Weighted grade calculator

A weighted average multiplies each score by its weight, adds them up, and divides by the total weight:

Example: homework 92% (worth 20%), midterm 78% (worth 30%), final 85% (worth 50%).

A simple average of the three scores would be 85%, but the midterm counts for more than homework, so the weighted grade is lower.

Leave out anything without a score. The calculator divides by the weights you have entered, so the result is your current grade. In the example, with only homework and the midterm marked: $(92 \times 20 + 78 \times 30) \div 50 = 83.6\%$. To find what you need on the remaining work, use the final grade calculator.

Some teachers weight by points: tests out of 100 and quizzes out of 20. Then you don't need weights at all: add up all the points you earned and divide by all the points possible. If your course mixes both (categories with percentages, and points within each category), work out each category's percentage first, then weight the categories.

The weights tell you where effort pays off most. A 10-point gain on a test worth 50% raises your grade by 5 points; the same gain on homework worth 10% raises it by only 1. That doesn't mean skipping homework, which is usually where you learn the material for the tests, but it does help you plan revision before a heavily weighted exam.

• Averaging the scores without the weights.
• Entering a weight of 0.2 for one item and 30 for another. Use the same kind of number for all of them (all percentages, or all decimals).
• Mixing up points and percentages: convert raw scores to percentages first.