Compare means

One-Sample T-Test Calculator

Compare the mean of one sample against a fixed value, such as a scale midpoint, a national norm or a target.

Free · No sign-upReplaces SPSSWorks with your data

Updated 13 October 2026 · By Bibin Xavier

Data 90 × 12

Paste from Excel, or drop a CSV, TSV or Excel file here.Upload file

Example data 90 rows, 12 variables. Data stays in this browser tab.

IDtext · 90 levels	Grouptext · 3 levels	Gendertext · 2 levels	Agenumeric	Hours_Studynumeric	Anxietynumeric	Motivationnumeric	Pre_Scorenumeric	Post_Scorenumeric	Exam_Scorenumeric	Passednumeric · coded	Satisfactionnumeric · coded
S001	Control	Male	23	11.2	29	4.6	60	62	67	1	2
S002	Workshop	Female	23	3.9	28	3.5	54	70	54	0	2
S003	Online	Female	18	10.1	32	4	55	57	66	0	3
S004	Control	Male	26	13.6	41	3.5	52	55	59	0	3
S005	Workshop	Female	22	9.7	27	3.6	56	63	65	0	4
S006	Online	Female	20	7.9	32	3.8	65	82	65	0	2
S007	Control	Female	20	6.3	28	3	72	83	61	0	3
S008	Workshop	Male	22	8	29	3.1	64	72	62	1	3

Variables and options

Variable

Test value (μ₀)

Results update automatically when you change an option.

Results

90 rows · example data

Table 1

One-sample statistics

Variable	n	M	SD	SE
Exam_Score	90	62.28	9.32	0.98

Table 2

One-sample t-test (test value = 60)

	t	df	p	Mean difference	95% CI	Cohen’s d
Exam_Score	2.32	89	.023	2.28	[0.33, 4.23]	0.24

Sample mean against the test value

Interpretation

The mean Exam_Score (62.28) was significantly higher than the test value of 60, a small effect (d = 0.24).

t(89) = 2.32, p = .023, d = 0.24, 95% CI of the difference [0.33, 4.23].

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). One-Sample T-Test Calculator [Web application]. FreeStatisticalTools.com. https://freestatisticaltools.com/one-sample-t-test-calculator/

BibTeX

@software{xavier_onesamplettest_2026,
  author = {Xavier, Bibin},
  title = {One-Sample T-Test Calculator},
  publisher = {FreeStatisticalTools.com},
  year = {2026},
  url = {https://freestatisticaltools.com/one-sample-t-test-calculator/},
  note = {Web application}
}

Suggested sentence for your methods section: “The analysis was carried out with the free One-Sample T-Test Calculator tool on FreeStatisticalTools.com (Xavier, 2026).”

What is a one-sample t-test?

The one-sample t-test compares the mean of one sample with a known or hypothesized value, such as a scale midpoint, a population norm or a target. Paste your data, set the test value and get the full result with an effect size.

When to use a one-sample t-test

Use it to test whether a sample mean differs from a specific number, such as the midpoint 3 of a five-point scale.

Assumptions

The variable is continuous.
Observations are independent.
The variable is roughly normal, or n is above about 30.

How to use this tool

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.
Choose the variables. Select the variable.
Set the options. Fill in test value (μ₀).
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 one-sample t-test in APA style

“Exam scores (M = 63.4, SD = 9.8) were significantly above 60, t(89) = 3.29, p = .001, d = 0.35.”

Frequently asked questions

When should I use a one-sample t-test?

Use it when you have one group and want to know whether its mean differs from a specific value, for example whether average satisfaction differs from the neutral midpoint of 3.

What is the formula?

t = (M − μ₀) / (SD / √n), with n − 1 degrees of freedom.

What if my data are not normal?

With about 30 or more cases the test is robust. For small, skewed samples use a one-sample Wilcoxon signed-rank test instead.

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