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Over the years, I have received many questions about financial calculators. I will compile a list of the most frequently asked questions here.

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Q: when using the NPV and also IRR functions, have the right to you describe the optional cash flow counts part?

A: Sure. That feature is over there to conserve some data entrance in particular circumstances, and it serves an identical purpose to the frequency note in countless other gaue won calculators. If some of your cash operation repeat, climate you can include the "cash flow counts" array. Let me offer you an example:

What is the current value the the following series of cash flows if the discount price is 8% every year?

100, 200, 200, 200, 300.

Normally, you might solve this trouble using the NPV function as follows:


but an alert that you had to form "200" 3 times in a row. Using the "cash flow counts" array we deserve to do it favor this:


Either way, you will discover that the existing value is $774.01. However, the second technique saves a tiny bit that typing and is less likely to cause data entry errors. That doesn't yes, really save much time in this straightforward example, however in other problems it can. Be aware that if you usage the "cash circulation counts" array, friend must get in a freqency because that each that the cash operation — also those the don't repeat.

Q: The TI-84 Plus manual tells me to use lists in the NPV and IRR functions. Why don't you use them?

I'm a rebel! Seriously, I simply think that it is quicker and also easier to develop on-the-fly arrays rather than usage lists. For many of what i do, I'm not going to reuse a list an ext than when or double anyway. As soon as I execute want to reuse it, I have the right to usually usage the modifying functions to quickly get the done.

Q: Why am I getting an error when I usage the NPV and/or IRR function?

Well, that depends. Most often, the errors the I view in course are caused by somebody no being careful about separating each variable in the function by commas. Every comma that you view (above) is absolutely required. Another frequent reason of errors is neglecting to make the early outlay a negative number. You need to obey the cash flow sign convention even if it is you are using the TVM Solver or the functions.

Q: just how do i calculate the number of days between two dates using the TI 84 Plus?

A: The TI 84 Plus supports two day formats, MM.DDYY or DDMM.YY. You calculation the difference between two job by making use of the dbd (days in between dates) function from the Finance menu. For example, to find the variety of days in between 25 July 2007 and also 31 December 2007 you would type:

dbd(08.2507,12.3107) if you are using MM.DDYY


dbd(2508.07,3112.07) if you space using DDMM.YY

Either way, girlfriend will discover that there space 128 days in between those 2 dates.

Note the the TI 84 Plus go not permit you to specify a day count basis (e.g., 30/360 or actual/360). The basis is constantly actual/actual.

Q: exactly how do I uncover roots various other than square roots using the TI-84 Plus?

In finance it appears that we are forever calculating assorted roots (cube root, 4th root, 365th root, etc). Fortunately, this is pretty basic to execute if you have the right to remember a simple mathematical rule:

\<\sqrtX = X^\frac1N\>

So, to calculate the fifth root the 100, we simply raise 100 to the 1/5th power. To execute this top top the TI-84 add to type: 100^(1/5) ENTER. In this example, the fifth root the 100 amounts to 2.51189. Note that the parentheses room important, otherwise you would raise 100 come the 1st power and then division by 5 and you would gain 20 as the answer. Utilizing this method you have the right to calculate any type of root.

Q: my calculator only has a crucial to calcuate herbal logarithms. Just how do i calculate logarithms to other bases (say, basic 10)?

A: many often, in finance, us use herbal logarithms (base e), typically abbreviated as Ln(x). However, periodically we need to use other bases. Converting from basic e to any other base can be done through the complying with formula (I'm converting to base 10):


So, simply calculate the organic log of her number (use the LN key), and also then division it by the natural log that the brand-new base. Because that example, Log10(3) = Ln(3)/Ln(10) = 0.478. Note that the TI-84 to add does have actually a LOG crucial for calculating basic 10 logarithms. Still, if friend need an additional base the above formula will work-related — just adjust the 10 to your selected base.

Q: How deserve to I clear the storage of every variables and also lists?

A: unlike a finish reset (see below) this is pretty safe to do, despite be cautious not to delete any type of lists or variables the you should save. To clean all memory in a TI 84 Plus:

Press 2nd MEM (that is the second function of the + key)Select 2 (Mem Mgmt/Delete)Select 1 (All)Scroll with the list and also delete anything the isn't necessary using the DEL button.To exit, press second QUIT.

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Q: How deserve to I completely reset my TI 84 Plus earlier to the factory default settings?

A: Be mindful with this as it will remove any type of programs the you may have stored in the calculator. Through that disclaimer stated, here's how to reset it:

Press second MEM (that is the second duty of the + key)Choose 7 (Reset)Scroll right so that ALL is selectedPress 1Press 2 (Reset, and read the warnings)

Note the it is possible that a reset may influence the comparison of your screen. If necessary, girlfriend can change the contrast of the display screen on the TI-84 by pressing 2nd and then the up arrow (or down arrow) button. You may need to do this repeatedly.