News:
2017.01.08
New calculla released ! Please go to calculla.com for the calculla v2. It's better, faster, more beautiful, redone for you in most modern technologies.
2015.08.25
Two cars related tables released today: Tire codes - speed ratings and Tire codes - load index
2015.07.30
2015.04.06
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.

Percentage
Calculator finds solutions to common percentage problems. It's done in easy way: more like stories and everyday situations, less like math language.
Some facts
• One percent (1%) is equal to fraction 1/100 or 0,01.
• To convert some number into percent, you need to convert it to fraction with 100 denominator first. Then, nominator of fraction will tell you "number of percents". For example fraction 3/4 after converting to denominator 100 is equal to 75/100, so it's equal to 75% (simply 3/4 = 75%).
• If you need calculate a percent of a number, you have to multiply that number by a proper fraction with 100 denominator. For example 50% from number 10 is equal to 50/100 · 10 = 5.
• The concept of percentage is very useful and popular in many areas of our life, for example:
• Income from bank deposit is usually defined as percent of capital, that you would earn after one year. It's so called annual rate of return.
• Change in a value is often expressed as percentage of inital value. For example: the handbag is 20% cheaper than it was before the summer discount.
• Concentration of one substance in another is often expressed in percentage values (percentage concentration). For example you can buy 3% solution of hydrogen peroxide to desinfect wounds. It means that in 100g of solution you'll get 3g of the active substance (i.e. hydroden peroxide).
How to use this tool

• First of all, find the sentence in calculator, which describes your problem in the closest way. However, don't take those sentences too literally ! Those sentences describe example situations - like buying handbag under promotion. However, you can put any other product in this place. Be creative, don't waste your imagination.
• Next, click on one of input fields in the sentence and enter your own value.
• After you've entered the numbers in the particular sentence, the other part of a sentence will adjust automatically, displaying the correct number as a solution.
• Remember - if you can't find a sentence describing your situation, feel free to drop us a word. We will be happy to add the missing case for you!

## 1. Basics:

1.1.
 % is equal to ? or ? .
1.2. The number is equal to ?%.
1.3.
The fraction is equal to ?%.
1.4. % from the number is ?.

## 2. Shopping:

 2.1. The bike was at a price of \$. Next, its price has been raised by %. After that, the bike costs ? now. 2.2. I'm a regular customer in The Shop and I obtained % discount for future shopping. Regular price of washing machine is \$, but I will pay only ?. 2.3. Yeah! There is a promotion this week - it's % discount for all products. Some nice handbag costs \$ now. It means, the same handbag was at a price of ? before. 2.4. The mobile phone costs \$ in first shop and \$ in another one. It means that, price offered by second shop is ?.

## 3. Bills:

 3.1. My usual electricity bill is about \$ per month. Unfortunately, the bold man in TV was talking about upcoming increase of electricity price by %. It means I will pay ? each month which is ? more. 3.2. Flat owner increased my rent by \$. Before that, I was paying \$ to him. This means my rent has grown by ?%. 3.3. My monthly gas bill is \$ in average. It turned out, that I would pay \$ when I switch to another supplier. It will be ?.
Tags:
percentage · percent · percents

Tags to Polish version:
procent · procenty