NeutronDB provides 19 free statistics calculators that you can use directly in your browser — no login, no app download, no cost. Each tool is built with accurate, formula-driven logic and instant results so you can get answers in seconds.

All calculators tagged statistics are optimised for both desktop and mobile, and include step-by-step explanations, worked examples, and FAQs to help you understand the numbers - not just the answer.

Calculators in This Collection

Coefficient of Determination Calculator (R-squared) - Calculate R² (coefficient of determination) from raw data, regression residuals, or SS values. Understand how well your model fits the data. Free online.
Cubic Regression Calculator - Fit a cubic polynomial to your data using least squares. Get coefficients a, b, c, d, R-squared, equation, and predicted values instantly. Free.
Degrees of Freedom Calculator - Calculate degrees of freedom for one-sample t-test, two-sample t-test, Welch's t-test, chi-square, ANOVA, and regression. Free, no signup required.
Exponential Regression Calculator - Fit an exponential curve y = ae^(bx) to your data using log-linearisation. Get coefficients, R-squared, equation, and predicted values instantly.
F-Statistic Calculator - Calculate the F-statistic for two-variance comparison, one-way ANOVA, and regression model significance. Get F-value, p-value, and conclusion. Free online.
Hypothesis Testing Calculator - Step-by-step hypothesis testing for Z-test, t-test, proportion, two-sample, and paired tests. Get test statistic, p-value, and conclusion. Free.
Linear Regression Calculator - Calculate linear regression equation (y = mx + b), slope, intercept, R-squared, correlation coefficient, and residuals from your data. Free online.
Mean Median Mode Calculator - Calculate mean, median, mode, range, variance, and standard deviation from any dataset. Paste your numbers and get full statistics instantly. Free.
Point Estimate Calculator - Calculate point estimates using MLE, Wilson Score, Laplace smoothing, and Jeffreys methods. Supports proportion estimation with confidence intervals.
Polynomial Regression Calculator - Fit a polynomial of any degree from 1 to 6 using least squares. Get all coefficients, R-squared, equation, and predicted values from your data. Free.
Power Analysis Calculator - Calculate statistical power (1−β) for Z-tests and t-tests. Enter effect size (Cohen's d), sample size, and significance level α to find power.
Quadratic Regression Calculator - Fit a quadratic curve to your data using least squares. Get coefficients a, b, c, R-squared, vertex, and predicted values instantly. Free online.
Residual Calculator - Calculate residuals from observed and predicted values. Get SSR, RMSE, mean residual, standardised residuals, and automatic outlier detection. Free.
Sampling Error Calculator - Calculate standard error of the mean, sampling error for proportions, and finite population correction. Get SE, margin of error, and confidence interval.
Standard Deviation Calculator - Calculate population and sample standard deviation, variance, and mean from any dataset. Shows step-by-step breakdown. Free, no signup required.
t-Statistic Calculator - Calculate the t-statistic for one-sample, two-sample, and paired tests. Enter sample mean, standard deviation, and sample size to get the t-value.
t-Test Calculator - Perform one-sample, independent two-sample, and paired t-tests. Get t-statistic, p-value, degrees of freedom, and statistical conclusion. Free online.
Z-Score Calculator - Calculate Z-score (standard score) from a raw score, mean, and standard deviation. Instantly find how many standard deviations a value is from the mean.
Z-Test Calculator - Perform one-sample and two-sample Z-tests for means and proportions. Get Z-statistic, p-value, critical value, and statistical conclusion. Free online.

How to Use These Calculators

Every calculator on NeutronDB follows a consistent three-step pattern:

Enter your values - fill in the input fields. Each field has a label and a sensible default so you can start immediately.
Click Calculate - results appear instantly without a page reload. No waiting.
Read the breakdown - results are accompanied by a formula explanation and a worked example so you can verify the logic yourself.

All tools run entirely in your browser. Your data is never sent to a server, ensuring complete privacy.

Why Use NeutronDB?

NeutronDB is a free, no-signup calculator platform covering finance, math, health, science, engineering, and everyday use. Every calculator is hand-built with verified formulas - not generated approximations - and cross-checked against standard references.

Unlike generic formula pages, each NeutronDB calculator is interactive: enter real numbers and see real results instantly. The formulas and worked examples alongside each tool mean you understand why the answer is what it is.