How to compute a weighted average grade

1. Enter the items

   "Items (grade*weight per line)" expects one assessment per line in `grade*weight` form — `92*0.4` is a 92 worth 40% of the course, `78*0.2` is a 78 worth 20%. Whitespace around the asterisk is fine.

2. What the parser allows

   Grades and weights both accept decimals. Weights don't HAVE to sum to 1 — the tool divides by `sum(weights)` so `92*40` `78*20` works as well as `92*0.4` `78*0.2`. Lines without `*` or with NaN parse to 0.

3. Press Run

   Result returns a single `weightedAverage` = `Σ(grade × weight) / Σ(weight)`, rounded to 2 decimals. Empty input or weights summing to 0 throws "No valid items."

4. Forecasting your final grade

   To find what you need on the final to hit a target, plug in your current results plus a hypothetical `?*<finalWeight>` and solve for `?`. Or: rearrange — `targetAvg × Σw = Σ(known g × w) + needed × finalW`. Solve for `needed`.