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Over the years, I have received numerous questions around financial calculators. I will compile a perform of the most frequently asked questions here.

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Q: when using the NPV and also IRR functions, deserve to you define the optional cash flow counts part?

A: Sure. That feature is over there to save some data entry in particular circumstances, and also it serves an identical purpose to the frequency note in plenty of other jae won calculators. If some of your cash operation repeat, then you can include the "cash circulation counts" array. Let me provide you one example:

What is the current value that the following collection of cash operation if the discount price is 8% every year?

100, 200, 200, 200, 300.

Normally, you could solve this trouble using the NPV role as follows:


but an alert that you had actually to kind "200" three times in a row. Making use of the "cash flow counts" range we have the right to do it favor this:


Either way, friend will find that the current value is $774.01. However, the second method saves a little bit the typing and is much less likely to result in data entry errors. That doesn't really save lot time in this basic example, however in other troubles it can. Be aware that if you use the "cash flow counts" array, friend must go into a frequency for each of the cash flows — even those that don't repeat.

Q: The TI-83 (and other) hand-operated tells me to use lists in the NPV and also IRR functions. Why don't you usage them?

I'm a rebel! Seriously, I just think the it is quicker and easier to create on-the-fly arrays fairly than usage lists. For many of what i do, I'm no going come reuse a list more than when or double anyway. Once I do want come reuse it, I have the right to usually usage the editing and enhancing functions to conveniently get it done.

Q: Why am I acquiring an error when I use the NPV and/or IRR functions?

Well, the depends. Most often, the errors that I view in course are brought about by somebody not being careful around separating each variable in the duty by commas. Every comma that you check out (above) is absolutely required. Another frequent reason of errors is neglecting to do the early outlay a negative number. You have to obey the cash flow sign convention even if it is you are using the TVM Solver or the functions.

Q: exactly how do ns calculate the variety of days between two days using the TI 83?

A: The TI 83 and 83 Plus assistance two date formats, MM.DDYY or DDMM.YY. You calculate the difference between two work by using the dbd (days in between dates) duty from the Finance menu. For example, to uncover the number of days in between 25 July 2007 and also 31 December 2007 you would type:

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


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

Either way, you will find that there space 128 days in between those 2 dates.

Note that the TI 83 does not enable you to specify a day counting basis (e.g., 30/360 or actual/360). The basis is always actual/actual.

Q: exactly how do I find roots various other than square roots utilizing the TI-83 Plus?

In finance it appears that we room forever calculating various roots (cube root, 4th root, 365th root, etc). Fortunately, this is pretty simple to do if you deserve to remember a basic mathematical rule:

\<\sqrtX = X^\frac1N\>

So, to calculation the fifth root the 100, we just raise 100 come the 1/5th power. To do this top top the TI-83 to add type: 100^(1/5) ENTER. In this example, the 5th root that 100 amounts to 2.51189. Note that the parentheses room important, otherwise you would raise 100 to the first power and also then division by 5 and also you would obtain 20 as the answer. Utilizing this method you have the right to calculate any type of root.

Q: mine calculator only has a an essential to calculate organic logarithms. Just how do i calculate logarithms to other bases (say, basic 10)?

A: many often, in finance, us use herbal logarithms (base e), commonly abbreviated as Ln(x). However, periodically we have to use various other bases. Convert from basic e to any other base deserve to be done v the complying with formula (I'm converting to base 10):


So, simply calculate the herbal log of your number (use the LN key), and also then division it by the herbal log the the new base. For example, Log10(3) = Ln(3)/Ln(10) = 0.478. Keep in mind that the TI-83 to add does have a LOG key for calculating base 10 logarithms. Still, if friend need an additional base the above formula will occupational — just adjust the 10 to her selected base.

Q: How can I clear the memory of all variables and lists?

A: unequal a complete reset (see below) this is pretty safe to do, despite be careful not to delete any type of lists or variables that you need to save. To clean all memory in a TI 83 or TI 83 Plus:

Press 2nd MEM (that is the second role of the + key)Select 2Select 1 (All)Scroll through the list and delete anything that isn't important.

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Q: How deserve to I completely reset my TI 83 or TI 83 Plus ago to the factory default settings?

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

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

Note that it is possible that a reset may impact the comparison of her screen. If necessary, you can change the comparison of the display screen on the TI-83 through pressing 2nd and climate the up arrowhead (or down arrow) button. You may need to do this repeatedly.