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Histogram Maker

Draw a histogram of a numeric variable with an optional normal curve, choose the number of bins, and get the grouped frequency distribution table with class intervals, frequencies and cumulative percentages.

Free · No sign-upWorks with your data
Updated · By Bibin Xavier

Data 90 × 12

Paste from Excel, or drop a CSV, TSV or Excel file here.
Example data 90 rows, 12 variables. Data stays in this browser tab.
IDtext · 90 levelsGrouptext · 3 levelsGendertext · 2 levelsAgenumericHours_StudynumericAnxietynumericMotivationnumericPre_ScorenumericPost_ScorenumericExam_ScorenumericPassednumeric · codedSatisfactionnumeric · coded
S001ControlMale2311.2294.660626712
S002WorkshopFemale233.9283.554705402
S003OnlineFemale1810.132455576603
S004ControlMale2613.6413.552555903
S005WorkshopFemale229.7273.656636504
S006OnlineFemale207.9323.865826502
S007ControlFemale206.328372836103
S008WorkshopMale228293.164726213

Variables and options

Results update automatically when you change an option.

Results

90 rows · example data

Histogram of Exam_Score

Table 1

Frequency distribution

Class intervalMidpointFrequencyPercentCumulative %
42.00 – < 47.3844.6944.44.4
47.38 – < 52.7550.0677.812.2
52.75 – < 58.1355.442224.436.7
58.13 – < 63.5060.811617.854.4
63.50 – < 68.8866.192022.276.7
68.88 – < 74.2571.56910.086.7
74.25 – < 79.6376.94910.096.7
79.63 – 85.0082.3133.3100.0

Note. Bin width 5.375. Intervals include the lower limit; the last interval includes the maximum.

Table 2

Summary

StatisticValue
n90
Mean62.28
SD9.32
Median62.00
Skewness0.17
Kurtosis-0.36

Interpretation

The distribution of Exam_Score is roughly symmetric, centred near 62.00. The most frequent class is 52.75 to 58.13.

How to cite this tool

Using these results in a thesis, journal article, report or class assignment? Please cite this free tool so others can find it. It keeps the site free.

APA 7

Xavier, B. (2026). Histogram Maker [Web application]. FreeStatisticalTools.com. https://freestatisticaltools.com/histogram-maker/

BibTeX 

@software{xavier_histogrammaker_2026,
  author = {Xavier, Bibin},
  title = {Histogram Maker},
  publisher = {FreeStatisticalTools.com},
  year = {2026},
  url = {https://freestatisticaltools.com/histogram-maker/},
  note = {Web application}
}

Suggested sentence for your methods section: “The analysis was carried out with the free Histogram Maker tool on FreeStatisticalTools.com (Xavier, 2026).”

What is a histogram?

A histogram groups a numeric variable into intervals (bins) and shows how many values fall in each. It reveals the shape of a distribution: whether it is symmetric, skewed, bimodal or contains outliers.

When to use a histogram

Use a histogram to see the shape of a continuous variable: its centre, spread, skew and any gaps or outliers. Try a few bin counts, because the shape can change with the bin width.

How to use this tool

  1. Enter your data. Paste columns from Excel, Google Sheets or SPSS with variable names in the first row, or upload a CSV or Excel file. The example data shows the expected layout.
  2. Choose the variables. Select the variable.
  3. Set the options. Fill in number of bins and overlay a normal curve.
  4. Read the results. Results update automatically. Read the plain-English interpretation, then use Copy table to paste APA-style tables into Word and Copy for the results sentence.

How to report a histogram in APA style

Describe the shape (symmetric, skewed, bimodal) and report the mean and SD or median and IQR.

Frequently asked questions

How many bins should a histogram have?

A common starting point is Sturges’ rule, log₂(n) + 1 bins, which the tool uses by default. Try a few values to check that the shape is stable.

What is the difference between a histogram and a bar chart?

A histogram shows a continuous variable split into adjacent intervals, so the bars touch; a bar chart compares separate categories.

What does the normal curve show?

The normal distribution with the same mean and standard deviation as your data, scaled to the histogram, to help judge normality.

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