Weighted Average Calculator
Calculate a general weighted average from a list of values and matching weights, with totals and unweighted mean for comparison.
Calculate Weighted Average
Calculate a general weighted average from a list of values and matching weights, with totals and unweighted mean for comparison.
What This Weighted Average Calculator Calculates
A weighted average gives some observations more influence than others. That makes it useful for combining quantities that represent different volumes, frequencies, probabilities, credit hours, or importance levels. This calculator multiplies each value by its matching weight, adds those weighted contributions, and divides by the total weight. It also shows the ordinary mean so you can see how weighting changed the result. The calculation is completed locally in the browser, and the calculator itself does not require an account or send the entered values to OfficeCalculator.Net for server-side calculation.
Formula and Method
Weighted average = Σ(value × weight) ÷ Σ(weights).
The result is calculated from the values currently shown in the form. Supporting figures are included so you can inspect the intermediate meaning of the answer rather than relying on an unexplained single number.
How to Use the Calculator
- Enter the requested date, time, score, data values, or planning assumptions using the labels shown beside each field.
- Keep related inputs on the same basis. For example, pair values with their matching weights and use the weekend or time-zone convention that actually applies.
- Select Calculate and review both the main result and the supporting figures.
- Read the interpretation and limitations below before using the result in a real workflow.
- Use Copy Result, Share Result, or Save Result Image when you need a record of the calculation.
Worked Example
Values of 70, 80, and 90 with weights of 1, 2, and 3 produce a weighted average closer to 90 because the largest value has the greatest weight. The calculation uses 70×1 + 80×2 + 90×3 divided by the total weight of 6.
Common Uses
- Combine prices or rates with different quantities.
- Average measurements where observations have different reliability or frequency.
- Calculate a grade-like or index-like measure when components have unequal influence.
How to Interpret the Result
A weighted average usually lies between the smallest and largest entered values when all weights are non-negative. Increasing a value's weight pulls the result toward that value. The total weight is reported as a check; multiplying every weight by the same constant does not change the normalized weighted average.
For repeat calculations, change one assumption at a time and compare the supporting figures. That makes it easier to identify which input is driving the result and reduces the chance of carrying an incorrect unit, date convention, or percentage basis into a decision.
Important Notes and Limitations
Weights should represent a meaningful basis for influence. Mixing incompatible units or choosing arbitrary weights can produce a mathematically valid number that has little practical meaning. Negative weights are intentionally not accepted in this general-purpose tool. For specialized statistical models, use the weighting method defined by that field rather than assuming a simple weighted mean is appropriate.
OfficeCalculator.Net provides this tool for planning, checking, learning, and general informational use. Keep source records and official system outputs when a result affects grades, payroll, contractual service levels, formal reports, or another decision that must be verified independently.
Frequently Asked Questions
Do weights have to add to 1 or 100?
No. Any positive proportional scale works because the calculator divides by the total weight.
Can some weights be zero?
Yes. A zero-weight item has no effect on the result.
Is a weighted average always different from the ordinary average?
No. They are the same when all observations have equal weights, and can also coincide by chance.
Common Search Questions About Weighted Average Calculator
How do I calculate weighted average?
Use the calculator on this page and enter the requested values. Calculate a general weighted average from a list of values and matching weights, with totals and unweighted mean for comparison.
How can I get the weighted average result quickly?
Enter the required values, calculate, and review the result together with its supporting figures. On rebuilt mobile calculators, the answer is brought into the current viewport so the result is easy to find.
What values do I need to calculate weighted average?
Use the inputs shown in the calculator form and keep units consistent. For important decisions, use measured or verified values and review the page assumptions before relying on the result.