Numbers & Calculators Complete Guide
Calculators, base converters, stats helpers, and number-theory tools — mapped by what you need done.
Overview
This collection covers everyday math (percentages, unit conversion), programming bases (binary/hex), descriptive stats, and a few number-theory checks. Results run in the browser; double-check inputs when money or grades are on the line.
Calculators
- Stats basics: mean/median/mode, spread. Average, standard deviation.
- Percentages: increase, discount, proportion. Percentage calculator.
- Probability: combinations, simple probability. Combinations, probability.
- Dates: age and day gaps. Age, date difference.
- Units & rounding: Unit converter, rounding.
Number bases
Binary (base 2)
0s and 1s. Memory, bit ops, low-level work. Binary↔decimal.
Hex (base 16)
0–9 and A–F. Colors, addresses, dumps. Use base converter.
Octal (base 8)
0–7. Still shows up in Unix permissions.
Other formats
Statistics
- Center: mean, median, mode.
- Spread: std dev, variance, range, quartiles.
- Relation: correlation, confidence interval.
- Charts: histogram, box plot, frequency table.
Number theory & bits
Advanced / teaching
- Linear regression, z-scores, Monte Carlo.
- Puzzles: magic squares, pattern completer.
- Dev helpers: Base36 IDs, checksums.
Practices
- Check units and decimal places before you trust an answer.
- Prefer median when outliers warp the mean.
- Plot the data once before summarizing it.
- For loans and investing, treat these as estimates — not advice.
- Convert bases with integers when you need exact round-trips.
Complete Numbers & Calculators Catalog
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Frequently Asked Questions About Numbers & Calculators
Common questions about stats, bases, and calculators.
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Average Calculator
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Calculate your Body Mass Index (BMI) using metric or imperial units. Get instant health category classification and personalized weight range recommendations.
Box Plot Generator
Generate box plots from data
Combinations Calculator
Calculate combinations