spacing.
Remove repeated lines from a pasted list while keeping the first occurrence in its original position.
Sort pasted lines alphabetically in ascending or descending order, with natural number ordering.
Trim every line, collapse runs of spaces and tabs into one space, and optionally drop blank lines.
Find the median of a list of numbers, with the middle values used and the count, for data that contains outliers.
Find the most frequent value or values in a list of numbers, with the highest frequency and the count.
Calculate the population and sample standard deviation of a list of numbers, together with the mean and the count.
Convert a fraction into a decimal and a percentage by dividing the numerator by the denominator.
Convert a decimal into a simplified fraction, with a maximum denominator you choose for exact values or close approximations.
Find the greatest common divisor and the least common multiple of two or more whole numbers.
Check whether a whole number is prime, and see its smallest divisor when it is not.
Solve ax² + bx + c = 0 with the quadratic formula, including repeated roots and complex conjugate pairs.
Find a missing side of a right triangle with a² + b² = c², choosing whether to calculate the hypotenuse or a leg.
Calculate the diameter, circumference and area of a circle from its radius, with full precision for π.
Calculate the area of a triangle from a base and perpendicular height, or from three known sides with Heron’s formula.
Turn favorable and total outcomes into a probability, a percentage and the odds for the event.
Count how many ways r items can be chosen from n, as combinations when order does not matter and permutations when it does.
Calculate simple interest and the final amount from a principal, an annual rate and a time in years, with no compounding.
Estimate how many months of monthly saving and interest it takes to reach a savings target, and the balance when you get there.
Calculate the gain or loss on an investment and the return on investment as a percentage of what you put in.
Work out how many units you need to sell to cover fixed and variable costs, and the revenue that volume brings in.
Convert fuel economy between L/100 km, km/L, US MPG and imperial MPG, in the right direction each time.
Reverse text by characters or reverse the order of the words, entirely inside your browser.
Replace every occurrence of a phrase with another, with optional case-sensitive matching.
Turn an hourly wage into weekly, monthly and annual gross pay, with paid weeks and part-time hours taken into account.
Calculate regular pay, overtime pay and total gross earnings from an hourly wage, split hours and an overtime multiplier.
Add up a weekly time card from daily clock-in, clock-out and break times, with weekly overtime and gross pay when you enter a wage.
Convert hours and minutes into decimal hours and total minutes for timesheets, payroll and invoicing.
Add VAT to a net price or remove it from a tax-inclusive price, using any percentage rate.
Calculate sales commission at a flat percentage rate and the total earnings once base pay is added.
Estimate the monthly principal-and-interest payment on a mortgage, plus the total repaid and the total interest.
Calculate a credit-weighted GPA on a 4.0 scale from letter grades, one course per line.
Add or subtract days, weeks, months or years from any calendar date and see the resulting weekday and date.
Count the weekdays between two dates, with the option to include or exclude the final day.
Find the day of the week for any calendar date, past or future, shown in your language.
Estimate how much electricity an appliance uses and what it costs, from its wattage, daily runtime and your price per kWh.
Estimate how much paint a room needs from its dimensions, the area of doors and windows, the coverage on the tin and the number of coats.
Estimate the volume of concrete a slab, path or footing needs, in cubic meters, cubic feet and cubic yards.
Scale an ingredient amount from the servings a recipe was written for to the number of servings you actually want.
Convert linear acceleration between meters per second squared, feet per second squared and standard gravity.
Convert torque between newton-meters, pound-feet, pound-inches and kilogram-force meters.
Convert frequency between hertz, kilohertz, megahertz, gigahertz and revolutions per minute.
Convert density between kilograms per cubic meter, grams per cubic centimeter and imperial density units.
Convert data rates between bits and bytes per second, from kbps and Mbps to KB/s, MB/s and Gbps.
Get an unbiased random Yes or No answer, generated in your browser at the press of a button.
Pick one or more random calendar dates from a range you choose, with both end dates included.
Generate random letters in uppercase, lowercase or mixed case, with an option to avoid repeats.
Count how often each word appears in pasted text and rank the results, most frequent first.
Set a browser alarm for a local time of your choice, with an optional label.
Generate time-based authentication codes locally from your own Base32 setup key.