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The **Factorial** calculator computes the factorial of the input value **n**.

The **mean density of of aluminum **is 2,700 kg/m^{3}.* Aluminum Objects*

The **Amortization** calculator computes the payments on a loan based on the principal (P), interest rate per period (i), number of periods (t), and the payments per period (n).

The **Monthly Payment (a.k.a. Amortization)** calculator computes the monthly payment required to pay off a debt with a fixed interest rate over a period of time.

The **Apsis** calculator has the following functions:

The **Arc-cosine** function computes the arc-cosine based on a real number between -1 and 1.

The **Arc-sine** function computes the arc-sine based on a real number between -1 and 1.

The arctangent is the inverse function for the tangent. In other words if tangent(y) = x, then arcta

This is the mean density of of benzene.

**Name**: Kurt Heckman**Company**: vCalc LLC**Position**: co-President & CEO

- co-Founder of vCalc with Adam Siegel and Dave Reumont
- President of Sycamore.US from 1996 to 2010
- Aerospace engineer since 1985, specializing Mission Planning systems for low-earth orbit remote sensing satellites.
- B.S. Mathematics from Eastern Nazarene College

*Welcome to vCalc! We are glad you're here. At vCalc.com, we are working very hard to give you the math tools that will make life easier for you and others around the globe, all for free. We are constantly improving vCalc, and with your help, we hope to make vCalc:*

*the go-to place on the Internet and on your mobile device to do the math you need in your daily life,**the place where you can customize equations and calculators to create just the math and data you need in your own suite of personalized calculators, and**the only place on the web to "socialize math" in a way that lets people share their math capabilities with their social network and the world, and in doing so, make the world a better place.*

*vCalc is the place where people who understand the math in any given topic can create and share free online calculators. Some have called it the Wikipedia of Calculators.*

*At vCalc, we would love for you to learn the math and then let us do the arithmetic. Even the best mathematicians and scientists can enter an equation or long number wrong. That's were vCalc wants to help. vCalc has over 12,000 calculator pages as of this date (4/18/2018) with thousands of formulas and constants that have been crowd sourced in a way that lets anyone see the algorithms and data. In this way, mistakes are corrected through continuous review. We ask that you always check your answers before making critical decisions based on the results and that you let us know if you ever find an error. There's a feedback button on every page.*

*Finally, we earnestly believe that when vCalc provides a tool to help one person, thousands will eventually benefit. So, please do not hesitate to contact us with requests for a specific calculator that would help you. We are glad you are here, and we would love to hear from you.*