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Everyone needs to know quantities, for do calculi of  them easier, you can use calculators. In this article describes different kinds of online free calculators that you can find in the Internet. Online free calculator is a software that you used to perform mathematical operations online without download any file to your computer at no cost. You can classify online calculators in several types. Here, the most common online calculators:

Basic Calculator

It is a calculator that you use for basic arithmetic operations, addition, subtraction, multiply, obtaining square roots and percentages. You use this calculator for necessities day-to-day.  

   Basic Calculator, unit converter calculator, cooking measure calculator and others

Scientific Calculator

This calculator is use for more advanced math. Several of these calculations are: trigonometry, powering of the numbers, logarithms, statistics and other functions. Also several has scientific constants like PI number (PI= 3.1415….) in their memories, and you can work with angles using different modes: degrees, radians and gradians. Many of these calculators are based in Java language.

Basic, scientific and unit converter calculators

Graphing Calculator

This calculator makes graphic of mathematical functions using two variables. Functions are entered the calculator using the keyboard. You can set the limits of the minimum and maximum values in the x-axis and in the y-axis.

Graphing Calculator

Unit Converter Calculator

This calculator converts quantities of volumes, weight, distances, areas, and other measures to one unit to another. For example you can convert feet to meter, or convert pounds to kilograms.

Business and Financial Calculators

These calculators are used to calculate quantities related to businesses and finances. Time value of the money (future and present values), cash flows, mortgages, compound interest and debts are several of the quantities that you can calculate.

Financial Calculator

Specialized engineering Calculators

These are used to calculate quantities related to different branches of engineering: civil, structural, electrical, mechanical, electronic, etc.

Calculatoredge

There are other calculators, these calculators are not focussed on technical matters. You can find many of them surfing in the Internet, unit converters for cooking calculators, body mass index (BMI) calculators, basal metabolic rate calculator are several of them. You choose the calculator according to your necessities. There are calculators from simple to most complicated.