About Weighted Average Calculator
A weighted average gives different entries different amounts of influence.
Calculate a weighted mean from values and their weights. Use this page alongside your notes to check the process, then change the inputs to explore a different example.
How to use Weighted Average Calculator
- Review the input labels and replace the sample values with your own details.
- Check the units, options and any grading rules. The method below explains this tool’s assumptions.
- Use the action button to generate your result. Review it before copying, downloading or printing.
Method and assumptions
Weighted mean = Σ(value × weight) ÷ Σweights. Enter one numeric pair per line; values may be negative and weights must be nonnegative. At least one weight must be positive. Example: 80 at weight 2 and 90 at weight 3 gives 86. Weights do not need to total 100.
Worked example
80 with weight 2 and 90 with weight 3 give (160+270)/5 = 86.
Enter this example above, then change one input and compare the result. This helps you see which part of the method responds to the change.
Understanding your result
Read the main answer first, then review any supporting values, units or messages. An input warning means you should correct the relevant field and run the tool again.
For a useful comparison, change one input at a time and record both results. Avoid rounding intermediate values when checking calculations by hand.
Tips and common mistakes
- Weights must be nonnegative and at least one must be positive.
- Recheck the example and input format if a result is unexpected.
- Keep a downloaded copy of work you want to reuse. Reloading the page resets your session.
Frequently asked questions
Must weights be percentages?
No. Any consistent relative weights work.
Do I need an account?
No. Use the tool directly in your browser. Inputs are kept in the current page session, so download useful work before leaving.
Can I save or print my result?
Use Copy result, Download text or Print at the bottom of Your Result. Flashcards and quizzes export their source content for reuse; citations export your edited text.