About Weighted Average Calculator
In life and math, not everything is equal. A "Simple Average" (Mean) treats every number as having the same importance. A Weighted Average assigns a "weight" or importance level to each number. This concept is foundational in grading, finance, and statistical analysis.
Real World Applications
- Course Grading: A syllabus might say: "Homework 20%, Quizzes 30%, Final Exam 50%". You cannot just average the scores; you must apply the weights. A 100 on Homework is less valuable than a 100 on the Final.
- Stock Portfolios: If you own $1000 of Apple stock and $100 of Penny Stocks, your portfolio return is a weighted average. A 10% drop in Apple hurts far more than a 10% drop in the penny stock.
- Product Reviews: Some sites weight recent reviews higher than old ones to give a current score.
The Calculation
Weighted Mean = Sum(Value * Weight) / Sum(Weights). This ensures the result reflects the true "center of gravity" of the data.
How to Use
Enter pairs of values and their weights (e.g., Score: 90, Weight: 0.5). The weights can be percentages (0-100) or decimals (0-1), as long as you are consistent.