Weighted Average Calculator
Frequently Asked Questions
What is the difference between a weighted average and a simple average?
A simple average treats every value equally, while a weighted average assigns each value a weight representing its importance. For example, a final exam worth 60% of a grade affects the course average more than a quiz worth 10%. Whenever values contribute unequally, a weighted average produces a more accurate result.
Do my weights need to add up to 100?
No. The weighted average formula divides the sum of (value × weight) by the total sum of all weights, so any consistent scale works. Weights of 1, 2, 3 give identical results to weights of 33, 67, 100. Only the relative proportions between weights matter, not their absolute values or whether they sum to 100.
How do I calculate a weighted GPA using this calculator?
Enter each course grade as the value (using your school's grade-point scale, e.g. A = 4.0) and the number of credit hours as the weight. Add one row per course. The calculator computes your semester or cumulative GPA instantly. Verify your school's exact grade-point scale before entering values.
Can I use percentage weights like 40%, 25%, 20%, 15%?
Yes. Enter them as 40, 25, 20, and 15. Since they sum to 100, the denominator will be 100 and the result is already expressed on the same scale as your values. Entering them as decimals (0.40, 0.25, 0.20, 0.15) produces the same answer — the formula is scale-independent.
What happens if I enter zero as a weight?
A weight of zero effectively excludes that value from the calculation — it adds nothing to the numerator and nothing to the denominator. This is mathematically valid and useful when you want to document an entry in your dataset while intentionally giving it no influence on the final weighted average result.
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