37 out of 50 is equivalent to a 74% percentage grade. To calculate this percentage, you can divide 37 by 50 to get 0.74, then multiply by 100 to get 74%. Alternatively, you can think of 37 out of 50 as a fraction and convert it to a percentage. To do this, you can first divide 37 by 50 to get 0.74, then multiply by 100 to get 74%. Therefore, 37 out of 50 is equivalent to a 74% percentage grade.