How to Turn On Frequency on Casio Calculator

Updated 6 November 2026 · Standard formula, shown below

This guide shows you how to access the frequency function on Casio scientific and graphing calculators, which lets you enter data with a count of how many times each value occurs. This is useful for statistics problems where you have repeated values, like survey results or grouped data. You’ll need your Casio calculator and, ideally, its manual handy, though the steps below cover the most common models.

What You’ll Need

A Casio scientific calculator (fx-83, fx-85, fx-991, or similar) or a Casio graphing calculator (fx-CG series, fx-9750GII, etc.)
Your data set with frequencies (e.g., value 5 appears 12 times)
Familiarity with the STAT mode (usually accessed by pressing MODE and then 2 or 3)

Step-by-Step

Enter STAT mode: Press the MODE button (or MENU on graphing models). Select STAT (usually option 2 on scientific, or the STAT icon on graphing).
Choose the list type: If prompted, select 1-VAR (one-variable statistics) for a single data set. This is the standard for frequency tables.
Enable frequency column: On scientific models, press SHIFT then SETUP (or MODE again). Scroll down to Statistics and select Frequency On (usually option 1). On graphing models, go to the list editor and press F6 (SET) then F1 for Frequency, and set it to On.
Enter your data: You’ll now see two columns: List 1 (for the values) and List 2 (for the frequencies). Type each value in List 1, press = (or EXE), then type the corresponding frequency in List 2 and press = again.
Calculate statistics: After entering all data, press AC (or EXIT on graphing) to leave the list editor. Then press SHIFT followed by 1 (on scientific) or F6 then F1 (on graphing) to open the statistics menu. Select 1-VAR (usually option 1) to see results like mean, sum, and standard deviation.
Read the results: The calculator will display the mean (x̄), sum (Σx), and other stats. These calculations now account for the frequencies you entered.

Common Mistakes

Forgetting to turn on frequency: If you skip step 3, the calculator treats each entry as a single occurrence, giving wrong results.
Entering data in the wrong column: Values go in List 1, frequencies in List 2. Swapping them will produce nonsense.
Not clearing old data: If you have previous data in the lists, it will be included. Always clear lists before a new problem (SHIFT + CLR, then select All or List).
Using the wrong mode: Make sure you’re in 1-VAR, not 2-VAR (which is for paired data).

Tips

On scientific models, the frequency column is usually called “Freq� and appears only after you enable it. On graphing models, it might be a third column (List 3) depending on your settings.
Use the REPLAY arrow keys to navigate between columns quickly.
If you have a large data set, double-check a few entries before calculating—typos in frequencies are common.
For grouped data (e.g., age ranges), use the midpoint of each class as the value in List 1.

Troubleshooting

If you don’t see a frequency column after following the steps:

Check your model: Some older or basic models (like fx-82MS) do not support frequency columns. In that case, you’ll need to manually repeat each value as many times as its frequency, or use a different calculator.
Reset the calculator: Press SHIFT + 9 (CLR) and select Setup to restore defaults, then try enabling frequency again.
Update your method: On graphing calculators, the frequency setting might be under SETUP (SHIFT + MENU) rather than the list editor. Look for “Frequency� in the statistics settings.
If results seem off: Verify that the frequency column is actually filled—blank cells are treated as zero, not ignored.

Frequently Asked Questions

Why can’t I find the frequency option on my Casio calculator?

Most scientific models have it under SHIFT + SETUP > Statistics > Frequency. If it’s not there, your model may not support it, or you need to enter STAT mode first.

Can I use frequency with grouped data?

Yes, enter the class midpoint as the value and the class frequency as the frequency. The calculator will treat it as if each midpoint occurred that many times.

Do I need to sort my data before entering?

No, the calculator sorts internally for statistics. Just make sure each value is paired with its correct frequency.

What does the frequency column actually do?

It tells the calculator how many times each value appears, so you don’t have to type repeated values. For example, if 7 appears 10 times, you enter 7 in List 1 and 10 in List 2.

How do I clear the frequency column?

Go to the list editor, highlight the column header, and press SHIFT + DEL (or F6 > DEL on graphing). Or clear all lists with SHIFT + CLR > All.

Will the standard deviation be correct with frequencies?

Yes, the calculator uses the frequencies to compute sample or population standard deviation correctly, as long as you’ve entered the data properly.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.