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73 calculators online
  New calculla released ! Please go to for the calculla v2. It's better, faster, more beautiful, redone for you in most modern technologies.
  Two cars related tables released today: Tire codes - speed ratings and Tire codes - load index
  This time 3 new calculators for fractions: Fractions: adding and subtracting, Fractions: 4 operations and Fractions: inverse (reciprocal). Each of them shows all sub-steps needed to compute common denominators, create improper fraction (if needed), reduce the fraction etc.
List of Calcullators (by family)
List of Calcullators (by type of operation)

Calcullators grid

namecompletiontype of usagefamily
ASCII-2-number converter++++
Add numbers (columnar addition)++
Bandwidthicon new++
Binary prefixesicon new++
Chinese zodiac+
Compound interesticon new+++
Cost of area++++
Cost of electricity+++
Data storage++
Deposit (investment)++
Fractions: 4 operationsicon new++
Fractions: adding and subtractingicon new++
Fractions: compareicon new++
Fractions: inverse (reciprocal)icon new++
HEX/DEC table++
IP calculator (networks/subnets)++
ISO 8859-2 (Latin-2) table+++
Is ID Number Correct++
MTU table++
Millionaire calculatoricon new++
Multiplication table++
Percentageicon new++
Polish OFE retirement+++
Polish ZUS retirement+++
Polish salary #1 (yearly)+++
Prime number++
Resistors color codesicon new++
SI prefixesicon new++
Speed (velocity)++
Tire codes - load indexicon new++
Tire codes - speed ratingsicon new++
Velocity-distance-timeicon new++
Volume (capacity)++
Polish "law interest"++
Polish "tax interest"++
Polish ZUS payments+++
Polish car travel in job+++
Polish court fees++
Polish earnings #2 (tax↔no tax)+++
Polish earnings #3 (written order)+++
Polish earnings during sickness+++
Polish investments amortization++
Polish notarial wages+++
Polish real property cost+++
Polish vacation days++
Polish work period+++
Adding days to dateicon beta++
Life timeicon beta++
Sleep timeicon beta+++
State pension ageicon beta+++
The difference between two datesicon beta++
Time to holidaysicon beta++
Time to new yearicon beta++
Time to school breakicon beta++
Time: Date and time formatsicon beta+++
Wedding anniversaryicon beta+++
Work timeicon beta+++
Zodiac signicon beta++
Full list of Calcullas (alphabetically)
  • ASCII-2-number converter
    The converter of any ASCII or Unicode text to numbers. Allows for many format-related modifications of output. Numbers can be hexadecimal, decimal or binary. Setting separators (commas, linebreaks), dividing numbers to groups (ex. put "enter" after each 4 items) - is also "one-click-easy". Supports windows/linux/mac line-break codes.
  • ASCII/HEX/HTML table
    The whole set of 127 ASCII characters. Table shows decimal(DEC), hexadecimal(HEX), octal(OCT) and binary(BIN) indexes, but also HTML entities (in 3 different formats), ANSI-C entities and ASCII descriptors.
  • Add numbers (columnar addition)
    Calculator to add numbers. It displays the sum of any given numbers. It also displays columnar addition of these numbers, the carrying (regrouping), partial sums etc. Can be useful for primary school students (learning how to do columnar addition), for financial operations (can be set up to display dollar/cent format) and... for any other addition related purpose.
  • Angle
    Angle units converter. Converts radians, degrees, turns and many more.
  • Area
    Area units converter. Converts square meters, square foots, acres, hectars and about 50 other units.
  • BMI
    Calculator for finding out the BMI (Body Mass Index). Just enter your height and weight. The result is the BMI factor itself, but also the interpretation of the factor by WHO description (are you starving? or are you overweight?). It accepts metric units (centimeters and kilograms) or US-like units (feets, inches and pounds).
  • Bandwidthicon new
    Bandwidth units converter. Converts KB/s, Mbps etc. All known units of bandwidth in two different bases: 1000 and 1024.
  • Binary prefixesicon new
    Binary prefixes - kibi, mebi, gibi, tebi etc.
  • Chinese zodiac
    Calculator for finding chinese zodiac sign. Just give your date of birth - then the calculator will find chinese zodiac sign and zodiac elemental.
  • Compound interesticon new
    Calculator forecasts future value of your money after applying inflation and/or rate of interest.
  • Cost of area
    The cost-of-area calculator. It finds the price for a piece of land/property/flat/floor, a cost of painting the wall, a quantity of seed you need to plant your lawn... The expenditure of anything that depends on area in many different units!
  • Cost of electricity
    Online calculator of electric energy cost. First you set the price for a 1kWh (one kilo-watt). Then you specify all the electric devices you use, and how much of time they are used daily. The calculator computes the yearly, montly and daily usage of an electric energy, and its overall cost... This can be used for household computation, but also for any business costs estimation.
  • Data storage
    Data units converter. Converts bits, bytes, megabytes, gigabytes itd. All known units of data in two different bases: 1000 and 1024. This calculator handles some less known data units: nibbles, octets, pixels (24/48-bit), words, quads, long-words etc.
  • Deposit (investment)
    Deposit income calculator. Takes your investment amount, nominal annual interest rate, deposit time and some more settings and calculates your income. Shows period-by-period income capitalization/compound.
  • Energy
    Energy units converter. Converts joules, calories, many physical, british, american and time related units.
  • Fractions
    Fraction explorer - it displays info related to given fraction. Simply enter a fraction and get equal proper fraction, improper (top-heavy) fraction and simplified fraction. Displays also numerator and denominator factors.
  • Fractions: 4 operationsicon new
    Calculations on fractions - it performs operations on two given fractions. Simply enter two fractions and get them added, subtracted, multiplied and divided by each other. You will get sum, difference, product and quotient of these two.
  • Fractions: adding and subtractingicon new
    Calculator shows how to add or subtract two fractions step by step. Simply enter two fractions, select add or subtract and get list of all partial steps needed to compute result. Train your math with calculla!
  • Fractions: compareicon new
    Calculator compares two fractions and tells you if they are equal or different. If given fractions are different, the calculator will let you know which one is greater, which one is smaller and what is the difference between them.
  • Fractions: inverse (reciprocal)icon new
    Calculator finds multiplicative inverse of given fraction or number.
  • GCD
    Greatest Common Divisor (GCD) calculator - solves GCD for given numbers, but also displays prime dividers (in a school-like way). So, you know how the solution is found. It can find the GCD for 3 numbers too !
  • HEX/DEC table
    Lookup table (4096 entries) for fast manual conversion of decimal to hex, or hex to decimal numbers.
  • IP calculator (networks/subnets)
    Online utility for IP address calculations including netmask, broadcast and network addresses, wildcard mask, usable ranges, address format conversion etc. Accepts IP-s in hex/dec and also as one unsigned int number.
  • ISO 8859-2 (Latin-2) table
    The whole set of ISO 8859-2 (Latin-2) characters. Table shows decimal(DEC), hexadecimal(HEX), octal(OCT) and binary(BIN) indexes, but also HTML entities (in 3 different formats), ANSI-C entities, unicode (HEX, OCT and DEC) and textual descriptors.
  • Is ID Number Correct
    The online calculator for checking correctness of ID numbers. It validates: IBAN (bank account number), EAN (article), ISBN (book), ISMN (music), ISSN (serial). Just enter the code (with or without any dots, spaces, slashes etc.) and in a moment you will know, if it is a valid code and which one of them.
  • LCM
    Least Common Multiple (LCM) calculator - finds LCM for up to three given numbers and shows process of dividing by primes as for school-like interpretation.
  • Length(size)
    Length units converter - converts units between kilometers, meters, decimeters, angstroms, miles, feet, inches, american/imperial units, nautical (sea) units and astronomical units
  • Loan
    Loan calculator - interest, monthly payments, principal part, one time fees. Amortizing and term loan considered.
  • MTU table
    MTU (Maximum Transmission Unit) values assigned to given network type.
  • Mass(weight)
    Mass(weight) units converter - converts units between metric(tons, kilograms, etc.), Avoirdupois/US(pounds, ounces) and troy systems
  • Millionaire calculatoricon new
    Calculator simulates raising your first million by systematic saving.
  • Momentum
    Online calculator for momentum. Computes values of momentum, mass or velocity using the momentum formula.
  • Multiplication table
    Multiplication table with changable size
  • Percentageicon new
    Calculator finds solutions to common percentage problems. It's done in easy way: more like stories and everyday situations, less like math language.
  • Polish OFE retirement
    Online calculator computes the pension received from both ZUS (polish retirement institution) and Open Retirement Funds.
  • Polish ZUS retirement
    This online calculator computes the amount of pension received from Polish retirement institution called ZUS.
  • Polish salary #1 (yearly)
    The take-home salary calculator for Poland. It takes your gross income and calculates all your take-home (netto) earnings month by month. It also displays all parts of salary: polish national insurance (ZUS), income taxes and other costs of working as an employee in Poland.
  • Power
    Power units converter. This calculator converts between horsepower, wats and over a dozen other power units.
  • Prime number
    Prime numbers and factors online calculator (really fast). Give it an integer number, and you got the answers: Is the number prime? If not, what are prime factors? What are results of dividing by prime factors ? What is next/previous prime number ? All of those questions answered here. Used computation method makes this prime number calculator one of the fastest in the web.
  • Resistors color codesicon new
    Calculator decodes parameters of resistor (resistance value, tolerance, temperature coefficient) painted as colored bands on resistor and vice versa.
  • SI prefixesicon new
    A metric units prefixes (SI prefixes).
  • Speed (velocity)
    Speed (velocity) units converter - converts units between metric (kilometres per hour, meters per second and many more), british-american (miles per hour, foot per second and many more), nautical (knots) and some other (machs, speed of light etc.)
  • Temperature
    Temperature units converter. Easy conversion of Kelvin, Celsius, Fahrenheit, Rankine and other temperature related (heat) units.
  • Tire codes - load indexicon new
    The table of tire load index codes. And also explanation of meaning of tire markings (bit by bit) with simple infographic.
  • Tire codes - speed ratingsicon new
    The table of tire speed rating codes. And also explanation of meaning of tire markings (bit by bit) with simple infographic.
  • VAT(tax)
    Online VAT tax calculator (VAT is Value Added Tax). Computes net amount, gross amount and tax value depending of given tax rate (handles VAT for many countries and goods types). Really simple tax calculator !
  • Velocity-distance-timeicon new
    Online calculator for velocity. Computes values of velocity, distance or time using the average velocity formula.
  • Volume (capacity)
    Converter of volume units (also capacity units). Supports 110+ different units used over the world. Gallons, litres, cubic meters, pints, barrels and 100+ other !
  • Polish "law interest"
    Polish "interest by law" online calculator.
  • Polish "tax interest"
    Polish "interest for late tax payment" online calculator.
  • Polish ZUS payments
    Online calculator for ZUS payments of a polish worker.
  • Polish car travel in job
    Online calculator for finding an amount of cash that can be repaid by an employer for using private car.
  • Polish court fees
    Online calculator computes cost (fees) of starting private case in Polish court.
  • Polish earnings #2 (tax↔no tax)
    The earnings, taxes and other costs of working as an employee in Poland. The easy conversion between brutto↔netto (tax↔no tax earnings).
  • Polish earnings #3 (written order)
    Written order taxation calculator (Polish tax system only). Easy calculation of costs, and taxes.
  • Polish earnings during sickness
    Calculator of the earnings in Poland during illness.
  • Polish investments amortization
    Polish investments amortization online calculator.
  • Polish notarial wages
    Polish notarial wages calculator.
  • Polish real property cost
    Property purchasing costs online calculator - polish only.
  • Polish vacation days
    Online calculator for calculating number of vacation days for every year of work in Poland.
  • Polish work period
    Calculator of the period of work in Poland, according to job acts.
  • Adding days to dateicon beta
    Calculator computes what day is after adding (or subtracking) given number of days to your date.
  • Life timeicon beta
    Calculator computes the number of years, months, days, hours, minutes and seconds, which have passed since your date of birth. In other words, it calculates how long you live.
  • Sleep timeicon beta
    Calculator computes the number of years, months, days, hours, minutes and seconds, which you slept during your life.
  • State pension ageicon beta
    Calculator checks when you can retire.
  • The difference between two datesicon beta
    Calculator computes how many days (hours, minutes, seconds) passed between two dates.
  • Time to holidaysicon beta
    Calculator computes how many days (hours, minutes, seconds) remained to coming holidays within next year.
  • Time to new yearicon beta
    Calculator computes how many days (hours, minutes, seconds) remained to celebrate new year.
  • Time to school breakicon beta
    Calculator computes how many days (hours, minutes, seconds) remained to coming holidays or the end of school year.
  • Time: Date and time formatsicon beta
    Calculator converts date and time from one format to another. Supports number of calendars (Julian, Islamic, Persian, Indian) and also computer time (UNIX time).
  • Wedding anniversaryicon beta
    Put in your wedding date and Calculla will show you list of your wedding anniversaries.
  • Work timeicon beta
    Calculator computes number of work hours in given period.
  • Zodiac signicon beta
    Calculator calculates what is your zodiac sign depending on your date of birth.