Combine editable numeric values or grades with explicitly selected decimal or percentage weights and inspect each normalized contribution.
01 / PURPOSE-SPECIFIC INPUTS
A positive total weight is required. Percentage totals other than 100% are explicitly normalized; no letter-grade or institution-specific policy is inferred.
Independent planning on a 0–100% grading scale. Remaining weight follows 100 − completed until edited. Course weights must total 100% within 0.00000001 percentage points; no normalization, letter grades, extra credit or institution-specific rules are assumed.
02 / RESULT & INTERACTIVE INSPECTION
Weights must be nonnegative with a positive total. Requested precision controls display only. Grade and percentage-weight modes are explicitly selected, not guessed from the entered numbers.
Row 1: value 80, entered weight 1; effective weight 1; share 25%; contribution 20. Total weighted mean 87.5.
| Row | Value | Entered weight | Effective weight | Share | Contribution to mean |
|---|---|---|---|---|---|
| 1 | 80 | 1 | 1 | 0.25 | 20 |
| 2 | 90 | 3 | 3 | 0.75 | 67.5 |
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The mean equals the sum of value times effective weight, divided by the positive effective-weight total. Each row also shows its normalized share and contribution to the final mean.
Combine editable numeric values or grades with explicitly selected decimal or percentage weights and inspect each normalized contribution. Inspect actual calculated quantities with accessible controls and review the worked unit conversions and assumptions.
Weighted Average Calculator calculates locally in browser memory. Entered circuit values, grades, temperatures and conductor measurements are not sent to a third-party processing service or stored as a personal profile. Ordinary page requests may still be logged. Clipboard access occurs only after choosing Copy Result.
The mean equals the sum of value times effective weight, divided by the positive effective-weight total. Each row also shows its normalized share and contribution to the final mean.
It means twenty percent, or effective weight 0.2; an optional percent sign is accepted. Decimal-weight mode instead means relative weight twenty and rejects percent-suffixed values, so the convention is never guessed.
No. The entered percentage total is shown explicitly. If it differs from 100%, contributions are normalized by the actual positive weight total and the result discloses that normalization.
Signed numeric values and zero weights are accepted, but weights cannot be negative and an all-zero weight total is undefined. A zero-weight row contributes zero without being silently removed from the breakdown.
Each contribution is value times its normalized share. Those contributions sum to the weighted mean across all rows; negative contributions extend left of zero. The optional original-value view is explicitly not a contribution sum.
No. It treats entered grades as numeric percentages from zero to one hundred and uses the selected weight convention. It does not infer institutional letter grades, missing-work rules or mandatory assessment policies. Compensated floating sums and display precision remain approximate numerical arithmetic.