Free statistics calculators built for thesis and dissertation research. Every tool shows SPSS-style output, step-by-step working, a ready APA 7 paragraph and a short Roman Urdu explanation. All calculations run in your browser.
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Reliability Calculators
Cronbach's Alpha Calculator
Free Cronbach's alpha calculator: paste Likert data from Excel/SPSS, get alpha, 95% CI, item-total stats, alpha if item deleted and an APA 7 write-up.
Cohen's Kappa Calculator (Inter-Rater Reliability)
Free Cohen's kappa calculator for inter-rater reliability. Paste two raters' codes (numbers or words) to get kappa, SE, z, p, 95% CI and an APA sentence.
Sample Size & Power Calculators
Sample Size Calculator for Thesis
Free sample size calculator for thesis and survey research. Cochran's formula with finite population correction and Yamane's formula, with working and APA text.
Power Analysis Calculator
Free a priori power analysis calculator for the independent t test. Enter effect size, alpha and power to get the sample size per group, like G*Power.
Compare Groups Calculators
Independent Samples t Test Calculator
Free independent samples t test calculator. Paste two groups from Excel and get Levene's test, Student and Welch t, 95% CI, Cohen's d and an APA write-up.
Paired Samples t Test Calculator
Free paired t test calculator for pre-test/post-test data. Get mean difference, 95% CI, t, p, Cohen's d_z, step-by-step working and an APA 7 sentence.
One-Way ANOVA Calculator with Tukey HSD
Free one-way ANOVA calculator with Tukey HSD post hoc test. Paste groups from Excel and get the ANOVA table, eta squared and an APA 7 write-up.
Repeated Measures ANOVA Calculator
Free repeated measures ANOVA calculator with Mauchly's test, Greenhouse-Geisser and Huynh-Feldt corrections, Bonferroni pairwise tests and APA 7 output.
Relationship & Correlation Calculators
Pearson Correlation Calculator
Free Pearson correlation coefficient calculator. Paste X and Y from Excel to get r, r², p-value, 95% CI, a scatter plot and an APA 7 sentence.
Spearman Rank Correlation Calculator
Free Spearman rank correlation calculator for ordinal or non-normal data. Paste X and Y to get rho, p-value, 95% CI, scatter plot and an APA 7 sentence.
Linear Regression Calculator (Simple & Multiple)
Free simple and multiple linear regression calculator with SPSS-style output: model summary, ANOVA, coefficients, beta, VIF and an APA 7 write-up.
Effect Size Calculators
Cohen's d Effect Size Calculator
Free Cohen's d effect size calculator from means, SDs and sample sizes. Get d, Hedges' g, Glass's delta, 95% CI and an APA-ready sentence.
Descriptive Statistics Calculators
Descriptive Statistics Calculator
Free descriptive statistics calculator: mean, median, mode, SD, variance, SE, quartiles, skewness and kurtosis (SPSS formulas) with histogram and APA text.
Non-Parametric & Categorical Data Calculators
Chi-Square Test of Independence Calculator
Free chi-square test of independence calculator. Paste a contingency table to get expected counts, χ², df, p-value, Cramér's V and an APA 7 sentence.
Mann-Whitney U Test Calculator
Free Mann-Whitney U test calculator. Paste two groups from Excel and get ranks, U, z, p, effect size r and an APA 7 sentence. Handles ties like SPSS.
Wilcoxon Signed-Rank Test Calculator
Free Wilcoxon signed-rank test calculator for paired, non-normal data. Get positive and negative ranks, T, z, p, effect size r and an APA 7 sentence.
Kruskal-Wallis Test Calculator with Dunn Post Hoc
Free Kruskal-Wallis H test calculator with Dunn's post hoc (Bonferroni). Paste groups from Excel and get H, p, epsilon squared and an APA 7 write-up.