On the grade calculator, type what you earned, points possible when you have them, and the weight. Leave points possible blank when the earned value is already a percent. A letter such as B is read as a percent.
The grade page shows the course percent, the letter on the 93-scale, and the arithmetic. Add a target percent and the remaining weight to see the score you still need, including when that score is over 100.
On the percentage calculator, choose one question. You can ask what a percent of a number is, what percent one number is of another, the signed change from one number to another, or what you get after adding or removing a percent. Each result includes the arithmetic.