School & Math Calculators
Use free calculators for test scores, fractions, percentages and everyday school math. Each tool shows the answer and explains how the calculation works.
- Test Score CalculatorCalculate your percentage grade, letter grade and questions you can miss.Correct ÷ Total × 100
- Mixed Fraction to PercentConvert a mixed fraction into a decimal and a percentage.(A × C + B) ÷ C × 100
- What Percent Is X of YFind what percentage one value is of another.X ÷ Y × 100
- What Is X% of YFind a percentage of a known number.X × Y ÷ 100
- Reverse Percentage — X Is Y% of WhatFind the original whole when you know the part and percentage.X ÷ (Y ÷ 100)
- Percent ChangeFind the percentage increase or decrease between two values.(Y − X) ÷ X × 100
Built for Coursework and Homework
Grades are percentages in disguise. The Test Score Calculator turns correct answers out of a total into a percentage and a letter grade, and tells you how many more questions you can miss and still hold an A, B or C.
Homework often asks the same question in a different form. Converting a mixed fraction to a percent is the same arithmetic as finding what percent X is of Y, and working backwards from a mark to the total uses the Reverse Percentage Calculator. Every page numbers the steps with your own values, so you can copy the method rather than just the answer.
Keeping track of your marks over a term? The My Test Scores dashboard stores them privately in your browser.