Average
calculator
Paste your numbers, get every average at once: mean, median, mode, plus range and standard deviation. And crucially: which one to trust for your data.
Doing it by hand too?
A few solid picks. As an Amazon Associate, Calculate.to earns from qualifying purchases, at no extra cost to you.
Casio fx-83GTCW+
The UK classroom-standard scientific calculator (also in pink), allowed in most UK exams.
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Helix Oxford Scientific
240-function scientific calculator for KS3–KS4 maths, with hard cover. Exam-friendly, plastic-free packaging.
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OSALO Desktop Calculator
Extra-large 12-digit LCD, giant buttons, solar + battery, the classic office desk workhorse.
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ROATEE Construction Calc
Feet-inch-fraction engineering calculator for carpenters, framers and contractors on site.
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Three averages, three answers
The mean is the sum divided by the count. The median is the middle value once sorted. The mode is the most frequent value. On tidy symmetric data they agree; on real data they split, and the split tells you something.
Median, skewed data with outliers (incomes, house prices)
Mode, categories & most-common questions (shoe sizes)
The outlier effect
Add one billionaire to a room of nine ordinary earners and the mean income goes stratospheric while the median barely moves, which is why income statistics quote medians. If your mean and median disagree sharply, your data is skewed; report the median.
Standard deviation, briefly
It measures spread: how far values typically sit from the mean. Two datasets can share a mean of 15 while one hugs it and the other swings wildly, the standard deviation is the number that tells them apart. (This tool uses the population form, dividing by n.) For a single percentage change instead, the percentage calculator is next door.
Average FAQ
Mean is the arithmetic average (sum ÷ count), median is the middle value when sorted, mode is the most frequent value. They agree on symmetric data and diverge on skewed data.
When outliers or skew distort the picture, incomes, house prices, response times. The median ignores extreme values; the mean gets dragged toward them.
How spread out the values are around the mean. Small means clustered and consistent; large means highly variable. This calculator uses the population formula (dividing by n).
Anything separated by commas, spaces, semicolons or new lines, straight from a spreadsheet column works. Non-numeric entries are ignored.