Education Calculators
Tools for students and study planning. Work out your weighted GPA on the 4.0 scale and more, with results that update as you type.
GPA Calculator
Calculate your weighted GPA on the 4.0 scale from each course's credits and letter grade.
Open calculator Plot No. 54 · EducationFinal Grade Calculator
Find the score you need on your final exam to reach the overall grade you want.
Open calculator Plot No. 55 · EducationGrade Calculator
Convert points earned out of points possible into a percentage and letter grade.
Open calculator Plot No. 56 · EducationAverage Calculator
Find the mean, median, mode, range, sum, count, min and max of a list of numbers.
Open calculator Plot No. 57 · EducationRatio Calculator
Simplify a ratio to its lowest terms and solve a proportion A:B = C:x for the missing value.
Open calculator Plot No. 58 · EducationFraction Calculator
Add, subtract, multiply or divide two fractions and get the answer in lowest terms plus a decimal.
Open calculator Plot No. 59 · EducationStandard Deviation Calculator
Get the mean, variance and both population and sample standard deviation from a list of numbers.
Open calculator Plot No. 60 · EducationCircle Calculator
Find a circle's area, circumference and diameter from its radius or diameter.
Open calculator Plot No. 61 · EducationPythagorean Theorem Calculator
Find the hypotenuse or a missing leg of a right triangle using a squared plus b squared equals c squared.
Open calculatorWhich education calculator do you need?
Grades first, then the coursework arithmetic.
| What you want to do | Calculator | What it gives you |
|---|---|---|
| Work out a weighted GPA across several courses | GPA Calculator | GPA on the 4.0 scale, with total credits and grade points |
| Find the mark needed on a final exam | Final Grade Calculator | The exam score required to reach your target overall grade |
| Turn marks into a percentage and a letter | Grade Calculator | The percentage from marks earned and available, plus the letter band |
| Average a set of numbers | Average Calculator | Mean, median, mode, range and the count |
| Measure how spread out a data set is | Standard Deviation Calculator | Sample and population standard deviation, variance and mean |
| Simplify, split or scale a ratio | Ratio Calculator | The simplified ratio and each share of a total |
| Add, subtract, multiply or divide fractions | Fraction Calculator | The result in lowest terms, plus its decimal equivalent |
| Find a circle's area, circumference or radius | Circle Calculator | Every other circle measure from any one of them |
| Solve a right-angled triangle | Pythagorean Theorem Calculator | The missing side from the other two, with the equation it solved |
What the education calculators do
This plot covers two kinds of student maths. The first is grades: a weighted GPA on the 4.0 scale, the mark you need on a final to reach a target, and a straight percentage from marks earned over marks available. The second is the arithmetic that turns up constantly in coursework, which is averages and spread, ratios, fractions, circle geometry and the Pythagorean theorem.
The grade tools are built around the way credit weighting actually works, which is the part students get wrong. A GPA is not the average of your grades; it is the total grade points weighted by the credits each course carries, divided by the total credits. A four-credit course therefore moves your GPA more than a three-credit one, and the final grade calculator applies the same logic to the weighting of an exam against coursework already banked.
The maths tools are built to be checked rather than trusted. The standard deviation calculator returns the sample and population figures side by side instead of silently picking one, which is the distinction coursework marks you on. The Pythagorean calculator prints the equation it solved underneath the answer. And both it and the circle calculator run in reverse, so you can go from an area back to a radius, or from a hypotenuse and one leg back to the missing side.
The 4.0 grade point scale
These are the grade points the GPA calculator assigns to each letter. Grade points for a course are the letter's value multiplied by that course's credits, which is why the third column matters more than the second when you are predicting your GPA.
| Letter | Grade points | Points from a 3-credit course |
|---|---|---|
| A | 4.0 | 12.0 |
| A- | 3.7 | 11.1 |
| B+ | 3.3 | 9.9 |
| B | 3.0 | 9.0 |
| B- | 2.7 | 8.1 |
| C+ | 2.3 | 6.9 |
| C | 2.0 | 6.0 |
| C- | 1.7 | 5.1 |
| D+ | 1.3 | 3.9 |
| D | 1.0 | 3.0 |
| F | 0.0 | 0.0 |
GPA is the sum of all grade points divided by the sum of all credits. This is the unweighted 4.0 scale; schools that add weight for honours or advanced courses push the top of the scale above 4.0, and institutions vary on whether a plus or minus is recognised at all. UK universities do not use GPA, awarding degree classifications instead, so check what your own institution publishes before treating a number here as official.
Education guides
Best free fraction calculator (no signup)
Which free fraction calculator to use, with an honest table comparing Calc Garden, Calculator.net, CalculatorSoup and Mathway on mixed numbers, step-by-step working and live results.
Free alternative to the Calculator.net GPA calculator
Work out a weighted GPA on the 4.0 scale from your course grades and credit hours. Free GPA guide and calculator.
What Grade Do I Need on My Final Exam?
Work out the exact mark you need on your final exam with one formula, three worked examples, and a quick way to find the final's weight.
Population vs Sample Standard Deviation
When to divide by N versus n minus 1 for standard deviation, why Bessel's correction matters, a worked example, and STDEV.P vs STDEV.S.
Browse every Calc Garden guide.
Frequently asked questions
Why is my GPA not the average of my grades?
Because credits weight it. Each course contributes its grade points multiplied by its credits, and the total is divided by total credits. An A in a four-credit course therefore pulls harder than an A in a two-credit one, so two students with identical letter grades can end up with different GPAs.
Which standard deviation should I use, sample or population?
Use the population formula only when your numbers are the entire group you care about. Use the sample formula, which divides by one less than the count, when the numbers are a sample you are generalising from. Coursework usually wants the sample version, and the calculator shows both so you can hand in the right one.
Can I use the final grade calculator if my coursework is not finished?
Yes. Enter the grade you have banked so far, the weight the final exam carries and the overall grade you are aiming for, and it returns the exam score you need. Everything that is not the exam is treated as already marked, so if some coursework is still outstanding, fold it into your current grade as an estimate and rerun it when the real mark lands.