How extra credit changes your grade

"Ten extra-credit points" is incomplete information. The effect depends on whether those points increase only the numerator, whether they also create a new assignment denominator, and whether a category cap applies.

Bonus points with no new denominator

A student has 430 points out of 500, or 86 percent. Ten pure bonus points produce:

Extra assignment with possible points

If the extra assignment is worth 10 earned points out of 10 possible points, both totals change:

Weighted category extra credit

When extra credit belongs to a category, first update that category average, then apply the category's course weight. A homework bonus inside a 20 percent category does not directly add the same number of points to the final course grade.

Caps and cutoffs

• A category may be capped at 100 percent.
• Bonus points may replace a dropped assignment rather than add to totals.
• Extra credit may be available only after required work is complete.
• The instructor may round after all bonuses are applied.

Measure the actual impact

Compare the course grade before and after the bonus, not only the number of extra points earned. Ten bonus points raised the points-only example by 2.00 percentage points, while a ten-out-of-ten extra assignment raised it by only 0.27. The same label therefore produced very different outcomes.

For a weighted category, report both the category increase and the final course increase. A five-point rise inside a 20 percent category moves the overall course grade by one point.