14 free tools

Free Online Research and Statistics Tools

Calculators and generators for students, researchers and thesis writers. Plan your sample size, run a t-test, pool studies in a meta-analysis, draw a PRISMA diagram, format your references and plan your PhD, all for free in your browser.

100% freeNo sign-upYour data stays on your deviceWorks on mobile

Statistics · 6 tools

Plan your sample, test your hypotheses and describe your data.

Sample Size CalculatorHow many participants do you need? Surveys, two groups, proportions and correlations.Open tool →Descriptive Statistics CalculatorMean, median, mode, SD, SE, quartiles, skewness, outliers, a histogram and a box plot.Open tool →T-Test CalculatorIndependent (Student/Welch), paired and one-sample t-tests with effect size and an APA sentence.Open tool →Chi-Square CalculatorContingency tables up to 6×6, expected counts, Cramér's V, Yates and Fisher's exact test.Open tool →Correlation and Regression CalculatorPearson r, Spearman's rho, R², the regression equation and a scatter plot.Open tool →P-Value CalculatorGet p-values or critical values for z, t, χ², F and r, with a shaded distribution plot.Open tool →

Systematic review & meta-analysis · 4 tools

Frame your question, report your screening and pool your results.

PICO Research Question BuilderBuild a PICO, PEO, SPIDER or PCC question, a review title and database search strings.Open tool →PRISMA Flow Diagram GeneratorMake a PRISMA 2020 flow diagram with automatic counts, then download it as PNG or SVG.Open tool →Effect Size CalculatorCohen's d, Hedges' g, odds ratio, risk ratio and conversions, with 95% CIs.Open tool →Meta-Analysis CalculatorPool studies with fixed and random effects, I², a forest plot, a funnel plot and Egger's test.Open tool →

Writing & planning · 3 tools

Write, cite and plan your thesis, paper or proposal.

Citation GeneratorFormat references and in-text citations in APA 7, Harvard, MLA 9, Vancouver and Chicago.Open tool →Academic Word CounterCount words against a limit, check readability, long sentences and your most-used keywords.Open tool →Research Gantt Chart MakerPlan your PhD, thesis or project with a Gantt chart. Start from templates and download as PNG.Open tool →

Students · 1 tool

Handy calculators for university and study abroad applications.

GPA and CGPA CalculatorCalculate semester GPA and cumulative CGPA, and see the GPA you need to hit your target.Open tool →

Why use Codanics tools?

🔒 Private by designEverything runs in your browser. Your data is never uploaded.
📐 Transparent formulasEach tool shows the method, so you can cite and explain it in your methods section.
✍️ Ready-to-paste resultsGet APA-style sentences, tables and high-resolution charts for your thesis.
🎓 Made by a researcherBuilt by Dr. Muhammad Aammar Tufail for the students he teaches every day.
Learn to do it yourself. These tools pair with free Codanics lessons on YouTube and full courses on systematic reviews, meta-analysis, statistics and scientific writing.
Systematic review & meta-analysis courseSubscribe on YouTube

Frequently asked questions

Are the Codanics tools really free?

Yes. Every tool is free, with no sign-up, no limits and no watermark on downloads.

Is my data safe?

Yes. The tools run entirely in your web browser using JavaScript. Your numbers, text and references are never uploaded to Codanics or any other server.

Can I use the results in my thesis or paper?

Yes. The statistics tools use standard, published formulas and show them on each page so you can describe them in your methods. For important analyses, double-check with R, SPSS or your supervisor, as you would with any software.

Do the tools work on my phone?

Yes. All tools work in any modern browser on phones, tablets and computers. Larger tables and charts are easier on a laptop.

Can you add a new tool?

Yes, please suggest it in the YouTube comments or on the Codanics WhatsApp channel. We build new tools based on what students and researchers ask for.

Made by Dr. Muhammad Aammar Tufail, Codanics. Results are for learning and planning; check important analyses with a statistician or your supervisor.