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Weighted average calculator

Compute a weighted average from a list of values and their weights.

Related tools

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Average (mean) calculatorCompute the mean, sum and count of a list of numbers.Average Deviation Calculator (mean absolute deviation)The average absolute deviation from the mean AND from the median — the median is the point that minimises it, which is worth seeing. Every |x − centre| is listed, and the standard deviation sits beside it for contrast: squaring makes SD react hard to a single outlier while the average deviation barely moves. The outlier preset is built to show exactly that.Coefficient of variation calculatorCompute the coefficient of variation (CV) of a dataset — its relative variability.Correlation coefficient calculatorCompute Pearson's correlation coefficient between two lists of numbers.Expected value calculatorCompute the expected value from a list of outcomes and their probabilities.Geometric mean calculatorCompute the geometric mean of a list of positive numbers.Harmonic mean calculatorCompute the harmonic mean of a list of positive numbers.Interquartile range (IQR) calculatorCompute the first quartile, third quartile and interquartile range of a dataset.

Need Weighted average? The Weighted average calculator derives it from Values (comma-separated), Weights (comma-separated) in one step. For instance, with Values (comma-separated) = 85, 90, 70 and Weights (comma-separated) = 3, 2, 1 it returns Weighted average = 84.167.

How to use it

  1. Enter your values: Values (comma-separated), Weights (comma-separated).
  2. Read the result instantly: Weighted average.

Frequently asked questions

How does the Weighted average calculator work?

It takes Values (comma-separated) and Weights (comma-separated) and derives Weighted average from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Values (comma-separated) and Weights (comma-separated). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Values (comma-separated) = 85, 90, 70 and Weights (comma-separated) = 3, 2, 1, the calculator returns Weighted average = 84.167. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Values (comma-separated) = 85, 95, 77 and Weights (comma-separated) = 3, 2, 1 instead, Weighted average goes from 84.167 to 87 — which is why it is worth testing a few scenarios rather than trusting a single figure.

When would I actually use this?

Summarising a dataset before drawing conclusions from it, checking whether a difference between two groups is real, and putting an interval around an estimate.

What is the most common mistake?

Reading a p-value as the probability that the hypothesis is wrong. It is the probability of seeing data at least this extreme if the null were true — a different statement, and a much weaker one.

What is the difference between the Weighted average calculator and the Average (mean) calculator?

This one returns Weighted average; the Average (mean) calculator returns Mean and Sum. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Average Deviation Calculator (mean absolute deviation) is the closest one after this: The average absolute deviation from the mean AND from the median — the median is the point that minimises it, which is worth seeing. Every |x − centre| is listed, and the standard deviation sits beside it for contrast: squaring makes SD react hard to a single outlier while the average deviation barely moves. The outlier preset is built to show exactly that.

What else is worth having open alongside it?

Coefficient of variation calculator and Correlation coefficient calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

Distributions and test statistics are computed from their standard definitions, not from a lookup table, so results carry more digits than a printed table would. The assumptions each test makes are stated with it.

Further reading

All guides →
How-toHow to Calculate a Weighted AverageA weighted average gives some values more influence than others. Learn the Σ(w·x) / Σw formula with grade and portfolio examples you can follow step by step.ExplainerGeometric vs Arithmetic Mean: Which to UseThe arithmetic mean adds and divides; the geometric mean multiplies and takes a root. Learn which fits growth rates, ratios, and averages.ExplainerWhat Is a Percentile? The 90th Percentile ExplainedA percentile tells you where a value ranks within a group. Learn what the 90th percentile really means and why a percentile is not the same as a percentage.ExplainerPercentage Difference vs. Percentage Change vs. Percentage ErrorThree percentages that look alike but answer different questions. Learn the formula for each, when to use it, and why they give different numbers.ExplainerMean, Median and Mode: What's the Difference?Mean, median and mode all describe the 'middle' of your data — but answer different questions. Here's what each means, with examples and when to use which.How-toHow to Calculate Standard Deviation (Step by Step)Standard deviation measures how spread out your data is. Here's the formula, a worked example, and the difference between population and sample.