Calculator collection · 13 distinct tools
Statistics Calculators
Paste datasets or enter study assumptions to calculate descriptive statistics, spread, correlation, regression, sample size, margin of error and exact combinatorics with formulas and working kept visible.
Statistics pages keep the sample definition, confidence assumptions and dataset math visible. Sampling uncertainty is separated from bias and study-design questions the formula cannot solve.
Open a real interactive tool instead of landing on a thin keyword page.
Formulas, units and assumptions stay visible beside the result.
Move between genuinely different calculations inside one collection.
Supplier, manufacturer, drawing and standards data remain authoritative where required.
Choose the calculation that matches the job
Each page owns a distinct input/output task. Reciprocal forms stay together when the underlying job is the same.
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Statistics Calculator — Mean, Median, Mode, Quartiles, Variance & Standard Deviation
Paste a dataset and calculate count, sum, mean, median, modes, min/max/range, Tukey quartiles, IQR, sample/population variance and standard deviation, standard error, coefficient of variation, skewness, excess kurtosis, outlier fences and a frequency table.
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Standard Deviation Calculator — Sample & Population Variance with Steps
Calculate sample or population standard deviation from pasted data with mean, variance, squared-deviation sum, standard error, coefficient of variation, Tukey outliers and a row-by-row deviation and z-score table.
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Weighted Average Calculator — Values, Weights, Contributions & Plain Average
Paste value-and-weight rows to calculate the weighted mean, weighted sum, total weight, plain average, weighting shift and each row’s normalized weight percentage, product and contribution, without requiring weights to total 100.
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Correlation Calculator — Pearson & Spearman with Paired-Data Working
Paste paired X and Y data to calculate Pearson correlation or Spearman rank correlation with R², covariance, best-fit slope, pair count and an auditable row table.
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Covariance Calculator — Sample & Population Covariance with Correlation
Calculate sample or population covariance from two paired datasets, with means, cross-deviation sum, standard deviations, Pearson correlation and row-by-row working.
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Z-Score Calculator — Standardize or Reverse-Solve x, Mean & SD
Calculate z = (x − mean) / SD or reverse-solve the raw value, mean or standard deviation, with normal-distribution percentile context and substituted steps.
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Confidence Interval Calculator — Mean (z/t) & Proportion with Steps
Calculate 90%, 95% or 99% confidence intervals for a mean with known population SD, a mean with sample SD using t, or a proportion using the Wilson interval.
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Frequency Distribution Calculator — Frequency, Relative & Cumulative Tables
Paste raw data to build ungrouped or grouped frequency distributions with count, relative frequency, cumulative frequency, cumulative percentage, class midpoint and a check against the original n.
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Linear Regression Calculator — Best-Fit Line, R², Correlation & Residuals
Fit a simple least-squares line to paired X/Y data and calculate slope, intercept, Pearson r, R², prediction, residuals and the sums used in the regression.
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Sample Size Calculator — Proportion, Mean, FPC & Response Rate
Calculate a required sample for a proportion or mean from confidence and margin of error, with optional finite-population correction, design effect and expected response rate to estimate invitations.
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Margin of Error Calculator — Proportion or Mean with FPC
Calculate a z-based margin of error for a proportion or mean from sample size and confidence, with optional finite-population correction and a transparent conservative p = 50% option.
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Combinations & Permutations Calculator — Exact nCr, nPr & Factorial
Calculate combinations nCr and permutations nPr together with exact integer arithmetic, factorial context and a clear explanation of when order matters.
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Probability Calculator — AND, OR, Conditional & Complement
Calculate two-event probability with independent AND/OR, general overlap, conditional probability and complements, including consistency checks and visible working.
Open calculatorExplore adjacent calculator collections
Cross-cluster links help you move from measurement to project quantity, electrical relationships, money, statistics or media planning without flattening everything into one giant list.
Measurement Calculators →
Work with tape-measure dimensions, drawing scales, area and unit conversions.
Construction & DIY Calculators →
Estimate area, concrete and tile quantities with visible assumptions and formulas.
Electrical & Engineering Calculators →
Solve foundational voltage, current, resistance and power relationships without hiding the formulas.
Fraction Calculators →
Work with fractions, decimals, mixed numbers and practical inch fractions with the simplifying steps kept visible.
Geometry Calculators →
Solve common 2D area, right triangles, general triangles, circles, rectangles, perimeter, volume and slope from explicit dimensions and formulas.
Screen, Image & Video Calculators →
Plan pixel density, physical screen dimensions, aspect ratios, video bitrate and file size before resizing, converting or compressing media.
Money & Business Calculators →
Model debt payoff, debt-to-income ratios, investment fee drag, discounted cash flows, IRR and sales commission with assumptions and working exposed.
Everyday Planning Calculators →
Solve practical planning, weather, science, logistics and engineering jobs with editable assumptions and visible working.
Formula first, assumptions visible
MAXScanner keeps editable rates, units and dimensions next to the result, shows the working where it helps, and avoids turning reciprocal formulas into duplicate pages. Product documents, financial terms, study design, drawings and applicable standards remain authoritative where required.