Calculator.net

Calculator.net provides free online calculators grouped into financial tools such as mortgage, loan, auto loan, interest, retirement and income tax calculators; fitness and health tools including BMI, calorie, body fat and pregnancy calculators; math tools such as a scientific calculator, fraction calculator and standard deviation calculator; and other tools like an age calculator, GPA calculator, concrete calculator and password generator. The site states it has around 200 calculators across these areas, with plans to add more, and that all tools are free with no registration required. Some calculators, such as the income tax calculator, are described as applying to United States residents only.