Weighted Average Calculator

Find an average when each value carries a different weight. Enter your own values below to see weighted average and check the method behind it.

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Your inputs

Change the example values to match your situation.

One value, weight pair per line.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Weighted average = sum(value × weight) ÷ sum(weights).

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What is Weighted Average Calculator?

Weighted Average Calculator helps you find an average when each value carries a different weight.

The main result is weighted average. The formula, example and assumptions below explain how to interpret it.

How to use Weighted Average Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather values and weights. Use values from the same situation or reporting period.
  2. Replace the example values and weights with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read weighted average. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter values and weights in the format shown by the example. Keep the same separators and row structure. One value, weight pair per line.

Weighted Average Calculator: a worked example

With the inputs below, the result is 86 (weighted average). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Values and weights80, 2; 90, 3
Weighted average86

Understanding the Weighted Average result

The main output is weighted average. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Weighted Average Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Check the base value, sample definition and chosen operation. Display rounding should come after the calculation.

For wider guidance, visit NIST statistical handbook. The formula and scope of this specific tool are stated on this page.

Weighted Average Calculator FAQs

What does Weighted Average Calculator calculate?

Weighted Average Calculator helps you find an average when each value carries a different weight. Its main output is weighted average.

What inputs do I need for Weighted Average Calculator?

You need values and weights. One value, weight pair per line.

Which formula does Weighted Average Calculator use?

Weighted average = sum(value × weight) ÷ sum(weights).

What is a worked example for Weighted Average Calculator?

Example inputs: Values and weights: 80, 2; 90, 3. The result is 86 (weighted average).

How should I enter values and weights?

Enter values and weights in the format shown by the example. Keep the same separators and row structure. One value, weight pair per line.

Why might the displayed result be rounded?

The result display limits decimal places to keep numbers readable. Very small values may use scientific notation. Keep extra precision during a manual calculation, then round the final answer for comparison.

How should I read weighted average?

The main output is weighted average. It applies to the inputs and operation you selected.

Why might my Weighted Average Calculator result differ from my records?

Check the base value, sample definition and chosen operation. Display rounding should come after the calculation. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Weighted Average Calculator?

Yes. Note your first weighted average, change values and weights or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Weighted Average Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.