Free calculators that show their working
Plain Figures builds simple calculators for everyday numbers. Each one does a single job, shows the formula and the steps behind the answer, and cites its sources.
Calculators
- Semester Grade CalculatorCombine quarter or term grades with your exam, or find the exam score you need.
- Final Grade CalculatorFind the score you need on the final, or the course grade a final score gives you.
- Grade CalculatorWork out a class grade from weighted categories or from points.
- GPA CalculatorUnweighted 4.0 GPA from letter grades and credit hours.
- Weighted Average CalculatorWeighted average of any values and weights, with the working shown.
- Test Score Percentage CalculatorTurn a test score into a percentage and letter grade.
- Attendance Percentage CalculatorAttendance percent, days needed to reach a target, and days you can miss.
More calculators are on the way. Each one is added once it is finished and tested.
How these calculators work
Every calculator runs in your browser: nothing you type is sent anywhere. The math is tested automatically before each release, and each page explains how the result is worked out. Read more in the methodology.