## 2019.04.25: Calculla Finally on secure https connection

We finally converted Calculla to secure website. We are now using https. No more annoying "Not secure" notifications from the browser.

Hopefully, everything is still working as before for you !

Technicals: We used Free Certificates from Let's Encrypt.## 2018.06.20: More calculators related to time

We've just published another 2 new calculators related to time:

- Time to holidays - find how many days (hours, minutes, seconds) left to incoming holidays - where few next holidays are shown

- Work time - computes number of work hours in given period.

## 2018.06.19: State pension age calculator

Various countries have different rules of when you can go for state pension, to retire officially.

We gathered data for many countries and created a new calculator of retirement date.

You simply enter your date of birth and select the country and the calculator will tell you what is the date of your retirement.

It shows you also comparison between different countries.## 2018.06.18: Zodiac sign calculator

We just published new calculator of zodiac sign. Just enter your date of birth - and you have you zodiac sign displayed.

As the number of this type of calculators is growing, we've also created new category of calculators - esotericism/numerology.

## 2018.05.14: 2 new calculators related to time

We've just published 2 new calculators related to time:

## 2018.03.29: New table: the TeX/LaTeX cheat sheet

We introduced a lot of math formulas into Calculla's text recently. Writing math formulas with TeX/LaTeX is obvious and standard way of doing that.

To help ourselves and anyone else using TeX/LaTeX we made a Quick TeX cheat sheet.## 2018.03.14: Greek letters

We do a lot of math TeX notation recently. And also HTML math entities notation. For math and physics a lot of greek letters are normally used, so we made a Table of Greek alphabet with TeX and HTML entities.## 2018.02.15: The time: 4 new time calculators

Today, main topic **The Time**... We've finished 4 different calculators related to time:

## 2017.09.30: Tires once again: DOT codes

One more new calculator related to tires, to make all the tire related stuff complete - the Tire production date (DOT index) calculator released !## 2017.02.01: New calculator: fuel consumption

Two new calculators finished, both related to fuel consumption of a car, bike, truck, lorry etc. Take a look at Fuel consumption and Fuel consumption units## 2017.01.08: Calculla 2.0 released

New Calculla Released ! The version 2 of calculla.com has been finished and published. We still have few improvements to do, but the site is already a lot better than old calculla.

More about it here: About new calculla## 2015.04.06: New math math stuff: more fractions calculators

This time 3 new calculators for fractions: Fractions: add and subtract step by step, 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.## 2015.03.29: Simple and useful: percents calculator

You love it or you hate it. You understand it or don't have a clue. Percents, percentage is a powerful tool to say about part of something. We made the Percentage calculator to make your life easier.## 2015.03.11: New simulation: compound interest

New calculator of Compound Interest: It computes the future value of your deposit/investment assuming any interest you'll get every year, you'll just add to existing capital. This way the "compount interest" is being created. This calculator has a little bit similar idea to When I'll be Millionaire calculator we released couple of weeks ago. ## 2015.02.21: If I were a rich man: millionaire calculator

New calculator in finance section, but less serious this time: The Millionaire Calculator. We wish you to gather your first million quick&fast, doesn't matter if the million comes with Dollars, Euros, Pounds or Zlotys (hopefully not Zimbabwe Dollars).## 2015.02.07: News for nerds: IP calculator is JS based now

Update: The IP subnets Calculator has been rewritten ! This was the last old-tech calculator done in server-side. Now it's pure client-side - no more website reloads, so works faster !## 2015.01.18: calculla is celebrating: 50 calculators released

We've released two simple tables with unit prefixes (like kilo, mega, micro, etc.): the SI prefixes table and similar one for IT purposes the binary prefixes table.

Also one more IT calculator added: calculator of bandwidth (internet connection bandwidth) - it supports even exotic units of bandwidth like peta-bytes per day.

A small celebration for us: we've just crossed 50 working calculators ! Next milestone is 100 - stay with us !## 2009.06.22: Verification of identification codes

Codes used for banking (IBAN), serial numbers (ISSN), EAN, ISBN, etc. can be easily checked, if they are provided without of mistake. We made the calculator for veryfing these codes: online verifyier of identification codes.## 2008.12.18: New calculator: columnar addition

We made something simple (simple, but very useful): Addition calculator. Displays results as for primary school - in columns (columnar addition). Small trick: it can extract numbers from given text !## 2008.11.30: New converter: angle units

A little bit of geometry: Angle units converter. Degree, radian, mil and more...## 2008.11.27: New calculator: loan

Financial one: Loan calc. The worst thing for a loan - it's always hard to pay off the one than to raise it.## 2008.11.24: New converter: power units

Power units converter is ready. Converts watts, horsepower, calorie per second and many more...## 2008.11.19: Something for nerds: ascii-2-hex converter

Computer related tool ascii-2-hex converter added to site. Allows for conversion of given text into numbers - includes many formatting options.## 2008.07.10: New converter: temperature units

The units of temperature converter is online now. Converts easily Kelvin, Celsius, Fahrenheit and some more.## 2008.06.03: New math calculator: greatest common divisor

One more math problem - a Greatest Common Divisor calculator. Solves GCD for given numbers, but also displays prime dividers (in a school-like way). And it takes up to **three numbers** !## 2008.05.27: Some math fun: prime number calculator

Now a math problem solve - a prime number calculator. Tells you if the number is prime. If not, what are prime factors? What are results of dividing by prime factors ? What is next/previous prime number ? All of those answered here.## 2008.05.20: New converter: energy units

Energy units converter done. Converts joules, calories, many physical, british, american and time related units!## 2008.05.19: New converter: area units

Area units converter ready. Converts square meters, square foots, acres, hectars and about 50 other units!## 2008.05.09: New calculator: VAT tax

Taxes - everybody like taxes ;) The VAT calculator is ready to convert net/gross prices for you, as well as computing the tax value itself.## 2008.05.05: New converter: speed units

Speed Converter is completed now ! Miles per hour, kilometeres per second, machs, knots - and much more... Ready !## 2008.04.04: News system started

News system started. All changes/improvements on site will be notified here.## 2008.04.03: New converter: length units

The length units converter is ready. It is able to convert the length in more than 20 different units.**JavaScript failed !**

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