Calculate standard deviation, averages, LCM, GCF, and convert numbers between binary, hex, decimal, Roman numerals, and common units.
Calculators in this category
- Standard Deviation Calculator — Calculate mean, variance, and standard deviation from a list of values.
- Average Calculator — Find the mean, median, mode, and total of your numbers.
- LCM Calculator — Find the least common multiple of two or more numbers.
- GCF Calculator — Find the greatest common factor of two or more numbers.
- Binary Converter — Convert numbers between binary, decimal, octal, and hex.
- Hex Converter — Convert hexadecimal values to and from other common bases.
- Roman Numeral Converter — Convert Roman numerals and regular numbers in both directions.
- Unit Converter — Convert units for length, weight, temperature, and more.
- Probability Calculator — Compute P(A and B), P(A or B), conditional probability and 'at least once' across trials for any two events.
- Mean, Median, Mode Calculator — Paste any list of numbers and instantly get mean, median, mode, range, and standard deviation in one place.
- Factor Calculator — List every factor and factor pair of any whole number — see if it is prime and how many divisors it has.
- Prime Factorization Calculator — Break any integer into prime factors — see expanded form, exponent notation, and distinct prime count.
- Confidence Interval Calculator — Enter sample mean, standard deviation, sample size, and confidence level to get the lower bound, upper bound, and margin of error.
- Sample Size Calculator — Find how many survey responses or measurements you need for a chosen confidence level and margin of error — for proportions or means.
- Z-Score Calculator — Enter a value, mean, and standard deviation to get the z-score and approximate percentile rank on a normal curve.
- P-Value Calculator — Enter a z-score and choose one-tailed or two-tailed to get the p-value and significance at α = 0.05 and 0.01.
- Statistics Calculator — Paste a list of numbers — get mean, median, mode, range, variance, standard deviation, min, max, and sum in one step.
- Percentile Calculator — Find any percentile of a dataset — enter numbers and the percentile rank (0–100) to get the value.
- Quartile and IQR Calculator — Compute Q1, median (Q2), Q3, and interquartile range (IQR) for any numeric dataset.
- Odds Calculator — Convert between odds and probability — enter decimal odds (e.g. 3 or 3:1) or a probability percentage.
- Stem and Leaf Plot Calculator — Build a stem-and-leaf plot from any number list — see the distribution plus mean, median, and range.
- Sum Calculator — Add up any list of numbers — get the total, count, and mean of your dataset in one step.
- Variance Calculator — Compute population or sample variance from a dataset — see σ² and s² separately from standard deviation.
- Vote Percentage Calculator — Convert votes and total ballots into a percentage — see vote share and remaining votes at a glance.