## 2020.01.04: New calculator: add or subtract days to date

One more calculator related to time and dates: Add or subtract days/months/years to date. What date is 1000 days from now ? What day was 1000 days before today excluding weekends ? This calculator answers those questions.## 2020.01.03: New calculator: Sleep time

Sleeping is a major "activity" taking huge part of your life. We finished time spent sleeping calculator which helps finding out the statistics of your sleep - like how many hours you did sleep starting from your birth.## 2019.08.15: New calculator: Number base converter

We finally tested Numeral systems well enough, to say it's no longer in beta tests. So, yeah, officially Numeral systems has been released today!## 2019.07.27: Calculla on Discord - quick chat

We respond to many emails about internals of our calculators, bugs in their implementation, requests to add some functionalities and much more. We thought it's gonna be easier if we have more rapid way of communication with Calculla users.We created Discord channel for Calculla - join us!

At the moment - that's just a test. We're going to find out if it really works for us and if it really helps keeping touch with Calculla guests.

Let us know if you like it...

## 2019.04.26: New calculator: LOGARITHM BASE CONVERTER

Just released new calculator for Logarithm base change - logarithm is pure math of course, but the main purpose of that calculator is for more general science.## 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:- Life time - how many days/hours/minutes have you lived ?
- Wedding anniversary - when is your next wedding anniversary and how is it called ?

## 2018.03.30: New Table: Ranges of electromagnetic waves

We just added new table : Electromagnetic waves## 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.

## 2018.03.25: Four new math tables added

We're speeding up with our new TeX/KaTeX usage. Just introduced 4 new tables: Trigonometric functions, Trigonometric reduction formulas, Derivative formulas and Integrals - formulas## 2018.03.24: New tables: Substance density and specific heat

New tables about substance properties: Density of substances and Specific heat of substances## 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:

- Got a Time formats converter - accepts date in many formats and many calendars. 2018-01-30 or 18/30/01 or 20180130 or Islamic or Persian calendar. Even something for geeks: the UNIX timestamp.
- The How much time between two dates (two different points in time) - you enter two dates and this calculator finds the number of days between those dates. It can skip public holidays, weekends etc. - all configurable.
- The Time (days) to New Year - how many days until we celebrate the New Year ?
- The Time (days) to school break - how many days until we are free from school ?

## 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 !## 2017.08.24: New table: polish IKE limits

New table: the annual limits for Polish 3rd pillar retirement pension: Polish retirement pension limits IKE/IKZE## 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

## 2015.08.25: Something for drivers: tires index

Two cars related tables released today: Tyres codes - speed ratings and Tyres codes - load index## 2015.07.30: New math tool: fractions comparator

Just one more fractions calculator - Fractions compare calculator: the easiest way to compare fractions## 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).## 2015.02.14: For electronics: resistor colors

New calculator for electronic engineering: Resistor colors calculator.## 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 !

## 2015.01.14: New physics tool: velocity-distance-time calculator

The new simple physics tool: calculator of velocity-distance-time formula. We also extended Data Storage Units calculator to include some common storage media (CD/DVD).## 2015.01.11: Something for nerds: MTU table

We've created a quick-reference MTU values table.## 2011.03.20: Something for astrology: chinese zodiac

Now something for astrology - the Chinese zodiac calculator## 2009.06.27: BMI - The first calculator related to health

The first calculator related to health: BMI calculator. Do not eat too much :P## 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.## 2009.03.22: New calculator: fractions explorer

Some math solver: Fractions explorer. Simplify a fraction in a moment !## 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 !## 2008.12.02: Something about saving: deposit calculator

Money again... This time something about saving: Deposit interest calculator. Income is your friend...## 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.## 2008.07.15: Simple and useful: the multiplication table

Very small thing: the multiplication table added to site.## 2008.07.10: New converter: temperature units

The units of temperature converter is online now. Converts easily Kelvin, Celsius, Fahrenheit and some more.## 2008.07.07: New calculator: cost of area

Next one ready: the cost-of-area calculator.## 2008.06.09: LCM - solve it, divide it, factorize it!

We got GCD, so the twin time: Least Common Multiple - solve it, divide it, factorize it !## 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**!