The tool also displays around 6 different statements to explain how the numbers you selected correlate to each other in terms of percentages and fractions. It also has a great explanation about what percentages are and how they originated. However, the most import part is that you can embed the calculator on any website and can even customize it according to your needs.

Features:

• A simple tool to calculate percentages.
• Displays results in various forms for better understanding.
• Customize and embed calculator on any website.
• No registration required.

Visit PercentageCalculator @ www.percentagecalculator.info

What Did I Work For It is a website that allows people to enter their salaries, by inputting how much they make per annum or per hour, the amount of taxes they pay on it along with their spending.

With a carefully written algorithm, you can then be shown how many hours you work to spend the specific amount of money. For example, you may want to check out if your vacation is worth a few days of your time or not.

Features

• Simple and easy to use.
• Calculate the number of works worked over the year.
• Find the number of hours you work to spend specific amount of money.

Check out WhatDidIWorkForIt @ http://www.whatdidiworkforit.com

How Long Will My Coffee Last is a free to use web tool that all coffee drinkers will immensely appreciate. The tool lets you calculate how long your coffee source will last. The site takes various factors into account for its calculations. It asks you the number of people who drink coffee at your place, the frequency with which coffee is drunk, how many scoops and grams per scoop a cup has, and how much your coffee weighs. Based on these figures, a reasonable estimate for your coffee is given to you.

Features:

• A user-friendly web service.
• Helps calculate how long your coffee will last.
• Considers your coffee source and consumption.
• Gives estimate in days and in number of coffee cups.
• Similar tool: CoffeeSeekr.
• Also read related article: How To Deal With Spilled Coffee or Coke on Your Macbook.

Check out “How Long Will My Coffee Last” @ www.howlongwillmycoffeelast.com (by MOin from Thumb Press)

Just like that, 7 billion people: Which One Are you? By BBC News allows a person to know what their number is from that 7 billion people. It’s interesting and fun to know what number you were. It makes a person feel excited, and old at the same time knowing they were “Number X”.

The service is very easy to use. All a person has to do is visit the website, and input their birthday details. Once done, just click Go and it will tell you which number of person you were at that time. You can even check out population details of any country such as total population, total number of births/deaths every hour and more.

After checking the population details, just click Next, select your Gender and it will tell you the average life expectancy rate in that specific country for men and women. Furthermore, it will also tell you the country with the highest and lowest life expectancy.

Click on Next and it will show you the overall results, your number in 7 billion, your country’s population details, average life expectancy in your country of residence and more. If you want, you can share the results on different social networks as well.

Features:

• Its free.
• Allows you to find where you fit in.
• Average life expectancy of genders in your country of residence.
• Population information.

Check out The World At 7 Billion @ http://www.bbc.co.uk/news/world-15391515 (By Hammad from Technicallydigital)

Just enter your age and some financial information then the tool will compare it to accepted standards and let you know how you are doing. For example, if your debt payments are less than 36% of your annual gross income, you are in a good position. It also looks at things like portfolio diversification and company stock. If you are doing poorly in a particular area, it will give you additional information.

Features:

• Check your financial health with a simple quiz.
• Covers topics like debt, house payment, investments and more.
• No registration required.
• Similar tools: WhereMyMoneyGoes, VisualEconomics, TaxACT, and CalcMoolator.

Visit FinancialHealth @ http://cgi.money.cnn.com/tools/financialhealth/index.html [Via LifeHacker]

OpalCalc is an excellent calculation app for Windows computers with .NET 3.5 or higher installed. The app lets you type in your calculations as you normally would on a piece of paper – by indicating which value belongs to which item/expense. Your total is then easily calculated using the dedicated word ‘total.’ You can also assign values to variables and use those variables to calculate formulas.

To a great degree, many mid-level math calculations are also supported. For instance the value of ? is already built into the function and ready for you to use through the reserve word ‘pi.’

In case you want to use other mathematical operators, you can always type them or select them from the app’s options.

OpalCalc offers a free version with a “5 line per calculation” limit. The Pro version removes this limit and can be obtained by donating the app any amount through PayPal.

Features:

• A user-friendly desktop application.
• Compatible with Windows.
• Lets you execute calculations in an intuitive way.
• Supports variable assignments.
• Supports mathematical operators and values.
• Similar tools: Desmos Calculator, Online Function Generator and Graphing Calculator.

Check out OpalCalc @ www.skytopia.com/software/opalcalc/ (By Umar from AllThatIsApple)

Calkoo is a free to use web service that will prove useful to countless people on the Internet. The site is basically a suite of various calculator web-apps. Depending on your type of calculation you can select the appropriate app from the list available on the site. The list is categorized into wages, budgeting, financial analysis, capital costs, stocks, measurements, loans, savings, health, and mathematics.

Simply click on a calculator in these categories and you will be taken to a page where you can enter your values and have them computed for your desired answer.

Features:

• A user-friendly web service.
• A suite of online calculators.
• Covers a wide range of calculations.
• Does not require any registration.
• Similar tools: CalcMoolator, Mookal, MyBankTracker, IRS Withholding Calculator, WhatsTheCost, TripLittle and Repayment Calculator.

Check out Calkoo @ www.calkoo.com (By Umar from AllThatIsApple)

Desmos Calculator is a free to use web tool that comes as an app for Google Chrome. The tool’s interface is completely online and loads up once you click on the app’s icon in Chrome. You can choose to plot normal graphs or polar graphs by typing in the equation of your functions. You can also plot sample plots on the graph. You can plot multiple equations on a single graph and choose custom colors for each. Your graphs can be exported to PNG files for sharing.

Desmos also lets you enter regular calculations into it: addition, multiplication, and trigonometric functions, all are supported. Factorials, summations, square roots, exponents, and other scientific mathematical calculations can also be found on the calculator.

Features:

• A user-friendly application.
• Lets you graph complex equations – Cartesian and Polar.
• Lets plot multiple equations on same graph.
• Exports graphs to PNG files.
• Performs scientific mathematical calculations as well.
• Similar tools: Online Function Generator and Graphing Calculator.

Check out Desmos Calculator @ www.desmos.com (By Umar from AllThatIsApple)

Splitwise Guest Calculator is a free to use web app that lets you calculate the amount you owe your friends for staying at their place. The app is quite simple to use – you enter in the rent amount, its frequency, the number of people that normally live in the apartment, and the number of nights you will be staying. Just enter in this information, click on the Calculate button and the amount you owe will be displayed.

With the amount the site also ‘guesses’ whether or not your hosts will be expecting a contribution at the end of your stay.

Features:

• A user-friendly web app.
• Lets you calculate how much you owe for staying at your friend’s.
• Factors in total rent, people living in apartment, and duration of your stay.
• ‘Guesses’ if your hosts will be expecting a contribution.
• Similar tools: BillMonk, PayMeBack, YomTicket, WhatsYourShare and Billster.

Check out Splitwise Guest Calculator @ www.splitwise.com/calculators/guest (via Life Hacker) (by MOin from Urban Savior)

Calorific Lite is a free to use phone application for iOS and Android that helps you easily track your consumed calories. The app lets you easily log your food into three colors: green, yellow, and red. Healthy foods such as fruits go into green while candies and carbonated drinks go into red. If you are unsure of which color to log your food into, simply search for it in the app.

Along with the color you also have to log the size of your consumed foods. Do this consistently enough and you will have obtained a simple yet effective way to keep a track of your calories. The app, in addition to estimating your calorie count, represents your food ratio on a pie chart against the ideal ratio.

Features:

• A user-friendly web service.
• Lets you easily keep log your food into calorie categories.
• Lets you log size of your foods.
• Estimates you calorie count.
• Represents your food ratio as a pie chart.
• Similar tools: MealSnap, NutritionToolbox, Fatburgr and ShugarStacks.

Check out Calorific Lite @ www.worksmartlabs.com/calorific (By Umar from AllThatIsApple)