Although the percentage for a grade of B varies from one educational institution to another, the standard percentage scale for a B is from 80 to 89 percent. Each school, college or university determines the grade scale that appropriately defines the academic goals.
Many educational institutions divide the letter grade of B into plusses and minuses. For example, an 80 to 83 percent is often classified as a B minus, 84 to 86 percent is defined as a B and 87 to 89 is deemed a B plus. Some institutions use a weighted scale that varies within academic subjects, such as math, English or social sciences.