In this category you'll find more advanced (interactive) tools that are neither a simple table nor a converter. The characteristic feature of calculators is their **interactivity**. It means, that the result of the calculator depends on the data provided by the user. In this section you can for example calculate (simulate) how your deposit amount increases from year to year, how much electric energy is consumed by devices in your home, or how much taxes and insurance contributions you pay each month from your salary.

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.

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.

Calculator computes what day is after adding (or subtracting) given number of days, months or years to your date. It can exclude Saturdays, Sundays and country-specific holidays from computations.

Calculations related to Avogadro's law. Enter known values (e.g. volume or number of moles) and select which value you want to find out (e.g. molar volume) and we'll show you step-by-step how to transform basic formula and reach your result in desired units.

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).

This calculator finds out your sign in bird horoscope based on your birhdate. Check out what bird are you.

Calculator finds out boiling point under selected pressure using Clausius-Clapeyron's equation and reference data for given substance. For example, you can find out what is water's boiling point in high mountains, where the pressure is lower.

This calculator finds out tree sign assigned to your birth day by celtic horoscope. Check out what tree are you.

Calculator for finding chinese zodiac sign. Just give your date of birth - then the calculator will find chinese zodiac sign and zodiac elemental.

Calculations related to Clapeyron's equation known also as ideal gas law. Enter known values (e.g. pressure and temperature) and select which value you want to find out (e.g. volume) and we'll show you step-by-step how to transform basic formula and reach your result in desired units.

Calculator forecasts future value of your money after applying inflation and/or rate of interest.

Calculations finds out concentration (percentage or molar) of saturated solution based on substance solubility or vice versa.

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!

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.

Calculator computes how much time passed between two points in time. Accepts years, months, days, hours, minutes and seconds and computes the difference in friendly format.

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.

Common calculations related to disk (wheel, circle). Calculate circle's area or radius or circumference.

Calculator shows internal representation of IEEE 754 floating point numbers, as it is stored in computer's memory. You can see binary, hexadecimal and decimal dump of the number including split into sign, exponent and mantisa parts. Both single and double floating numbers are supported.

Calculator finds out your flower in flower horoscope. Check out what flower are you.

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.

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.

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!

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.

Calculator finds multiplicative inverse of given fraction or number.

Generates sound with specified frequency and waveform type (sine, triangle etc.).

Calculator helps you with common calculations related to fuel cost and consumption. You will find out how much you spend on fuel, what is the average fuel consumption of your vehicle, how much you will spend on the journey in your car or how much fuel you should refuel in order to reach the goal etc.

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 !

This calculator finds out your card (ace diamonds, seven spades etc.) in Gypsy horoscope. Check out what is your lucky card.

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.

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.

This calculator finds out your care number in Japanese horoscope based on your birth date.

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.

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.

Loan calculator - interest, monthly payments, principal part, one time fees. Amortizing and term loan considered.

Calculator simulates raising your first million by systematic saving.

Online calculator for momentum. Computes values of momentum, mass or velocity using the momentum formula.

This calculator finds out your moroccan horoscope sign based on given birthdate. Check out what is your body part.

Calculator computes average and median values from the list of numbers. Find average and median.

Calculator finds maximum and minimum from the list of numbers. Find min/max values.

Calculator accepts list of numbers and displays common statistics about them: average (mean), median, minimum, maximum etc. Summary information about your data series.

Current, voltage, resistance: calculations related to Ohm law. Enter known values (e.g. voltage and resistance of conductor) and we'll show you step-by-step how to transform basic formula and find out missing value (e.g. current)

Calculator computes cash amount, which polish taxpayers, should subtract from their tax to apply tax-free amount. This value is well-known as tax-decreasing amount.

Calculator finds solutions to common percentage problems. It's done in easy way: more like stories and everyday situations, less like math language.

Online calculator for finding the amount of cash that can be reimbursed (repaid) by an employer to employee for use of private car (in Poland, by Polish law).

Table shows average exchange rates for all currencies listed by the National Bank of Poland (NBP) for the selected day.

Polish "interest by law" online calculator.

Polish "interest for late tax payment" online calculator.

Online calculator computes the pension received from both ZUS (polish retirement institution) and Open Retirement Funds.

Calculator decodes given PESEL number (unique ID assigned to each person in Poland) and breaks it into date of birth (year, month, day), serial number, gender and checksum (control digit) parts. Just enter your PESEL and we'll show you what data is hidden inside it.

Calculator generates random PESEL numbers (unique ID assigned to each person in Poland) matching given criteria such as date of birth, age range or gender.

Online calculator for ZUS payments of a polish worker. For given gross earnings amount it computes all mandatory insurance contributions in Poland. It displays the part paid by the worker and also by the employer. All the values are given as Polish Zlotys and also as percentage.

This online calculator computes the amount of pension received from Polish retirement institution called ZUS.

This calculator finds out cost of using private car in job based on monthly flat-rate in Poland.

Online calculator computes cost (fees) of starting private case in Polish court.

The earnings, taxes and other costs of working as an employee in Poland. The easy conversion between brutto↔netto (tax↔no tax earnings).

Written order taxation calculator (Polish tax system only). Easy calculation of costs, and taxes. In Poland it is called "Umowa zlecenie".

Calculator of the earnings in Poland during illness.

Polish investments amortization online calculator.

Polish notarial wages calculator.

Property purchasing costs online calculator - polish only.

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.

The take-home amount calculator for B2B (Business to business, invoice based) contract. If you work (or going to work) as contractor in Poland, then this calculator helps you to calculate how much you will earn as self-employed.

Calculator finds out the daily allowance for international delegation in Polish business i.e. the so-called subsistence allowance. Calculator takes into acount both basic daily allowance rate for given country and overnight accommodation cost.

Calculator finds out the amount of cash available to the employee during national delegation (without travelling outside of Poland) i.e. the so-called subsistence allowance. Calculator takes into acount both basic daily allowance rate and hotel flat-rate.

Online calculator for finding number of vacation days in employment in Poland. The more years of work you have on your account, the more days of vacation you will have.

This calculator computes the qualifying period of employment (work) in Poland, according to polish employment law. You enter employment start and end dates, then this calculator will display a number of years, months and days of employment.

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.

Generates random numbers and texts. You can use this calculator to generate random passwords.

Calculator finds out when and how much money do you need to leave your job and become a rentier.

Calculator decodes parameters of the resistor (resistance value, tolerance, temperature coefficient) painted as colored bands on the resistor and vice versa.

This calculator finds out your fruit (gooseberry, pineapple etc.) in Roman horoscope, sometimes called also Apollonian. Check out what is your lucky fruit.

Calculator computes the number of years, months, days, hours, minutes and seconds, which you slept during your life.

Calculator checks how many years, months, days, hours, minutes and seconds are still left until the day of your retirement.

The stop watch online. Simply start the timer and catch your events with milisecond precision.

Calculator computes how many days (hours, minutes, seconds) remained to all coming holidays within next year. It can disable Saturdays, Sundays and also national holidays specific to country or area.

Calculator computes how many days (hours, minutes, seconds) remained to celebrate new year.

Calculator computes how many days (hours, minutes, seconds) are left to closest coming holidays or the end of school year.

Calculator finds out tire production date (year, weak and month) based on DOT index printed on your tire.

Enter two angles and this caltulator will compute third one for you.

Calculator for mileage expenses (business use of own car in UK). It calculates the "approved amount" that can be claimed tax-free by an employee for using their own car as business travel expenses.

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 !

Online calculator for velocity. Computes values of velocity, distance or time using the average velocity formula.

Convert volume to mass and vice versa. Using this calculator you can check what is the weight of a glass of water or what volume does kilogram of feathers occupy. Use the one of predefined substances (water, steal, wood etc.) or enter custom density in any unit (kg/m3, g/cm3, mg/l etc.)

The calculator finds out wavelength based on frequency and vice versa. It accepts wave velocity as input, so you can use it for various kinds of waves (sound, light etc.).

Put in your wedding date and Calculla will show you list of your wedding anniversaries.

Calculator finds out the number of words, characters, sentences, paragraphs, keywords density etc. in a given text.

Calculator computes number of work hours in given period.

Calculator calculates what is your zodiac sign depending on your date of birth.

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